P. Samoila

• PhD
• Petru Poni Institute of Macromolecular Chemistry

The development of botanical biofilters in the light of climate change issues, which can couple the advantage of C-capture from polluted air with their waste biomass valorization, is emerging. This paper evaluates the changes in physical-chemical-biological profile of aerial plants involved in such biosystems, for highlighting their functionality i...

This paper describes a process to obtain magnetite functionalized with carboxymethylcellulose via coprecipitation by means of a preliminary stabilization of magnetite in citric acid. The magnetite assemblies successfully passed in vitro and in vivo tests of bio-compatibility. The measured values for the dielectric loss factor are remarkably high, a...

Plastic pollution has escalated into a critical global issue, with production soaring from 2 million metric tons in 1950 to 400.3 million metric tons in 2022. The packaging industry alone accounts for nearly 44% of this production, predominantly utilizing polyethylene terephthalate (PET). Alarmingly, over 90% of the approximately 1 million PET bott...

This study reports a simple and low-cost method for water purification using recyclable natural fibers (coarse wool fibers) as column-filling media for adsorption in the dynamic mode. As an instance of a dissolved organic pollutant, a cationic dye (basic blue 9, BB9) was assayed. According to the Langmuir isotherm (recorded at 300 K), the calculate...

Hydrogen peroxide is a compound that plays an important role in the biochemical processes of living organisms and found in a large spectrum of applications from chemistry and soft material processing to cosmetics and medicine. It is present in natural waters and contributes to their purification through reactive radical species. Starting from these...

This study reports the valorization of pistachio shell agricultural waste, aiming to develop an eco-friendly and cost-effective biosorbent for cationic brilliant green (BG) dye adsorption from aqueous media. Pistachio shells were mercerized in an alkaline environment, resulting in the treated adsorbent (PSNaOH). The morphological and structural fea...

Woody lignocellulosic biomasses comprise the non-edible parts of fruit trees. In recent years, the exploitation of this biomass has been widening in order to mitigate environmental issues. At the same time, this waste could be transformed into a value-added product (active carbon by pyrolysis, isolation of nanocellulose, oils or proteins). For eith...

In this work, stabilized ionotropic hydrogels were designed using sodium carboxymethyl cellulose (CMC) and assessed as inexpensive sorbents for hazardous chemicals (e.g., Methylene Blue, MB) from contaminated wastewaters. In order to increase the adsorption capacity of the hydrogelated matrix and facilitate its magnetic separation from aqueous solu...

Neodymium (Nd)-doped ZnO nanostructures with different amounts of Nd were obtained by the electrospinning–calcination method. X-ray diffraction measurements indicated that the prepared nanostructures have a wurtzite structure without undesirable impurities. Nd doping changes the mean crystallite size as well the lattice strain, as proved by William...

Herein, we report the results of a study on combining adsorption and ultrafiltration in a single-stage process to remove nitrite ions from contaminated water. As adsorbent, a surface-modified nanoclay was employed (i.e., Nanomer® I.28E, containing 25–30 wt. % trimethyl stearyl ammonium). Ultrafiltration experiments were conducted using porous polym...

Herein, we report the performance of some low-cost biosorbents developed by environment-friendly modification of walnut shells. Two types of biosorbents were prepared by ecological modification of walnut shell surfaces: (1) biosorbents obtained by hot water treatment (WSH2O) and (2) biosorbents produced by mercerization (WSNaOH). Different techniqu...

Huge amounts of vegetable waste, mainly resulting from the food industry, need large areas for storage, as they could cause hazardous environmental impact, leading to soil and water pollution or to CO2 emissions during accidental incineration. This work was aimed at recycling certain lignocellulosic waste (walnut shells, kernels of peach, apricot,...

ZnAlFe1−xSmxO4 (x = 0, 0.02, 0.04, 0.06, 0.08) spinel ferrites were successfully obtained for the first time via a sol–gel autocombustion technique using citric acid as the combustion/chelating agent. These materials were then employed as photocatalysts for the degradation of Evans Blue, considered herein as a model organic pollutant. The XRD and F...

A series of tin (Sn)-doped titania (TiO2) composites were prepared by electrospinning and then calcined at 500 °C, 600 °C, and 700 °C temperatures. The morpho-structural and optical properties of the resulting composites were assesed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), diffuse refl...

Herein, we report a new approach for the sulfonation of polyether ether ketone (PEEK) following a shorter path of reaction undertaken at 60 °C under ultrasonication. The application of this method enabled the reduction of the reaction time from several hours to less than one hour, achieving a relevant sulfonation degree. The sulfonated-PEEK (SPEEK)...

Eliminating or at least lessening the pain is a crucial aspect of burns management, as pain can negatively affect mental health and quality of life, and it can also induce a delay on wound healing. In this context, new amphiphilic chitosan 3D porous membranes were developed and investigated as burns therapeutic systems with analgesic effect for del...

New composite membranes based on PVDF fibers loaded with Sm doped TiO2 (TiO2:Sm) nanostructures and graphene-based nanoparticles obtained by the electrospinning technique are reported. The addition of the inorganic nanostructures induced photocatalytic properties, while the graphene-based nanoparticles (G - graphene or GO - graphene oxide) improved...

Fluorescence detection is currently one of the commonly used techniques worldwide. Through this work, the preparation and optical properties of an interesting composite material are discussed. It is shown that encapsulating cobalt spinel ferrite (CoFe2O4), obtained by the sol-gel autocombustion method, into poly[diphenyl-co-methyl(H)]silane matrix...

Nowadays, very coarse wool fibers are considered waste biomass and are discarded at random or burned. Therefore, it is of actual interest to valorize coarse wool fibers as utile products. In this sense, we report herein an environmentally-friendly process for the preparation of a new material based on oxidized wool fibers and designed for efficient...

To avoid fungal spreading in the bloodstream and internal organs, many research efforts concentrate on finding appropriate candidiasis treatment from the initial stage. This paper proposes chitosan-based physically or chemically cross-linked hydrogels aimed to provide sustained release of micronized nystatin (NYSm) antifungal drug, known for its la...

Titanium dioxide (TiO2)-based nanofibers doped with samarium (Sm³⁺) and erbium (Er³⁺) at doping levels tuned in the range of 0.05–1.0% were prepared by the electrospinning-calcination method. The produced materials were well characterized by X-ray diffraction, SEM, EDX, and UV–vis diffuse reflectance spectroscopy. These one-dimensional nanostructur...

CoFe2O4 and NiFe2O4 spinel ferrites were obtained by microwave-assisted sol–gel combustion synthesis using three different types of chelating/combustion agents: maleic acid, citric acid, and urea. The nanomaterials produced were characterized from the structural, morphological, textural, and magnetic viewpoints. The spinel ferrites prepared were em...

We report herein the synthesis and characterization of a new nanostructured composite (Wool-$\text{Fe}_3\text{O}_4$-Polysiloxane) aimed to be applied as a magnetic adsorbent for oil spill cleanup. The synthesized composite was characterized by the physical–chemical instrumental techniques (XRD, FTIR, SEM-EDX, and VSM). The hysteresis loops from the...

The nontoxicity, worldwide availability and low production cost of cuttlefish bone products qualify them an excellent biocoagulant to treat food industry wastewater. In this study, cuttlefish bone liquid waste from the deproteinization step was used as a biocoagulant to treat food industry wastewater. This work concerns a waste that has never befor...

The paper deals with new approaches to chitosan (CS)-based antifungal therapeutic formulations designed to fulfill the requirements of specific applications. Gel-like formulations were prepared by mixing CS dissolved in aqueous lactic acid (LA) solution with nystatin (NYS) powder and/or propolis (PRO) aqueous solution dispersed in glycerin, followe...

As a response to the everyday growing concern about wastewater treatment, some new mesoporous TiO2/ZnFe2O4 and TiO2/ZnFe1.98La0.02O4 catalysts were synthesized during this research. The ultrasound template-assisted sol-gel method was employed in the synthesis, using conventional calcination and microwave treatment for pore directing agent removal....

The pure TiO2 and lanthanum (La³⁺)-doped titanium dioxide (TiO2) nanofibers were synthesized by electrospinning method followed via calcination at different temperatures (from 400 °C to 700 °C). Structures of the nanofibers were characterized by X-ray diffraction, scanning electron microscopy, TEM images and diffuse reflectance spectroscopy. The si...

This is the first-time report on the optimization of pure TiO2 and Cu/TiO2 nanocomposite photocatalytic fibrous materials fabricated by electrospinning followed by removal of the organic components by calcination at high temperature. Morphological investigations of the fabricated nanocomposites performed using scanning electron microscopy (SEM) and...

Aggregation of various fluorophores is a useful approach to build highly sensitive and selective fluorescent sensors. In this work, the ability of oligomeric polydiphenylsilanes to associate with fluorescent low molecular weight organic compound is illustrated by the formation of stable aggregates between poly[diphenyl-co-methyl(H)]silane and diben...

Alginate-based composites with appropriate characteristics as polymer-electrolyte membranes (PEMs) were prepared by blending the polysaccharide with poly(vinylsulfonic acid), reinforcing with inorganic fillers such as TiO2 or NiFe2O4, and cross-linking with Ca²⁺ or Ba²⁺. The obtained membranes were studied from the structural and morphological poin...

The study reported herein describes a chemometric approach, based on an artificial neural network (ANN), to predict the adsorption performance of a new hybrid material. This composite adsorbent with magnetic properties (magsorbent) consists of a cross-linked alginate matrix that incorporates inorganic nanoparticles of cobalt ferrite. Instrumental p...

New hybrid materials based on lanthanide doped ZnO nanoparticles (Ln=Sm,La,Er) reinforced in PVDF membranes were prepared by electrospinning method, materials that have not been reported so far. Photocatalysts with 22% and 37% content of inorganic nanostructures for degradation of some organic dyes (Methylene Blue (MB) and Rhodamine B (RhB)) under...

A higly stable fluorescent probe for the selective detection of cytosine is reported. The probe is based on a polyhydrosilane copolymer, onto which pendant 2-{4-[(4-formylphenoxy)methyl]phenyl}ethyl moieties were grafted. The appendage of these moieties to poly[methyl(H)-diphenyl]silane was accomplished in two steps, namely hydrosilylation of a pol...

Oil spills have provoked negative environmental impacts for decades. To combat such accidental pollutions, the exploiting of the low-cost sorbents is of real interest. We report herein the valorization of coarse grade wool fibers (biomass waste) as sorbents for the uptake of oily products. Response surface methodology was employed for modeling and...

Up-to-date no study was reported dealing with cobalt ferrite-based catalysts for wet hydrogen peroxide oxidation (CWPO) of organic pollutants. In this respect, degradation of Rhodamine 6G-(Rh6G) was assessed by cobalt ferrites doped with lanthanum, gadolinium and dysprosium cations, for the first time. The ED-XRF proved the stoichiometry of catalys...

Arthrospira platensis is featured as a promising microalgae candidate for the development of the biosystems for air revitalisation in spacecrafts and life support in space. An enhanced configuration of a sparged type photobioreactor (PBR), containing 5 L of A. platensis culture, which was equipped with an external LED lighting tube around the react...

Porous titania was successfully synthesized by an ultrasound-assisted sol-gel route. The synthesis process was empirically modeled and optimized using the response surface methodology (RSM). Input variables adopted for optimization dealt with the weight ratio of precursors (r) and the sonication time (t), representing the used factors in the synthe...

Chitosan-sulfated titania composite membranes were prepared, characterized, and evaluated for potential application as polymer electrolyte membranes. To improve the chemical stability, the membranes were cross-linked using sulfuric acid, pentasodium triphosphate, and epoxy-terminated polydimethylsiloxane. Differences in membranes’ structure, thickn...

ZnO loaded with Ag nanostructured materials in different atomic concentrations (0.1, 0.5, 1 and 2%) were obtained using electrospinning method. Electrospun solutions used in the manufacture of these fibers before calcination contain a mixture composed of a polymer (polyvinylpyrrolidone), zinc acetate and various ratios of Ag nitrate. The materials...

Sol–gel synthesis of mesoporous titania–silicas with the structure related to Type MCM-41 is carried out. The method of nitrogen adsorption has established influence of fluoride-anion on the adsorptive and catalytic properties of titania–silica. The pore structure in titania–silica is in the form of an hexagonal array of uniform tubular channels. A...

The interest in developing new and more efficient materials and technologies for the removal of different pollutants from wastewater is constantly growing. This chapter reviews chitin and chitosan, together with their derivatives and composites, from the perspective of water purification applications, underlining their advantages for the removal of...

This study presents an introduction in air revitalisation practice by using a microalgae-based biosystem. Althrough the study is developed in the light of space applications, it opens new horisons for implementing such systems for terrestrial applications as well, where biotechnologies for addressing climate change and other issues associated with...

This study presents an introduction in air revitalisation practice by using a microalgae-based biosystem. Although the study is developed in the light of space applications, it opens new horizons for implementing such systems for terrestrial applications as well, where biotechnologies for addressing climate change and other issues associated with a...

The paper reports on the preparation of polysiloxane hydrophobized viscose-maghemite/goethite magnetic composite with properties appropriate for uses in oil spill sorption from polluted aqueous media. A multi-step procedure was employed to obtain the polymeric composite. The structures of the prepared samples and precursors were analyzed by Fourier...

Ceramic nanostructures of ZnO doped with La³⁺ ions (0.02%, 1%, 2% and 4%) were prepared by electrospinning-calcination method. Polyvinylpyrrolidone (PVP) was used as an additional polymer to promote the electrospinning. And, the intermediate electrospun products were processed thermically at 700 °C for 3 h. The produced materials were characterized...

A viable option for dehumidification of air stream moisture in closed environments is the use of super adsorbent materials with high capacity for water retention. Selective transport of water molecules across porous materials makes it possible to reduce the humidity of an air stream. The use of such materials has advantage over many commercially av...

Synthesis and characterization of novel ZnO:RE nanostructured materials doped with 1% rare-earth elements (RE=La, Er, Sm) and their testing for photocatalytic applications were reported. The materials were obtained via electrospining, followed by calcination at 700 °C. The samples were characterized in terms of surface morphology (SEM, TEM), crysta...

Indoor environments are prone to CO2 accumulation, which is known to affect the comfort parameters. In this study, CO2 uptake by microalgae in a 2L sparged reactor processing air from indoor environment is evaluated in order to provide starting benchmarks for further biosystem development in the light of a specific environmental application related...

Herein, we report a new composite magnetic-adsorbent made of doped spinel ferrite (15%) dispersed throughout a matrix of chitosan (CS) cross-linked with glutaraldehyde (GA). The composite material was well characterized by using instrumental methods of physical-chemical analysis (SEM, EDX, FTIR and VSM). The produced adsorbent was applied for the r...

Oil spill accidents and oily wastewaters induce a negative impact to the environment and human health. Therefore, the developing of new sorbent materials to combat promptly such type of pollution is of great interest. In this work, poly(vinylidene fluoride) and polysulfone ultrathin fibers reinforced with Halloysite nanoclay and CoFe2O4 were develo...

This paper reports a data-driven modeling methodology undertaken to establish the optimal formulation of NiFe2O4@Ca-alginate composite designed for adsorption applications. Adsorbents were produced as anisotropic plate-like particles that were applied for removal of Rhodamine-6G (Rh6G) and Methylene Blue (MB) cationic dyes from aqueous solutions. D...

The spinel ferrite CoFe1.98Sm0.02O4, prepared by sol-gel autocombustion technique using maleic acid as combustion agent, was successfully functionalized with chitosan (CS) and epichlorohydrine (ECH). The insertion of the samarium cations into the spinel matrix was proved by X-ray diffraction and Fourier transform infrared analyses. Likewise, the sp...

The paper highlights the efficiency of ultrasonication, as a clean and energy-saving method for the preparation of cellulose-iron oxide ferromagnetic composites in two steps. Hydroxyl-functionalized maghemite-goethite nanoparticles (MG) having a saturation magnetization of 56.9 emu/g at room temperature were first synthesized in an one-pot procedur...

In the past years, an important problem that requires solutions at the global scale is the environmental pollution. This work describes a possible approach toward finding such solutions based on nanophotocatalysts with improved activity. Thus, the present study reports a new and efficient synthesis procedure for titania–zinc ferrite nanocomposite w...

Barium titanate submicronic particles were prepared, for the first time, by a solid-state reaction route, where the classical ball grinding/mixing and drying steps were replaced by ultrasonication and microwave assisted processes, respectively, resulting in significant reduction in both drying duration and temperature of the thermal treatment. The...

Maghemite (γ-Fe 2 O 3)/goethite (α-FeOOH) composite nanometric particles were prepared through an one-pot synthesis protocol, involving a chemical precipitation process performed under ultrasonication of iron sulfate in an aqueous basic solution. As proved by infrared spectroscopy, X-ray diffraction and electronic microscopy, the resulted ferromagn...

NiFe1.98RE0.02O4 (where RE = La, Sm, Gd and Dy) spinel ferrites were synthesized by sol–gel autocombustion method using maleic acid as fuel. The effect of rare-earth cations (RE) doping on structural, magnetic and catalytic properties of nickel ferrite is reported. XRD and FT-IR analysis revealed the successful insertion of the rare-earth cations i...

This paper reports on the hydrophobization of polyester fibrous nonwoven with poly(methylhydro-dimethyl)siloxane copolymers in order to produce water-repellent sorbents for oil spill cleanup. Polysiloxane copolymers were first synthesized and characterized prior to be used as hydrophobization agents. The produced hydrophobic sorbents were character...

In this work, pure polyvinylidene fluoride (PVDF) and PVDF/cobalt ferrite (CoFe2O4) magnetic fibrous composite were successfully prepared by electrospinning method for oil spill sorption applications. The pure spinel phase of CoFe2O4 and PVDF/CoFe2O4 composites were confirmed by X-ray diffraction analysis (XRD). Electrospun sorbent materials were c...

The main objective of this work was to investigate the influence of the order of component synthesis of zinc ferrite–titania nanocomposites on their structural, morphologic, textural, light absorption properties, and performances as photocatalysts. In this respect, nanocomposite materials with 10ZnFe2O490TiO2 (wt %) composition were prepared via a...

This paper is concerned with the design of the electrospinning process to produce efficient polysulfone fibrous sorbents for oil spill cleanup. To this end, a full factorial experimental design was adopted, and consequently two multiple regression models were developed to predict oil sorption capacities of resulting materials. The optimal electrosp...

Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF), a material which can be used for the fabrication of oxygen membranes with developed surfaces, was synthesized by a solid state method. The most important material properties which have influence on the oxygen membrane usability were investigated. An innovative fabrication technology was developed for the preparation...

Magnetic chitosan – zinc ferrite composites (ChZnF) were proposed as potential adsorbents due to their appropriate physical characteristics and facile separation under external magnetic fields. The magnetic component (ZnFe2O4) was prepared by sol-gel autocombustion method which yields nanometric spinel compounds with narrow size distribution and wi...

Two novel mononuclear zinc(II) and copper(II) complexes of tetradentate N2O2 Schiff base ligands generated in situ by the template method were synthesized by the reaction of salicylicaldehyde and o-vanillin, respectively, with 1,3-bis(3-aminopropyl)tetramethyldisiloxane and the corresponding metal salts, in the presence of pyridine. The structures...

Catalysts based on nanocrystalline Mg-Zn ferrites supported on commercial alumina were prepared by in situ sol-gel autocombustion technique. The as-obtained materials were characterized using Fourier Transform Infrared Spectroscopy (FT-IR), Xray diffraction (XRD), atomic force microscopy (AFM) and Brunauer-Emmett-Teller (BET) specific surface area...

Nanosized spinel ferrites MFe2O4 (M = Ni, Co, and Zn) have been prepared by sol-gel autocombustion method using citric acid as a fuel agent. The materials are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). The spinel ferrites have been applied for Congo-Red (CR)...

The possible recovery of three microelements contained in the sludges resulted after chemical leaching of uranyl ions from uranium ores was investigated, using four types of zeolites as adsorbents. The variation of the retention degree in time of 3 cations: Fe3+, Ti4+and Ni2+, adsorbed on: ETS-10, ETS-4, ZSM-5 and mordenite was followed. The charac...

In this study the photodegradation of aqueous solution of recalcitrant organic pollutant Orange I was investigated by using chromium substituted zinc ferrite, ZnFe2−xCrxO4 (x = 0, 0.25, 0.5, 1.0, 1.50, 2.0) catalysts, for the first time, under both UV and visible light irradiation. The photocatalytic process was promoted when Fe3+ cations were subs...

For the synthesis of Ca2XBiO6 (X = Dy, Fe, Al) metal oxides with ordered double-perovskite structure, the sol-gel auto-combustion method has been used for the first time. The synthesis progress was followed by the Fourier transform infrared spectroscopy and the samples structure was investigated by X-ray diffraction. The samples morphology was stud...

Double perovskite metal oxides with formula A2DyBiO6 (A = Mg, Ca, Sr, Ba) were synthesised by a sol–gel auto-combustion method, using citric acid as the combustion agent. The effects of A-site cation on the structure, morphology, and dielectric properties were examined. The synthesis was monitored using Fourier transform infrared spectroscopy (FTIR...

The synthesis and characterization of seven nanostructured NiFe2O4 ferrite samples with spinel type structure were studied. The samples were synthesized by the sol–gel autocombustion method, using cellulose, a cellulose–citric acid mixture, hexamethylenetetramine, citric acid, tartaric acid, glycine and urea as chelating/fuel agents. For the first...

Pt, Ir and Rh were deposited on SiO2 or Al2O3 using chlorinated precursors and various amounts of HCl in the impregnation medium. The Brønsted and Lewis acidities increased with the chlorine content of the alumina supported catalysts. The silica-supported catalysts only presented Lewis acid sites. The catalysts were evaluated in methylcyclopentane...

Oxidic compounds of NiFe2O4 type were synthesized by sol-gel autocombustion method. Reaction in solid phase was monitored by infrared spectroscopy. The structure of synthesized compounds was investigated by IR, XRD and SEM. It was found that these are structure of cubic spinel-type, and the particle size it is of nanometer order, ranging between 22...

The paper presents a kinetic study on the corrosion of 14 types of ATI steels immersed in acid solutions of HCl, H 2SO 4 and CH 3COOH having different concentrations. The iron ions transferred into corrosive solution by anodic dissolution of the steel samples were UV-Vis spectrophotometrically identified and their concentration was determined durin...

The paper presents a kinetic study on the corrosion of 14 types of ATI steels immersed in acid solutions of HCl, H2SO4 and CH3COOH having different concentrations. The iron ions transferred into corrosive solution by anodic dissolution of the steel samples were UV-Vis spectrophotometrically identified and their concentration was determined during d...

h i g h l i g h t s g r a p h i c a l a b s t r a c t < NieZn ferrite doped with Dy as catalyst and magnetic material. < Four chelating/combustion agents were used in solegel method. < Citric acid and cellulose allowed spinel monophase formation confirmed by XRD. < Catalytic activity of ferrite samples is affected by synthesis conditions. < Magneti...

A series of supported Pt-Rh bimetallic systems was prepared either (i) by the refilling method (a surface redox reaction), or (ii) by the classical coimpregnation or (ii) by mechanical mixture of supported monometallic Pt and Rh catalysts and acidic support (chlorinated alumina). Two oxide supports were used for these preparations, i.e. alumina and...

The spinel samples LiMn 2-xCu xO 4 (x = 0.05, 0.10, 0.15, 0.20) were obtained by sol-gel method. The structure was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (FT-IR). The LiMn 2-xCu xO 4 have a cubic structure with the space group of Fd-3m symmetry in which lithium and manganese ions occu...

The spine! samples LiMn2-xCuxO4 (x = 0.05, 0.10, 0.15, 0.20) were obtained by sol-gel method. The structure was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (FT-IR). The LiMn2-xCuxO4 have a cubic structure with the space group of Fd-3m symmetry in which lithium and manganese ions occupy tet...

Bimetallic Pt–Rh catalysts supported on alumina and silica were synthesized either by the refilling method or by coimpregnation. They were characterized by transmission electron microscopy (TEM), H2 chemisorption, temperature-programmed reduction (TPR), Fourier transform infrared (FTIR) of adsorbed CO and the test reaction of cyclohexane dehydrogen...

Platinum based mesostructured SiO2 supported TiO2 nanoclusters (TiO2 content ranging from 10 to 50 wt.%) were synthesized and characterized. Titania nanodomains (< 4 nm) dispersed in the silica porosity are obtained. Derived 1 wt.% Pt/xTiO2-SiO2 nanocomposites were tested in the cyclohexane dehydrogenation reaction, a structure insensitive reaction...

The influence of Sn addition by catalytic reduction method on the Pt-Re/Al2O3 properties for the n-C7 reforming reaction was studied. The Sn addition was performed in different media (HCl and H2O). It was found that trimetallic Pt-Re-Sn/Al2O3-Cl catalysts prepared in H2O or HCl medium present a good interaction between Sn and the catalytically acti...

Several monometallic catalysts supported on alumina were tested in methylcyclopentane ring-opening under pressure. Among the monometallic catalysts tested (Ru, Re, Rh, Pt and Ir), iridium and rhodium catalysts were the most active but iridium was by far the most selective in ring-opening (RO) products (2-methylpentane, 3-methylpentane and n-hexane)...

Ge was deposited by catalytic reduction on Pt−Re/Al2O3−Cl base catalysts prepared by coimpregnation. The nominal amounts of Ge incorporated from various impregnation media (H2O, HCl, or NH3) were 0.1, 0.3, 1.0, and 2.0 wt %. The catalysts were characterized by means of the test reactions of cyclohexane dehydrogenation and cyclopentane hydrogenolysi...

Pt–Ir/Al2O3 catalysts were modified by addition of an inactive metal, germanium, in order to suppress the strong hydrogenolytic activity of this type of naphtha reforming catalyst. The trimetallic systems were prepared by a surface redox reaction called catalytic reduction method. The objective of the study is to examine the influence of the Ge add...