1,288 results match your criteria catalyst prepare


A highly durable CoOx/N-doped Graphitized- Nano-Diamond electrocatalyst for oxygen reduction reaction.

Nanotechnology 2021 May 13. Epub 2021 May 13.

Henan Functional Diamond Material Innovation Center, Zhengzhou, CHINA.

Oxygen reduction reaction (ORR) occupies a pivotal position in fuel cell applications, and it is a challenge to obtain highly durable ORR catalysts. Herein, porous cobalt oxide microsphere growing at the surface of on nitrogen-doped graphitized-nano-diamond (CoOx/N-GND) was prepared using hydrothermal and subsequent heat treatment process. Porous cobalt oxide of high specific surface area could expose more surface Co2+ that act as active sites than bulk one does. Read More

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Biocatalytic asymmetric synthesis of (R)-1-tetralol using Lactobacillus paracasei BD101.

Chirality 2021 May 10. Epub 2021 May 10.

Faculty of Health Sciences, Department of Nutrition and Dietetics, Bayburt University, Bayburt, Turkey.

Asymmetric bioreduction of ketones is a fundamental process in the production of organic molecules. Compounds containing tetralone rings are found in the structure of many biologically active and pharmaceutical molecules. Biocatalytic reduction of ketones is one of the most promising and significant routes to prepare optically active alcohols. Read More

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A strategy of utilizing Cu-mediating interaction to prepare magnetic imprinted polymers for the selective detection of celastrol in traditional Chinese medicines.

Talanta 2021 Aug 24;231:122339. Epub 2021 Mar 24.

College of Chemistry, Tianjin Key Laboratory of Biosensing and Molecular Recognition, State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China; Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116011, China.

In this work, a novel strategy to prepare molecularly imprinted polymers (MIPs) functionalized magnetic carbon nanotubes (MCNTs) via a facile sol-gel polymerization by adopting Cu-mediating interaction was presented for selective recognition of celastrol (Cel), in the traditional Chinese medicines (TCM). Firstly, template Cel, 3-aminopropyltriethoxysilane (APTES) as monomer and Cu (co-monomer) were mixed to form a self-assembled pre-complex, in which Cu could coordinate with Cel. Meanwhile, APTES plays a role of bridge between APTES and Cel. Read More

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Recent Developments in Ring-Opening Copolymerization of Epoxides With CO and Cyclic Anhydrides for Biomedical Applications.

Front Chem 2021 20;9:647245. Epub 2021 Apr 20.

School of Materials Science and Engineering, Tongji University, Shanghai, China.

The biomedical applications of polyesters and polycarbonates are of interest due to their potential biocompatibility and biodegradability. Confined by the narrow scope of monomers and the lack of controlled polymerization routes, the biomedical-related applications of polyesters and polycarbonates remain challenging. To address this challenge, ring-opening copolymerization (ROCOP) has been exploited to prepare new alternating polyesters and polycarbonates, which would be hard to synthesize using other controlled polymerization methods. Read More

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Supercritical Carbon Dioxide-Based Processes in Photocatalytic Applications.

Molecules 2021 Apr 30;26(9). Epub 2021 Apr 30.

Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy.

Conventional methods generally used to synthesize heterogeneous photocatalysts have some drawbacks, mainly the difficult control/preservation of catalysts' morphology, size or structure, which strongly affect the photocatalytic activity. Supercritical carbon dioxide (scCO)-assisted techniques have recently been shown to be a promising approach to overcome these limitations, which are still a challenge. In addition, compared to traditional methods, these innovative techniques permit the synthesis of high-performance photocatalysts by reducing the use of toxic and polluting solvents and, consequently, the environmental impact of long-term catalyst preparation. Read More

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Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives.

Membranes (Basel) 2021 Apr 27;11(5). Epub 2021 Apr 27.

Department of Textile Technology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.

Fabrication of block copolymer (BCP) template-assisted nano-catalysts has been a subject of immense interest in the field of catalysis and polymer chemistry for more than two decades now. Different methods, such as colloidal route, on-substrate methods, bulk self-assembly approaches, combined approaches, and many others have been used to prepare such nano-catalysts. The present review focuses on the advances made in this direction using diblock, triblock, and other types of BCP self-assembled structures. Read More

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MIL-101-Derived Mesoporous Carbon Supporting Highly Exposed Fe Single-Atom Sites as Efficient Oxygen Reduction Reaction Catalysts.

Adv Mater 2021 Apr 29:e2101038. Epub 2021 Apr 29.

Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

Fe single-atom catalysts (Fe SACs) with atomic FeN active sites are very promising alternatives to platinum-based catalysts for the oxygen reduction reaction (ORR). The pyrolysis of metal-organic frameworks (MOFs) is a common approach for preparing Fe SACs, though most MOF-derived catalysts reported to date are microporous and thus suffer from poor mass transfer and a high proportion of catalytically inaccessible FeN active sites. Herein, NH -MIL-101(Al), a MOF possessing a mesoporous cage architecture, is used as the precursor to prepare a series of N-doped carbon supports (denoted herein as NC-MIL101-T) with a well-defined mesoporous structure at different pyrolysis temperatures. Read More

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Stereoretentive N-Arylation of Amino Acid Esters with Cyclohexanones Utilizing a Continuous-Flow System.

Chemistry 2021 Apr 28. Epub 2021 Apr 28.

University of Tokyo: Tokyo Daigaku, Department of Chemistry, School of Science, Hongo, Bunkyo-ku, 113-0033, JAPAN.

The N-arylation of chiral amino acid esters with minimal racemization is a challenging transformation because of the sensitivity of the α-stereocenter. We developed a versatile synthetic method to prepare N-arylated amino acid esters using cyclohexanones as aryl sources under continuous-flow conditions. The designed flow system, which consists of a coil reactor and a packed-bed reactor containing a Pd(OH)2/C catalyst, efficiently afforded the desired N-arylated amino acids without significant racemization, accompanied by only small amounts of easily removable co-products (i. Read More

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Biological compatibility, thermal and in vitro simulated degradation for poly(p-dioxanone)/poly(lactide-co-glycolide)/poly(ethylene succinate-co-glycolide).

J Biomed Mater Res B Appl Biomater 2021 Apr 24. Epub 2021 Apr 24.

College of Chemistry and Materials Science, Fujian Key Laboratory of Polymer Science, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian Normal University, Fuzhou, China.

Bio-absorbable polymers are widely desired to be applied and used as biomaterials for surgery hemostatic and medical tissue engineering devices. Ring-opening copolymerization reaction was applied to synthesize poly(ethylene succinate-co-glycolide) (PES-b-PGA). Stannous octoate was used as a catalyst whereas poly(ethylene succinate) was used as a macro-initiator to react with glycolide. Read More

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Single-Step Approach toward Nitrones via Pyridinium Ylides: The DMAP-Catalyzed Reaction of Benzyl Halides with Nitrosoarenes.

J Org Chem 2021 May 23;86(9):6343-6350. Epub 2021 Apr 23.

College of Pharmacy, Inje Institute of Pharmaceutical Sciences and Research, Inje University, 197 Inje-ro, Gimhae, Gyeongnam 50834, Republic of Korea.

A single-step approach is reported for the preparation of nitrones from benzyl halides and nitrosoarenes via pyridinium ylides, utilizing 4-dimethylaminopyridine (DMAP) catalyst and mild reaction conditions (LiCO, dimethylacetamide, and room temperature). The reaction provides both keto- and aldonitrones in high yields with a wide scope for benzyl halides and nitrosoarenes. In the same reaction system, 2-methyl-2-nitrosopropane, which does not have an aryl group, also affords the corresponding --butyl nitrones from primary benzyl bromides that have an electron-withdrawing group. Read More

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Structural dependence of electrosynthesized cobalt phosphide/black phosphorus pre-catalyst for oxygen evolution in alkaline media.

Nanoscale 2021 Apr 13;13(15):7381-7388. Epub 2021 Apr 13.

Key Laboratory of Magnetic Molecules & Magnetic Information Materials, Ministry of Education, The School of Chemical and Material Science, Shanxi Normal University, Linfen 041004, China.

The integration of black phosphorus (BP) with metal phosphides is known to produce high-performance electrocatalysts for oxygen evolution reduction (OER), although increased stability and prevention of the degradation of their lone pairs would be desirable improvements. In this work, cobalt phosphide (CoP)/BP heterostructures were electrochemically synthesized with a two-electrode system, where cobalt ions were generated in situ at a Co anode, and non-aggregated BP nanosheets (NSs) were exfoliated from the bulky BP cathode. With an electrolysis voltage of 30 V, the CoP/BP heterostructure exhibited a superior and stable OER performance (e. Read More

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Enhanced electrocatalytic oxygen reduction reaction for Fe-N-C by the incorporation of Co nanoparticles.

Nanoscale 2021 Apr 24;13(13):6521-6530. Epub 2021 Mar 24.

School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China.

Oxygen reduction reaction (ORR) catalytic activity can be improved by means of enhancing the synergy between transition metals. In this work, a novel porous Fe-N-C nanostructure containing uniformly dispersed Co nanoparticles (CoNPs) is prepared by an assisted thermal loading method. The as-prepared Co@Fe-N-C catalyst shows enhanced ORR activity with a half-wave potential (E) of 0. Read More

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Copper-Catalyzed 1,1-Boroalkylation of Terminal Alkynes: Access to Alkenylboronates via a Three-Component Reaction.

Org Lett 2021 May 21;23(9):3706-3711. Epub 2021 Apr 21.

Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China.

A copper-catalyzed three-component reaction of terminal alkynes, diazo compounds, and Bpin to prepare trisubstituted alkenylboronates has been developed. This difunctionalization of alkynes selectively occurs at the terminal carbon atom and proceeds via a tandem sequence. The copper catalyst plays dual roles in the whole process, namely, the initial copper-catalyzed cross-coupling and the following copper-catalyzed stereoselective boration reaction. Read More

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Versatile Hollow ZSM-5 Nanoreactors Loaded with Tailorable Metal Catalysts for Selective Hydrogenation Reactions.

ACS Appl Mater Interfaces 2021 May 21;13(17):20524-20538. Epub 2021 Apr 21.

Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260 Singapore.

Zeolites are one of the most commonly used materials in the chemical industry, acting as catalysts or catalyst supports in different applications. Recently, the synthesis and functionalization of hollow zeolites have attracted many research interests, owing to the unique advantages of their hollow morphology. In the development of more sustainable processes, the hollow zeolites are often endowed with additional stability, selectivity, and activity. Read More

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Four 3D Co(ii) MOFs based on 2,4,6-tris(4-pyridyl)-1,3,5-triazine and polycarboxylic acid ligands and their derivatives as efficient electrocatalysts for oxygen reduction reaction.

Dalton Trans 2021 Apr 23;50(14):4904-4913. Epub 2021 Mar 23.

College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, Fujian Normal University, Fuzhou, Fujian 350007, People's Republic of China.

Different aromatic polycarboxylic acids are employed as auxiliary ligands to give rise to structural diversities in Co(ii)-tpt (tpt = 2,4,6-tris(4-pyridyl)-1,3,5-triazine) frameworks. By introducing various secondary aromatic polycarboxylate anions, namely, biphenyl-3,4',5-tricarboxylic acid (Hbpt), 1,3,5-benzenetricarboxylic acid (Hbtc) and 2,6-dimethyl pyridine-3,5-dicarboxylic acid (Hdmdcpy) into the Co(ii)-tpt system (tpt = 2,4,6-tris(4-pyridyl)-1,3,5-triazine), four new complexes [Co(tpt)(Hbpt)]·0.5DMDP (1) (DMDP = N,N' = dimethylpropyleneurea), [Co(btc)(tpt)(HO)]·3HO (2), [Co(btc)(tpt)Cl]·DMDP·1. Read More

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Axial Ligand Coordination Tuning of Electrocatalytic Activity of Iron Porphyrin Electrografted on Carbon Nanotubes for Oxygen Reduction Reaction.

Chemistry 2021 Apr 20. Epub 2021 Apr 20.

East China University of Science and Technology, school of chemistry and molecular engineering, CHINA.

Oxygen reduction reaction (ORR) is essential in many life processes and energy conversion systems. Inspired by enzymatic oxygen activation/reduction processes, it is desirable to design transition metal molecular catalysts as an alternative to noble-metal-Pt-based ORR electrocatalysts in view point of fuel cell commercialization. Herein, we fabricate bio-inspired molecular catalysts electrografted on multiwalled carbon nanotubes (MWCNTs), where iron porphyrin FeF 20 TPP  is coordinated with covalently electrografted axial ligand on the MWCNTs' surface varying from thiophene to imidazole. Read More

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CoOx@Co-NC Catalyst with Dual Active Centers for Enhanced Oxygen Evolution: Breaking Trade-off of Particle Size and Metal Loading.

Chemistry 2021 Apr 19. Epub 2021 Apr 19.

Nanjing University of Science and Technology, School of Environmental and Biological Engineering, 200# Xiaolingwei road, 210094, NANJING, CHINA.

Increasing the metal loading and downsizing the metal particle size are two effective ways to boost the electrochemical performance of catalysts. However, it is difficult to simultaneously increase the metal loading and reduce the particle size since isolated individual atoms are easy to aggregate into nanoparticles when increasing the metal loading. To tackle this contradiction, we report a bottom-up ligand-mediated strategy to facilely prepare ultrafine CoO x  nanoclusters anchored on a Co-N-containing carbon matrix (CoO x @Co-NC). Read More

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Simultaneous sulfidation of Mo and Co oxides supported on Au(111).

Phys Chem Chem Phys 2021 Apr 25;23(14):8403-8412. Epub 2021 Mar 25.

Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.

Here we present the results of a study carried out to investigate the simultaneous sulfidation of Co and Mo oxide nanoparticles on Au(111) as a synthesis strategy to prepare a model catalyst for hydrodesulfurization (HDS). We make use of scanning tunneling microscopy and X-ray photoelectron spectroscopy to track the changes in morphology and chemistry during the synthesis of a mixed Mo and Co oxide precursor and the sulfidation thereafter, to the respective sulfides. We investigated the effects of temperature and the duration of sulfidation on the completeness of the sulfidation process. Read More

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Effect of Different Iron Sources on Growth of Zeolitic Imidazolate Frameworks-8: For Efficient Oxygen Reduction Electrocatalysts.

J Nanosci Nanotechnol 2021 Oct;21(10):5319-5328

Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China.

Transition metal and nitrogen co-doped carbon-based catalysts (TM-N-C) have become the most promising catalysts for Pt/C due to their wide range of sources, low cost, high catalytic activity, excellent stability and strong resistance to poisoning, especially Fe-N-C metal-organic frameworks (MOFs), which are some of the most promising precursors for the preparation of Fe-N-C catalysts due to their inherent properties, such as their highly ordered three-dimensional framework structure, controlled porosity, and tuneable chemistry. Based on these, in this paper, different iron sources were added to synthesis a sort of zeolitic imidazole frameworks (ZIF-8). Then the imidazole salt in ZIF-8 was rearranged into high N-doped carbon by high-temperature pyrolysis to prepare the Fe-N-C catalyst. Read More

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October 2021

Highly Active and Stable Palladium Catalysts on Novel Ceria-Alumina Supports for Efficient Oxidation of Carbon Monoxide and Hydrocarbons.

Environ Sci Technol 2021 Apr 19. Epub 2021 Apr 19.

Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States.

Precious metal catalysts with superior low-temperature activity and excellent thermal stability are highly needed in environmental catalysis field. In this work, a novel two-step incipient wetness impregnation (T-IWI) method was developed for the fabrication of a unique and highly stable CeO/AlO support (CA-T). Pd anchored on CA-T exhibited a much higher low-temperature catalytic activity and superior thermal stability in carbon monoxide (CO) and hydrocarbon (HC) oxidations, compared to Pd anchored on conventional CeO/AlO (CA), which was prepared by a one-step IWI method. Read More

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High-Density Formation of Metal/Oxide Interfacial Catalytic Active Sites through Hybrid Clustering.

ACS Appl Mater Interfaces 2021 Apr 12. Epub 2021 Apr 12.

Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan.

We developed a method for preparing catalysts based on hybrid clusters that formed high-density metal/oxide interfacial active sites. A Ru-V hybrid cluster, [{Ru(cym)}VO] (cym = -cymene), was used as a precursor to prepare Ru-V catalysts. Transmission electron microscopy and X-ray absorption spectroscopy (XAS) analyses revealed that composite nanoparticles of Ru and V were formed through hybrid clustering, while conventional coimpregnation of Ru and V afforded separate nanoparticles. Read More

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Cobalt-Doping of Molybdenum Disulfide for Enhanced Catalytic Polysulfide Conversion in Lithium-Sulfur Batteries.

ACS Nano 2021 Apr 9;15(4):7491-7499. Epub 2021 Apr 9.

Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.

Metal sulfides, such as MoS, are widely investigated in lithium-sulfur (Li-S) batteries to suppress the shuttling of lithium polysulfides (LiPSs) due to their chemical adsorption ability and catalytic activity. However, their relatively low conductivity and activity limit the LiPS conversion kinetics. Herein, the Co-doped MoS is proposed to accelerate the catalytic conversion of LiPS as the Co doping can promote the transition from semiconducting 2H phase to metallic 1T phase and introduce the sulfur vacancies in MoS. Read More

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Foam Silica Films Synthesized by Calcium Chloride-Assisted Emulsification.

Langmuir 2021 Apr 8;37(15):4540-4549. Epub 2021 Apr 8.

Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire des Multimatériaux et Interfaces, F-69622 Villeurbanne, France.

The development of porous films with an accessible high specific surface area is important for designing new adsorbents, sensors, or catalyst supports. Here, we describe a simple method to prepare a silica foam coating using a calcium chloride-assisted evaporation-induced emulsification method. An alcoholic silica sol containing calcium chloride and a poly(ethylene oxide)-based polymer is deposited on a substrate by dipping. Read More

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Ammonia-borane as a Catalyst for the Direct Amidation of Carboxylic Acids.

Org Lett 2021 Apr 7;23(8):2938-2942. Epub 2021 Apr 7.

Herbert C. Brown Center for Borane Research, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States.

Ammonia-borane serves as an efficient substoichiometric (10%) precatalyst for the direct amidation of both aromatic and aliphatic carboxylic acids. generation of amine-boranes precedes the amidation and, unlike the amidation with stoichiometric amine-boranes, this process is facile with 1 equiv of the acid. This methodology has high functional group tolerance and chromatography-free purification but is not amenable for esterification. Read More

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Catalyst-loaded micro-encapsulated phase change material for thermal control of exothermic reaction.

Sci Rep 2021 Apr 6;11(1):7539. Epub 2021 Apr 6.

Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, 060-8628, Japan.

CO methanation is a promising technology to enable the use of CO as a resource. Thermal control of CO methanation, which is a highly active exothermic reaction, is important to avoid thermal runaway and subsequent degradation of the catalyst. Using the heat storage capacity of a phase change material (PCM) for thermal control of the reaction is a novel passive approach. Read More

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Influencing factors and growth kinetics analysis of carbon nanotube growth on the surface of continuous fibers.

Nanotechnology 2021 Apr 20;32(28). Epub 2021 Apr 20.

Shandong Institute of Nonmetallic Materials, Jinan 250031, People's Republic of China.

Carbon nanotubes (CNTs) were continuously grown on the surface of the moving carbon fiber by chemical vapor deposition method using a custom-designed production line to prepare composite reinforcements on a large-scale. The systematic study of different parameters affecting the CNT growth revealed simple growth kinetics, which helps to control the surface morphology and structural quality of CNTs. Since hydrogen maintains the activity of the catalyst, it promotes the growth of CNTs in a continuous process. Read More

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UV-Assisted Li-Catalyzed Radical Grafting Polymerization of Vinyl Ethers: A New Strategy for Creating Hydrolysis-Resistant and Long-Lived Polymer Brushes as a "Smart" Surface Coating.

Langmuir 2021 04 31;37(14):4102-4111. Epub 2021 Mar 31.

Beijing Engineering Research Center of Syntheses and Applications of Waterborne Polymers College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

A facile synthetic route was developed to prepare a surface-grafted brush layer of poly(vinyl ethers) (PVEs) directly by a radical mechanism, with the "naked" Li acting as a catalyst. Density functional theory calculations suggested that complexation of naked Li to VEs significantly reduced the highest unoccupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) energy gap from 5.08 to 0. Read More

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N and O multi-coordinated vanadium single atom with enhanced oxygen reduction activity.

J Colloid Interface Sci 2021 Jul 18;594:466-473. Epub 2021 Mar 18.

Department of Materials Science & Engineering, University of Science and Technology of China, Jinzhai Road NO.96, Hefei, Anhui 230026, PR China; The Anhui High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China. Electronic address:

Recently, atomically dispersed transition-metal single atom in nitrogen-doped carbon matrix as electrocatalysts has aroused general interest. However, there is no report about vanadium single atom for ORR in the literature. According to d-band center theory for transition-metals, the performance of catalysts is regulated by the electronic structure of the catalytic center which determines the intermediate adsorption kinetics. Read More

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Low-Loading and Highly Stable Membrane Electrode Based on an Ir@WONR Ordered Array for PEM Water Electrolysis.

ACS Appl Mater Interfaces 2021 Apr 24;13(13):15073-15082. Epub 2021 Mar 24.

Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

Developing cheap and stable membrane electrode assembly for proton exchange membrane water electrolysis (PEMWE) plays critical roles in renewable energy revolution. Iridium is the commonly efficient oxygen evolution reaction catalyst. But the reserve in earth is a shortage. Read More

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Dye-Sensitized Nonstoichiometric Strontium Titanate Core-Shell Photocathodes for Photoelectrosynthesis Applications.

ACS Appl Mater Interfaces 2021 Apr 21;13(13):15261-15269. Epub 2021 Mar 21.

Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.

A core-shell approach that utilizes a high-surface-area conducting core and an outer semiconductor shell is exploited here to prepare p-type dye-sensitized solar energy cells that operate with a minimal applied bias. Photocathodes were prepared by coating thin films of nanocrystalline indium tin oxide with a 0.8 nm AlO seeding layer, followed by the chemical growth of nonstoichiometric strontium titanate. Read More

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