Science topics: ChemistryCatalysis
Science method

# Catalysis - Science method

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Publications related to Catalysis (10,000)
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In 2011, Zhang’s research team discovered the first atomically dispersed Pt1/FeOx catalysts worldwide and proposed the concept of “single-atom catalysis”. The excellent atomic utilization rate of single-atom catalysts (SACs) in combination with their high specific catalytic activity makes them extremely appealing for environmental remediation. As r...
Article
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Purpose The purpose of this study is to define and analyse the emergence of collaborative engagement platforms (CEPs) as part of a rising platformisation phenomenon. Contrary to previous literature on engagement platforms (EPs), this study distinguishes between formalised and self-organised EPs and sheds light on collaborative EPs on which heteroge...
Article
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Electrochemical and photoelectrochemical water splitting offers a scalable approach to producing hydrogen from renewable sources for sustainable energy storage. Depending on the applications, oxygen evolution catalysts (OECs) may perform water splitting under a variety of conditions. However, low stability and/or activity present challenges to the...
Article
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Oxygen vacancies ( V o ) in electrocatalysts are closely correlated with the hydrogen evolution reaction (HER) activity. The role of vacancy defects and the effect of their concentration, however, yet remains unclear. Herein, Bi 2 O 3 , an unfavorable electrocatalyst for the HER due to a less than ideal hydrogen adsorption Gibbs free energy (Δ G H*...
Article
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The Sars-CoV-2 pandemic catalysed integration of telemedicine worldwide. This systematic review assesses it’s accuracy for diagnosis of Surgical Site Infection (SSI). Databases were searched for telemedicine and wound infection studies. All types of studies were included, only paired designs were taken to meta-analysis. QUADAS-2 assessed methodolog...
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Dielectric substances exhibit great potential for high-power capacitors due to their high stability and fast charge–discharge; however, a long-term challenge is to enhance energy density. Here, we propose a poly(vinylidene fluoride) (PVDF) composite utilizing BaTiO3 nanoparticle@TiO2 nanosheet (BT@TO ns) 2D nanohybrids as fillers, aiming at combini...
Article
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Catalysis is inherently driven by the interaction of reactants, intermediates and formed products with the catalyst’s surface. In order to reach the desired transition state and to overcome the kinetic barrier, elevated temperatures or electrical potentials are employed to increase the rate of reaction. Despite immense efforts in the last decades,...
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The heteroleptic six‐component double slider‐on‐deck system DS3 exhibits tight coupling of motional speed of two distinct nano‐circular sliders (k298 = 77 and 41 kHz) despite a 2.2 nm sepa­ration. In comparison, the single sliders in DS1 and DS2 move at vastly diffe­rent speed (k298 = 1.1 vs. 350 kHz). Synchro­nization of the motions in DS3 remains...
Article
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F-type ATP synthases are transmembrane enzymes, which play a central role in the metabolism of all aerobic and photosynthetic cells and organisms, being the major source of their ATP synthesis. Catalysis occurs via a rotary mechanism, in which the free energy of a transmembrane electrochemical ion gradient is converted into the free energy of ATP p...
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Although, quantum dots (QDs) of two-dimensional (2D) molybdenum disulfide (MoS2) have shown great potential for various applications, such as sensing, catalysis, energy storage, and electronics. However, the lack of a simple, scalable, and inexpensive fabrication method for QDs is still a challenge. To overcome this challenge, a lot of attention ha...
Article
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To date, the effect of oxidation state on activity remains controversial in whether higher or lower oxidation states benefit the enhancement of catalytic activity. Herein, we discover a volcanic relationship between oxidation state and hydrogen evolution reaction activity based on Os single-atom catalysts. Firstly, a series of Os SACs with oxidatio...
Article
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Inspired by the proficiency of natural enzymes, mimicking of nanoenvironments for precise substrate preorganization is a promising strategy in catalyst design. However, artificial examples of enzyme-like activation of H2O molecules for the challenging oxidative water splitting reaction are hardly explored. Here, we introduce a mononuclear Ru(bda) c...
Article
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The alkylation reactions of 5-nitrobenzimidazol-2-one have been carried out using benzyl chloride, picolyl chloride, N-3-(bromopropyl)phtalimide, cinnamyl bromide, allyl bromide, propargyl bromide as alkylating agents in liquid-solid phase transfer catalysis (PTC) conditions. The structures of the obtained dialkylated benzimidazolones have been elu...
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Here, we studied the stereoselective transesterification of 4-bromomandelic acid enantiomers and acyl donors catalyzed by lipase in the organic phase. By investigating various experimental parameters, the optimal reaction system for the resolution of 4-bromomandelic acid enantiomers catalyzed by Pseudomonas fluorescens lipase was constructed. Under...
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This review article emphasizes the C–C bond cleavage in organic synthesis via metal-free approach. Conventional organic synthesis mainly deals with the reactive π bonds and polar σ bonds. In contrast, the ubiquitous C–C single bonds are inherently stable and are less reactive, which poses a challenge to synthetic chemists. Although inert, such C–C...
Technical Report
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Food Systems Profile - Zimbabwe. Catalysing the sustainable and inclusive transformation of food systems
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2-benzoyl-1,4-benzothiazin-3-one 1 under the liquid-solid phase transfer catalysis in the presence of an excess of methyl chloroacetate undergoes a ring transformation to lead to 1-methoxycarbonylmethyl 1,3-benzothiazol-2-one 2. Also the condensation of compound 1 with hydrazine hydrate in refluxing methanol in the presence of hydrochloric acid aff...
Preprint
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We investigate catalysis in the framework of elementary thermal operations, making use of its unique advantages to illuminate catalytic dynamics. As groundwork, we establish new technical tools that improve the computability of state transition rules for elementary thermal operations, in particular, providing a full characterization of state transi...
Article
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Having the excellent catalytic performance, single atom catalysts (SACs) arouse extensive research interest. However, the application of SACs is hindered by the lack of versatile and scalable preparation approaches. Here, we show a precursor-atomization strategy to produce SACs, involving the spray of droplets of solutions containing metal precurso...
Preprint
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High catalytic activities of Ru-PNP complexes in ionic liquid (IL) were obtained for the reversible hydrogenation of CO2 and dehydrogenation of formic acid (FA) under exceedingly mild conditions. The novel catalytic system relies on an unprecedented IL-promoted activation of CO2 and proceeds already at 25 ⁰C under a continuous flow of 1 bar of CO2/...
Article
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Metal ions are potent catalysts and have been available for cellular biochemistry at all stages of evolution. Growing evidence suggests that metal catalysis was critical for the origin of the very first metabolic reactions. With approximately 80% of modern metabolic pathways being dependent on metal ions, metallocatalysis and homeostasis continue t...
Article
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(R)-(+)-1-(1-naphthyl)-ethylamine (R-1-NEA) and (S)-(-)-1-(2-naphthyl)-ethylamine (S-2-NEA) were studied on Pd(1 1 1) in ultrahigh vacuum using reflection–absorption infrared spectroscopy (RAIRS) to measure the structure, bonding and orientation using the frequency shifts and surface infrared selection rules. Temperature-programmed RAIRS experiment...
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The lithium-sulfur battery has high theoretical specific capacity (1675 mAh g⁻¹) and energy density (2567 Wh kg⁻¹), and is considered to be one of the most promising high-energy–density storage battery systems. However, the polysulfides produced during the charging and discharging process of the lithium-sulfur battery will migrate back and forth be...
Presentation
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Inisiatif Sabuk dan Jalan China (BRI) mengembangkan sistem interaksi dengan negara-negara anggota untuk meningkatkan integrasi ekonomi dan lingkungan. Melalui BRI, negara-negara tersebut kini berkembang di bidang pengelolaan keuangan, energi, dan lingkungan. Ini mengangkat pentingnya untuk menguji hubungan antara energi, keuangan dan konstruksi ter...
Article
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Biomass materials are advantageous as carbon resources for various applications including electromagnetic (EM) conversion due to their abundance and renewability. To select the most appropriate biomass, various factors should be considered while there is a lack of comparisons in-between. Here, six types of biomass precursors have been investigated...
Article
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Sustainability reports are regarded as important tools in offering information about the environmental, social, economic, and institutional performance of an institution, and in demonstrating a commitment to matters related to sustainable development. But even though sustainability reporting has been used by a variety of higher education institutio...
Article
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In this research, a simple, efficient and novel protocol is eveloped for the direct synthesis of symmetrical disulfides using dipotassium 1,3,4-thiadiazole-2,5-bis(thiolate) as a new, low toxicity, inexpensive, stable solid and free of foul-smelling thiols for synthesize symmetric diaryl/dialkyl disulfides from aryl and alkyl halides in presence of...
Preprint
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Herein, we report a gold-catalyzed Heck reaction facilitated by the ligand-enabled Au(I)/Au(III) redox catalysis. The elementary organometallic steps such as migratory insertion and ß-hydride elimination have been realized in the catalytic fashion for the first time in gold chemistry. The present methodology not only overcomes the limitations of pr...
Article
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The reduction of nitriles to primary amines is a useful transformation in organic synthesis, however, it often relies upon stoichiometric reagents or transition-metal catalysis. Herein, a borane-catalysed hydroboration of nitriles to give primary amines is reported. Good yields (48–95%) and chemoselectivity (e.g., ester, nitro, sulfone) were observ...
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In this article, we have explored the very important quantity of lepton pair production from a hot and dense QCD medium in presence of an arbitrary external magnetic field for simultaneous nonzero values of both the parallel (along the direction of the external field) and perpendicular (lying on the transverse plane to the external field) component...
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We investigate magnetic field (eB) dependence of constituent quark mass, the longitudinal and transverse pressure as well as the magnetization and magnetic susceptibility of strongly interacting quark matter. We employ the two-flavor Polyakov Nambu–Jona-Lasinio model with the inclusion of the anomalous magnetic moment (AMM) of the quarks at finite...
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Chiral α-aminoboronic acids and their derivatives are generally useful as bioactive compounds and some have been approved as therapeutic agents. Here we report a NiH-catalysed asymmetric hydroamidation process that with a simple amino alcohol ligand can easily produce a wide range of highly enantioenriched α-aminoboronates from alkenyl boronates an...
Article
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In living organisms, enzyme catalysis takes place in aqueous media with extraordinary spatiotemporal control and precision. The mechanistic knowledge of enzyme catalysis and related approaches of creating a suitable microenvironment for efficient chemical transformations have been an important source of inspiration for the design of biomimetic arti...
Chapter
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The rapidly expanding field of metal-organic frameworks (MOFs) and their numerous associated applications has captured the interest of researchers worldwide. These materials are often difficult to fully characterize through one specific avenue due to their intricate and occasionally complicated structures, highlighting the need for a multi-pronged...
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Due to their highly changeable porosity and adaptable skeletons, covalent organic frameworks (COFs) have been frequently used in supercapacitors. Additionally, COFs are a wonderful match for supercapacitors’ requirements for quick carrier migration and ion catalysis. COFs exhibit significant potential and limitless opportunities in electrochemical...
Preprint
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The Catellani reaction, i.e. the Pd/NBE cooperative catalysis, has been evolved into a versatile approach to multisubstituted arenes via the ortho-functionalization/ipso-termination process of a haloarene. Despite significant advances over the past 25 years, this reaction still suffered from an intrinsic limitation in the substitution pattern of th...
Article
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Organophosphorus ligands are an invaluable family of compounds that continue to underpin important roles in disciplines such as coordination chemistry and catalysis. Their success can routinely be traced back to facile tuneability thus enabling a high degree of control over, for example, electronic and steric properties. Diphosphines, phosphorus co...
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Nanoporous (NP) metals represent a unique class of materials with promising properties for a wide set of applications in advanced technology, from catalysis and sensing to lightweight structural materials. However, they typically suffer from low thermal stability, which results in a coarsening behavior not yet fully understood. In this work, we foc...
Preprint
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Ring-closing metathesis (RCM) represents an ideal and atom-economical way to construct cyclic compounds. The precedented reaction systems for endo-selective enyne RCM mainly rely on precious transition metal carbene complexes or activated substrates. Here we report the utility of group 13 metal halides, such as InBr3 and InI3, as simple and efficie...
Preprint
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Pt catalyst particles on reducible oxide supports often change their activity significantly at elevated temperatures due to the strong metal-support interaction (SMSI), which induces the formation of an encapsulation layer around the noble metal particles. However, the impact of oxidizing and reducing treatments at elevated pressures on this encaps...
Preprint
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Pion superfluid phase transition under external magnetic field including the inverse magnetic catalysis (IMC) effect is investigated by the Pauli-Villars regularized NJL model. Based on the Goldstone's theorem, we apply the massless Goldstone boson ($\pi^+$ meson) to determine the onset of pion superfluid phase. The inverse magnetic catalysis effec...
Article
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El desarrollo científico de los materiales ha estado a la vanguardia del desarrollo tecnológico en muchos campos de la ciencia, como la electrónica, la catálisis, el medio ambiente y ahora la medicina, entre otros. Durante el conocimiento básico de los materiales aparecen nuevas propiedades, conceptos y leyes que los rigen, encontrando prácticament...
Article
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There is growing interest in the design of bimetallic cooperative complexes, which have emerged due to their potential for bond activation and catalysis, a feature widely exploited by nature in metalloenzymes, and also in the field of heterogeneous catalysis. Herein, we discuss the widespread opportunities derived from combining two metals in close...
Article
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Sulfamates are widespread in numerous pharmacologically active molecules. In this paper, Silver/Bathophenanthroline catalyzed the intramolecular selective amination of primary C(sp3)−H bonds and secondary C(sp3)−H bonds of sulfamate esters, to produce cyclic sulfamates in good yields and with a high site-selectivity. DFT calculations revealed that...
Article
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Perovskite has attracted the attention of researchers owing to its intriguing physicochemical properties and wide applications. Recently, Fe-based Perovskite as well as its nanoforms is an extensively studied material due to its photocatalytic activity, multiferroic properties, and chemical stability. Fe-based Perovskite exhibits a range of charact...
Article
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The enormous complexity of the carbon material family has provoked a phenomenological approach to develop its potential in different applications. Although the electronic, chemical, mechanical, and magnetic properties of carbon materials have been widely discussed based on defect control engineering, there is still a lack of fundamental understandi...
Article
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Photoinduced atom transfer radical polymerization (photo-ATRP) has risen to the forefront of modern polymer chemistry as a powerful tool giving access to well-defined materials with complex architecture. However, most photo-ATRP...
Preprint
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Pyruvate dehydrogenase complex (PDHc) suppression has long been regarded as a mechanism for cancer cells to manifest the well-known Warburg effect. However, in recent years, it has been proposed that whether PDHc is suppressed or activated in cancer development is context-dependent. The PDHc E1 subunit (PDH E1), a thiamine pyrophosphate (TPP)-depen...
Article
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Bioorthogonal chemistry introduces nonbiogenic reactions that can be performed in biological systems, allowing for the localized release of therapeutic agents. Bioorthogonal catalysts can amplify uncaging reactions for the in situ generation of therapeutics. Embedding these catalysts into a polymeric nanoscaffold can protect and modulate the cataly...
Presentation
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Catalyst is the heart of ammonia plants. A catalyst accelerates reaction by providing alternate paths to products, the activation energy of each catalytic step being less than that of no catalytic reaction, in the reaction cycle, active centers of catalysis first combine with at least one reactant and then is reproduced with the appearance of produ...
Article
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The selective oxidation of glycerol to glyceric acid, an important value-added reaction from polyols, is a typical cascade catalytic process. It is still of great challenge to simultaneously achieve high glycerol activity and glyceric acid selectivity, suffering from either deep oxidation and C-C cleavage or poor oxidation efficiency from glycerald...
Article
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Continuous-variable quantum teleportation (CVQT) plays a vital role in practical quantum communications. However, the degradation of quantum signals, usually caused by the absorption and scattering of light in actual scenarios, has an influence on the transmission performance and hence hinders its implementations. In this paper, we propose a non-Ga...
Article
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Enantioselective synthesis through photocatalysis is one of the highly preferred approaches towards preparation of optically active compounds. This review elaborates and critically analyzes the different strategies of photocatalytic enantioselective reactions through H-bonding, transition metal catalysis, phase-transfer catalysis (PTC), chiral Lewi...
Preprint
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The reduction reaction of turning Cr(VI) into Cr(III) by appropriate oxidants together with nanoscale catalysts in contaminated soil and water received significant amount of attention for its environmental benefits. Single-atom catalysts (SACs), as an emergent new type of catalysts, show great potential for simultaneous adsorption for the Cr(VI) re...
Article
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Over the last two decades, the analysis of DNA traces found at a crime scene have expanded the already established forensic DNA analysis for identification to include new techniques intended to predict a criminal suspect's externally visible characteristics, such as eye, hair and skin colour ('forensic DNA phenotyping'), or his or her ethnic, conti...
Article
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Developing efficient and cost-effective non-noble metal catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) is of great importance. Herein, Co-promoted 1T-MoS2 nanoflowers were synthesized via a one-step hydrothermal method. The influence of Co content on the structure and catalytic performance of 1T-MoS2 was studied in deta...