Oxidation - Science topic

In this study, the ceramic coatings containing different concentrations of Zr(CO3)2 are prepared on the surface of titanium alloys by using plasma electrolytic oxidation (PEO) technology to improve the wear resistance of TC4 alloys. The X‐ray diffraction, Raman spectra, X‐ray computer tomography, scanning electron microscopy, and energy dispersive...

Surface wettability are of great significance to electrocatalysts for various electrochemical reaction. In this work, Ni, S co‐doped Co3(PO4)2 nanosheets on Ni foam (Ni‐S‐Co3(PO4)2 NSs) with high hydrophilicity and hierarchical structure are synthesized. The doping of S is the key factor to achieve an ultrahigh hydrophilic surface, identified by th...

Parageobacillus thermoglucosidasius is a thermophilic facultative anaerobe capable of hydrogenogenic carbon monoxide (CO) oxidation utilising nickel‐containing CO dehydrogenase (Ni‐CODH) and energy‐converting hydrogenase (ECH). Nitrates have been reported to exert promoting or inhibitory effects on the growth of CO oxidizers and acetogens, and thes...

The slow hydrogen oxidation reaction (HOR) rate at the anode of the anion exchange membrane fuel cell currently holds back its further development. In this study, N‐doped porous hollow carbon spheres (NHCSs) as a support are created, and highly dispersed small‐sized IrMo nanoclusters (3.05 nm NCs) as the active species within NHCSs. The Ir1Mo5/NHCS...

Structured metal oxide films have promise in optoelectronics, sensing, energy storage, and catalysis but their uptake is predominately limited due to their long and high‐temperature syntheses. Here, a self‐assembling polymer is used which can act as a chelating fuel source in a solution combustion reaction to generate highly structured mesoporous a...

The use of unauthorized quantities of food processing substances/preservatives and fruit ripening agents has raised significant apprehension regarding potential health repercussions. This study evaluated the effect of selected food preservatives and fruit ripening substances, including calcium carbide, bifenthrin, ethanol, ethylene glycol, potassiu...

The development of photoelectrochemical water oxidation (PEC) systems has gained significant relevance in recent years due to the quest for clean fuels, where green hydrogen is one of the main actors in the energy transition. Particularly, there has been a need for precious metal‐free electrodes and photoelectrodes that demonstrate high efficiency...

The oxidation flow reactor (OFR) has been widely used to simulate secondary organic aerosol (SOA) formation in laboratory and field studies. OH exposure (OHexp), representing the extent of hydroxyl (OH) radical oxidation and normally expressed as the product of OH concentration and residence time in the OFR, is important in assessing the oxidation...

The structure, morphology and high-temperature oxidation of composite powders made by high-energy ball milling of powders, mixture of aluminum, activated carbon and graphite in the ratio 95/4/1, were investigated. The ball milling was carried out in AGO-2U laboratory planetary mill with water cooling. The grinding medium consisted mixture of hexane...

In recent years, the use of electrochemistry has emerged as a powerful yet sustainable means of enabling key transformations. Amidation is one of the most frequently executed transformations in synthetic chemistry, and using an electrochemical approach, the current study has demonstrated the synthesis of amides from aldehydes and amines. Mechanisti...

The long-term oxidation behavior of the HAYNES® 282® superalloy was systematically investigated in air at temperatures ranging from 800 to 950 °C for durations of up to 720 h. The oxide phases that developed on the surface of the alloy were characterized using X-ray diffraction and energy-dispersive X-ray spectroscopy (EDS). The residual stress wit...

Symmetry‐breaking in inorganic materials can induce chirality, enabling the integration of structural robustness with the functional advantages of chirality, which holds immense potential across numerous fields. However, achieving stable intrinsic chirality in inorganic materials and optimizing their catalytic performance remains a significant chal...

The efficiency of electrocatalysis for ammonia oxidation reaction (AOR) using platinum catalysts is hindered primarily by slow kinetic rates, attributed to the robust adsorption of nitrogen (*N) and oxygen (*OH) intermediates. To overcome these challenges, a strategy involving the subtle weakening of the adsorption strength of either *N products or...

We synthesize and evaluate a diverse range of Mn/TiO2 catalysts with varying physical and redox properties for the methane‐to‐methyl‐ester reaction using molecular oxygen in a diluted acid medium (10 wt% trifluoroacetic acid). Despite initial differences in manganese distributions, nearly all catalysts are active under the reaction conditions, and...

Comprehensive Summary TAD‐indole adducts, serving as stable surrogates for reactive triazolinediones (TADs), are pivotal in bioconjugation and polymer chemistry but remain limited by cumbersome synthesis. Current methods rely on preformed TADs or stoichiometric oxidants, posing practical and environmental challenges. Herein, we report a sustainable...

The selective oxidation of Ethylbenzene to acetophenone is a crucial transformation in organic synthesis, as acetophenone is a key intermediate in the production of pharmaceuticals, fragrances, and fine chemicals. This study focuses on developing an efficient heterogeneous catalyst for this oxidation reaction under mild reaction conditions. Mesopor...

The long‐lasting stability of high‐voltage lithium metal batteries (LMBs) critically rely on both the cathodic and anodic stability of electrolytes, which can be enhanced by increasing the salt‐to‐solvent molar ratio. However, this approach is limited by solubility constraints. In this work, we introduce a dual‐anchoring strategy to regulate the so...

The availability of active sites and the electronic structure of metal heterogeneous catalysts are crucial to maximize their catalytic performance. In this study, we describe a new and efficient catalyst system, C60 fullerenolamine (FA)‐modified Pd metallene (Pdene), and demonstrate that the FA molecules not only increase the active sites availabil...

Third-generation semiconductors are essential for high-temperature and high-power applications in power electronics. Sintered Cu nanoparticles present promising thermal and mechanical properties as interconnect materials in extreme environments. However, the effects of thermal aging under different atmospheric conditions on their performance requir...

This work employed a novel, easy, and environmentally friendly method for synthesizing platinum nanoparticles over a multi-walled carbon nanotubes (CNTf) surface, employing thiophene (TH) as a reducing agent and stabilizer. The nanoparticle size depends on Pt concentration and TH to be employed as counter electrodes in the I⁻/I3⁻ reduction reaction...

Crystalline MoVTe(Sb)NbO oxide catalysts have been shown to exhibit high oxidation catalytic performance in propane ammoxidation. However, the roles of individual elements remain unclear. In order to elucidate these elemental roles, Nb and Te were introduced into the orthorhombic Mo3VOx oxide (Orth-MoVO) through post-hydrothermal treatment. Structu...

In this research work, the Ti/SnO2-Sb interlayer was successfully prepared via the hydrothermal synthesis method. Subsequently, the outer PbO2 coating was fabricated through electrodeposition technology, resulting in the desired Ti/SnO2-Sb/PbO2 electrode. Characterization of the electrode’s morphology revealed that it is entirely covered by β-PbO2...

A series of hydrotalcite‐derived bimetallic catalysts were prepared, and Ru was loaded by wet impregnation. The catalyst retained a layered structure even after reduction, which was confirmed by Fourier‐transform infrared spectroscopy and powder X‐ray diffraction analyses. Among the prepared catalysts, ruthenium on magnesium–iron (Ru/MgFe) showed t...

Various compositions of silica-supported manganese-copper mixed oxide catalysts were explored for the aerobic oxidation of cyclohexane with molecular oxygen as the oxidant. The investigated SiO2–MnOx–CuO catalysts with varying weight ratios were prepared by the wet-impregnation method. The prepared catalysts were characterized by various techniques...

Umpolung of primary amines via isothiocyanation presents an attractive approach for cross‐linking biorelevant molecules through two nucleophilic handles. However, conventional isothiocyanation reactions typically require highly electrophilic reagents or strongly oxidative conditions, rendering them unsuitable for complex molecular systems. Herein,...

Fuelling during endurance exercise has evolved towards greater amounts of carbohydrates (CHO) ingested per hour, which can prove challenging for athletes. However, the effects of different CHO ingestion patterns during exercise have scarcely been investigated in cycling. 20 recreationally active males cycled for 180 min at lactate threshold on two...

Developing active and stable oxygen evolution reaction(OER) electrocatalysts for water‐splitting hydrogen production under neutral conditions is crucial. Introducing Lewis acid (LA) on catalysts surface can build local alkaline microenvironment to enhance OER, but it may reduce active site exposure. In this work, atomic‐level LA sites (Fe–O and Cr–...

The treatment of rare earth element tailings (REEs) wastewater, a problematic byproduct of rare earth mining processes, presents substantial environmental challenges owing to its characteristic combination of high ammonia nitrogen (NH4⁺-N) concentrations, low organic matter content, and strong acidic conditions. Conventional biological and physicoc...

Encouraged by the successful application of BOPHY dyes in a wide range of scientific fields, from energy to biology, the design of novel compounds based on this type of scaffold appears to be warranted. Herein, we have synthesized a family of symmetric BOPHY dyes bearing arylsulfenyl groups at the 2‐ and 7‐position of the main core, which were full...

Aldehyde‐functionalized oligonucleotides have found diverse applications in chemical biology and material science. However, due to the electrophilic nature of aldehydes, incorporating aldehyde functionalities directly into DNA is challenging, particularly for highly reactive alkyl aldehydes. Inspired by natural oxidases, we herein developed a contr...

To address the issues of low efficiency, significant catalyst loss, and membrane contamination in traditional catalytic ozone oxidation treatments of phenol-containing wastewater, ceramic membranes (CMs) loaded with manganese ferrite (MnFe2O4) were prepared via an impregnation‒calcination method. The materials were characterized and analyzed via X-...

Zeolites are investigated for complete methane oxidation to reduce sintering and deactivation of the active PdO nanoparticles. Pd/H-CHA is shown to have good low-temperature activity and remarkable tolerance to SO2. After an induction period with loss of activity, the activity is recovered and the catalyst withstands more than 200 h on stream with...

A series of new hangman iron corroles with different electronic structure and pending aldehyde group were prepared and used as catalyst in Baeyer–Villiger (B–V) oxidation reactions. The results show that hangman iron corroles exhibit faster reaction rates and higher ε‐caprolactone yields as compared to triaryl iron 5,10,15‐tri(pentafluorophenyl) co...

Oxidation is a fundamental industrial process due to its ability to produce valuable compounds, particularly the transformation of alcohols into carbonyl derivatives. While extensive research has explored this conversion, limited attention has been given to the kinetic and thermodynamic aspects. This study investigates the oxidation kinetics of sel...

Direct seawater electrolysis for hydrogen production is hindered by high energy consumption and the competing chlorine evolution reaction (CER), which compromises efficiency and generates corrosive byproducts. Replacing oxygen evolution reaction (OER) with sulfion oxidation reaction (SOR) is promising to circumvent CER, but practical applications d...

Preferential oxidation of CO in H2 (CO‐PROX) is a promising solution to remove the residual CO in the feed stream to avoid Pt poisoning in proton‐exchange‐membrane fuel cells (PEMFCs), in which the development of high‐efficiency catalysts with a wide temperature window remains a great challenge. Herein, we report a Fe(OH)x modified Pt clusters (∼1....

This study investigates the effectiveness in soot oxidation under tight and loose contact of Ag/CeO2, Ag/MnOx, and Ag/CeMnOx catalysts with different Ce:Mn molar ratios prepared by the citrate sol‐gel method. The sol‐gel method promoted the formation of a nanodomain structure in the CeMnOx composite. The interaction between cerium and manganese oxi...

This thesis describes the preparation and characterization complexes of transition metal ions of the Mo (VI) and VO(II) with (Bidentate and Monodentate) ligands in different molar ratio, as well as their mixed-ligands complexes with, Bipyridine(Bipy), 3-Aminopyridine (APY), 2-Hydroxy-1,4-naphthoquinone (HNQ) ligands. This work can be briefed as fol...

Introduction The synthesis of sintered glass ceramics and ceramic foams, obtained using three different waste precursors, is the topic under discussion. We propose investigations related to obtaining new inorganic foams from different waste raw materials, containing iron oxides. As a consequence, the observed sample expansion can be considered as a...

Ammonia oxidation reaction (AOR) is important for enabling the efficient use of NH3 as a promising carrier for hydrogen storage and transportation. However, the catalytic activity of state‐of‐the‐art Pt‐based catalysts decreases significantly due to the strong adsorption of N species. In this study, a triple‐layer core–shell structured Ru@Ir@Pt mod...

Edible oils are essential to human nutrition, providing vital sources of energy, essential fatty acids, and fat-soluble vitamins that support overall health and bodily functions. However, these oils are prone to oxidation during storage, handling, and cooking. This can lead to the formation of potentially harmful substances. To counter this, synthe...

Electronic manipulation of boron centers in polycyclic aromatic hydrocarbon (PAHs) frameworks often leads to unique redox and photophysical properties. Herein, we report the first isolation and redox investigation of carbene-stabilized 6,12-diboraanthanthrenes 3/4 with electron-rich boron centers. Combining experimental and theoretical studies conf...

Bismuth vanadate (BiVO4) is known as one of the most potential candidates in photocatalytic water oxidation for supplying oxygen in extreme environment. However, its photocatalytic oxygen evolution is hindered by the rapid photogenerated charge carrier separation efficiency. Herein, plasmonic bismuth (Bi) nanoparticles loaded BiVO4 is prepared for...

Achieving exceptional oxidation resistance at elevated temperatures is long desirable for ultrahigh‐temperature materials to be used in relevant applications such as hypersonic flights, re‐entry vehicles, and propulsion systems. However, their practical service temperatures are typically limited to below 3000 °C. Here, the exploration of (Hf, Ta, Z...

An improved synthesis of the alkaloid dihydrocarneamide A is reported and this has been subjected to a biomimetic‐type oxidative rearrangement using an oxaziridine and so affording the oxidole‐containing and prenylated indole alkaloids (PIAs) asperversiamides H and M. This work serves to confirm the structure assigned to the latter. Oxidation of di...

Photoelectrochemical (PEC) technology offers a direct pathway to convert solar energy into energy carriers (e.g., hydrogen) without the need for solar‐to‐electricity infrastructure. However, scaling PEC systems to industrial levels remains a challenge due to the limited light absorption capabilities of traditional semiconductors and the energy‐inte...

Development of nano catalyst systems with extended durability toward sulfion oxidation reaction (SOR) offers an energy efficient route to green H2 production and process harmful industrial waste to value added chemical. However, most of the reported nanocatalysts for the above operation suffer from sulfur poisoning leading to compromised durability...

A simple method for the electrochemical allylic oxidation of olefins to enones based on peroxide‐mediated C–H activation is presented. t‐Butyl hydroperoxide serves a dual role as mediator and oxygen source, avoiding the utilization of expensive transition metal catalysts, potentially explosive supporting electrolytes such as perchlorates, or additi...

Chemicals derived from biomass lignin, with phenolic compounds, are particularly valuable in organic synthesis and catalytic conversion. The electrochemical conversion of biomass materials has gained significant attention in recent years as a sustainable means of producing value‐added chemicals. A green process has been developed utilizing electroc...

This study investigates primary emissions and photochemical aging evolution mechanisms of PM2.5 Nitroaromatic compounds (NACs) released from solid fuels through conducting field combustion experiments. The emission factors (EFs) of NACs primary emissions are much higher from biomass burning (BB) than coal combustion (CC). The EFs of measured NACs s...

The sluggish kinetics of the six‐electron transfer process and the inevitable self‐oxidation reaction of Ni species (NSOR) during the urea oxygen reaction (UOR) necessitate the development of efficient urea oxidation electrocatalysts. This study introduces a mild chemical modulation strategy, which is used to trigger the occurrence of UOR before NS...

Selectively aerobic oxidation of toluene to benzaldehyde is an important but challenging task due to the high proclivity of aldehydes to undergo over‐oxidation to acids. Herein, we report a new multiphoton excitation approach for synthesizing benzaldehyde from toluene by integrating oxygen vacancy and proton‐coupled electron transfer (PCET) events...

This study examined how adding Al affects the surface oxide scale and internal oxidation behavior of AHSS in hot-rolled coil processes. Experimental results showed that Al-containing alloys exhibited a significantly shallower internal oxidation depth. Additionally, the transformation of the surface oxide layer into reduced metallic iron occurred at...

A series of LaCoO3 chalcogenide catalysts were prepared by the sol–gel method and doped with Cu on the B‐site (LaCo1‐xCuxO3). The catalytic activity of these chalcogenide catalysts was evaluated for the deep oxidation of toluene. The results of Raman spectroscopy, H2‐TPR, O2‐TPD, and XPS indicated that the strong interaction between Co and Cu promo...

Electrocatalytic H2 generation via conventional water splitting is gaining attention, but challenges such as high overpotentials, energy demands, and slow kinetics limit its scalability. Here, a novel approach: coupling hydrogen evolution reactions (HER) with alcohol and aldehyde oxidation reactions (AAORs) is explored. This strategy decreases ener...

The objective of this study was to evaluate the kinetic parameters of oxidation of Leonotis nepetifolia oil using mathematical models to determine its stability and shelf life. The oil was extracted by cold pressing and analyzed using the Rancimat method under a constant airflow of 15 L·h⁻¹ at temperatures of 100, 110, 120, 130, and 140 °C. Kinetic...

Noble metals are widely recognized for their ability to catalyze the electro-oxidation of organic compounds, with smaller particle sizes significantly enhancing electrocatalytic activity. In this study, catalytic electrodes decorated with atomic-level platinum and Pt-Au clusters were fabricated using cyclic atomic-metal electrodeposition. The inter...

This paper reports experimental and computational studies on the mechanism of a popular and well-known procedure for the oxidation of alcohols to carbonyl compounds using TEMPO and the hypervalent iodine reagent PIDA. Easy to obtain kinetic data shows that the mechanism, long assumed but never investigated, is unlikely to be in operation due to zer...

The design of covalent organic frameworks (COFs) with tailored electronic structures is crucial for enhancing photocatalytic performances and offers an alternative pathway for hydrogen peroxide (H2O2) synthesis. In this study, the construction of customized COFs featuring in‐plane and intramolecular asymmetric polarization is reported to boost char...

The electrochemical nitrogen reduction reaction (ENRR), when coupled with the oxygen evolution reaction (OER), presents a sustainable, safe, and energy‐efficient alternative to the traditional Haber–Bosch process for ammonia synthesis. In this work, the rational design, synthesis, and electrochemical evaluation of two cobalt (II)‐based metal–organi...

Polystyrene (PS) microplastics from styrofoam waste are persistent contaminants that are difficult to degrade naturally in aquatic environments and require effective extraction methods for analysis and mitigation. This study aims to determine the optimal conditions of Fe(II) concentration and heating temperature in the Wet Peroxide Oxidation (WPO)...

In this research, we used a straightforward and cost-effective methodology to fabricate a three-dimensional nickel-molybdenum (NiMo) thin-layer coating, sparsely decorated with gold crystallites, on a titanium substrate (denoted as Au(NiMo)/Ti). The catalysts were prepared by depositing NiMo onto a Ti surface through a simple electrochemical deposi...

In this paper, Ti Alloy samples were coated with aluminium. Through surface engineering using the method of diffusion coating with aluminium. The aluminium coating process was carried out using the method of animalization and duration (2, 4,6 hours) at temperature f (1000 °C). FTo know the efficiency of the coating in defending the alloy from hot c...

Chiral polyoxygenated cyclohexanes are valuable constituents of biologically relevant products. Herein, we report a protocol for the direct access to these scaffolds via site‐ and enantioselective non‐directed oxidation of cyclohexyl‐3,5‐meso diethers using aqueous H₂O₂. Structural shaping of a highly reactive chiral Mn‐oxo species, achieved throug...

Geminal diol (gem‐diol) moieties commonly exist in equilibrium with ketones or aldehydes when water is present in the system. While significant progress has been made in their structural characterization, recent studies have increasingly focused on the reactivity of gem‐diol intermediates. In parallel, gem‐diol‐type hydroxyl‐oxoammonium species hav...

The analysis of available works in the literature, including our own, was carried out, on the basis of which this review article was prepared. The interest shown in the processes of oxidative synthesis at high anodic potentials is associated with the production of various types of organic and inorganic, including mixtures of organo-inorganic compou...

Background: Adherence to the Mediterranean diet (MedDiet) offers multiple metabolic benefits. However, its relationship with maximal fat oxidation (MFO) and cardiorespiratory fitness (VO2max), alongside the potential mediating role of leptin, remains underexplored in young adults. Objective: The objective was to investigate the associations between...

Developing titanium aluminides (Ti-Al) based alloys by means of Laser Engineered Net Shaping (LENS) in-situ manufacturing presents attractive properties as compared to other fabrication methods. Ti-Al alloys have attracted much attention for high-temperature performance in gas turbine and automobile applications because of their attractive properti...

La‐doped ZrO2 catalysts were prepared by varying the lanthanum metal precursor in order to obtain 0, 3, and 5 wt.%. The resulting materials were fully characterized and evaluated their catalytic and selectivity performance in the oxidation of thioanisole with hydrogen peroxide as oxidant under mild reaction conditions. Doping of zirconia oxide with...

The lack of p‐type conductivity in metal oxide semiconductors presents the major limitation for their integration into complementary metal‐oxide‐semiconductor (CMOS) technology, which requires both n‐type and p‐type semiconductors for balanced and efficient operation. Titanium dioxide (TiO2) is known for its wide‐gap n‐type semiconductor characteri...

The crystal–chemical behavior of two layered titanosilicate minerals with porous crystal structures, kupletskite, K2NaMn72+Ti2(Si4O12)2O2(OH)4F, and kupletskite-(Cs), Cs2NaMn72+Ti2(Si4O12)2O2(OH)4F, was investigated under high-temperature conditions using single-crystal and powder X-ray diffraction; infrared and optical absorption spectroscopy and...

Throughout the medical industry the standard approach to lifetime prediction is to take the "ASTM standard", assume that Q10=2 and hope that the necessarily long-life tests (the acceleration from Q10=2 is relatively small) give a successful outcome. There are two big problems with this approach. The first is the long testing times and, as we shall...

Flame retardancy is essential for epoxy resins (EP) used in safety‐critical applications. Although phosphorus‐based flame retardants have shown effectiveness, most studies have focused on small‐molecule systems, with limited attention on their oligomeric counterparts. In this study, two phosphorus‐nitrogen synergistic oligomeric flame retardants wi...