*  Catalysts | Free Full-Text | Preparation of Pd-Diimine@SBA-15 and Its Catalytic Performance for the Suzuki Coupling Reaction
A highly efficient and stable Pd-diimine@SBA-15 catalyst was successfully prepared by immobilizing Pd onto diimine-functionalized mesoporous silica SBA-15. With the help of diimine functional groups grafted onto the SBA-15, Pd could be anchored on a support with high dispersion. Pd-diimine@SBA-15 catalyst exhibited excellent catalytic performance for the Suzuki coupling reaction of electronically diverse aryl halides and phenylboronic acid under mild conditions with an ultralow amount of Pd (0.05 mol % Pd). When the catalyst amount was increased, it could catalyze the coupling reaction of chlorinated aromatics with phenylboronic acid. Compared with the catalytic performances of Pd/SBA-15 and Pd-diimine@SiO2 catalysts, the Pd-diimine@SBA-15 catalyst exhibited higher hydrothermal stability and could be repeatedly used four times without a significant decrease of its catalytic activity.
  http://www.mdpi.com/2073-4344/6/12/181
*  Molecules | Free Full-Text | Design and Use of Nanostructured Single-Site Heterogeneous Catalysts for the Selective...
Nanostructured single-site heterogeneous catalysts possess the advantages of classical solid catalysts, in terms of easy recovery and recycling, together with a defined tailored chemical and steric environment around the catalytically active metal site. The use of inorganic oxide supports with selected shape and porosity at a nanometric level may have a relevant impact on the regio- and stereochemistry of the catalytic reaction. Analogously, by choosing the optimal preparation techniques to obtain spatially isolated and well-characterised active sites, it is possible to achieve performances that are comparable to (or, in the most favourable cases, better than) those obtained with homogeneous systems. Such catalysts are therefore particularly suitable for the transformation of highly-functionalised fine chemicals and some relevant examples where high chemo-, regio- and stereoselectivity are crucial will be described.
  http://mdpi.com/1420-3049/15/6/3829
*  Oxidation Catalysts Manufacturers, Suppliers & Exporters in India
Search Indian Oxidation Catalysts Manufacturers and Suppliers Details - Contact to Oxidation Catalysts Exporters in India, Oxidation Catalysts Wholesalers, Oxidation Catalysts Distributors and Traders from India.
  http://www.indianyellowpages.com/india/manufacturers/o/oxidation-catalysts.htm
*  Novel Bi<sub>2</sub>S<sub>3</sub>/TiO<sub>2</sub> Heterogeneous Catalyst: Photocatalytic Mechanism for Decolorization of...
Novel Bi2S3/TiO2 Heterogeneous Catalyst: Photocatalytic Mechanism for Decolorization of Texbrite Dye and Evaluation of Oxygen Species - Heterogeneous;Sonochemical;Visible light;$Bi_2S_3$;DPCO;
  http://www.koreascience.or.kr/article/ArticleFullRecord.jsp?cn=SRMHB8_2016_v53n1_56
*  M(C6H16N3)2(VO3)4 as heterogeneous catalysts. Study of three new hybrid vanadates of cobalt(II), nickel(II) and copper(II) with...
Three new hybrid vanadates have been synthesized under hydrothermal conditions with the formula M(C6H16N3)2(VO3)4, where M= Co(II), Ni(II) and Cu(II). The structural analyses show that the phases are isostructural and crystallize in the monoclinic space group P21/c. These compounds show a two-dimensional crystal structure, with sheets composed of [VO3] chains and metal centres octahedrically coordinated, chelated by two 1(2-aminoethyl)pyperazonium ligands. The thermal study reveals that copper containing phase is less stable than cobalt and nickel containing ones. The IR spectra of the three phases are very similar, with little differences in the inorganic bond region of the copper containing phase. The UV-visible spectra show that the cobalt(II) and the nickel(II) are in slightly distorted octahedral environments. The catalytic tests show that the phases act as heterogeneous catalysts for the selective oxidization of alkyl aryl sulfides, with both H2O2 and tert-butylhydroperoxide as ...
  https://addi.ehu.es/handle/10810/18169
*  Copper nanoparticles grafted on carbon microspheres as novel heterogeneous catalysts and their application for the reduction of...
Catalysis is at the heart of chemical transformations; therefore, there are continuous efforts to develop new catalysts and increase catalytic performance for various applications. Metallic nanoparticles (NPs) have become essential tools for many chemical processes employed in industry and academia during recent decades.1-5 NPs possess high specific surface area, various shapes and sizes, and high reactivity, and they often exhibit activity different from that of the corresponding bulk materials, due to their distinctive quantum properties. Handling of NPs, however, is not easy, because NPs are often prone to self-aggregation, and it is difficult to separate them from reaction media because the classical, convenient filtration methods are not applicable. One economical way to overcome or minimise these limitations is to anchor NPs on supports, with the latter also serving as modifiers of catalytic properties. Nowadays, economic considerations and health issues are gaining ...
  http://pubs.rsc.org/en/content/articlehtml/2018/nj/c7nj03562d
*  Catalysing for success This presentation will discuss what catalysts are, their mechanisms of action and their significance to...
Introduction. Catalysis-catalysing for success Catalysing for success This presentation will discuss what catalysts are, their mechanisms of action and their significance to the chemical industry. Introduction Catalysis is a remarkable phenomenon. Quite apart from the scientific reality, the financial and environmental benefits of harnessing its power are very impressive. Catalysts in definition developed by scientists in the last century, are materials that change the rate of attainment of equilibrium without themselves being changed or consumed in the process. To illustrate the importance of catalysis, here are some of the many applications of it: Chemical and materials manufacturing, Fuel cells, Combustion devices, Pollution control systems, Laundry detergents. The mechanisms of catalytic action in some of the above applications will be discussed later. Types of Catalyst There are two types of catalyst: ...
  http://www.markedbyteachers.com/as-and-a-level/science/catalysing-for-success-this-presentation-will-discuss-what-catalysts-are-their-mechanisms-of-action-and-their-significance-to-the-chemical-industry-introduction.html
*  Brevet US3536457 - Catalytic oxidation unit for domestic oven exhaust - Google Brevets
2 Sheets-Sheet 1 w. L. HENDERSON I CATALYTIC OXIDATION UNIT FOR DOMESTIC OVEN EXHAUST Oct. 27,1970 Filed Feb WAYNE L. HENDERSON ms ATTORNEY Oct. 27 41970 w, HENDERSON 3,536,?!- CATALYTIC OXIDATION UNIT FOR DOMESTIC-OVENBXIIAUST Filed Feb. 21, 1968 2 shms snm a was I F'IG.4 . l I I l I I I I I I I I I o "5 l 3o 4o so 6o INVENTOIL WAYNE L. neuoaasou HIS ATTORNEY United States Patent US. Cl. 23-288 2 Claims ABSTRACT OF THE DISCLOSURE A catalytic oxidation unit useful in eliminating smoke and odors issuing from the exhaust vent of a domestic cooking oven, particularly a high temperature, selfcleaning oven using a pyrolytic process for degrading food soils. The oxidation unit comprises a hollow housing supporting a plurality of catalyst coated gas burners of cellular ceramic construction and having a high surface-tovolume ratio. The housing has an intake port and an exhaust port and includes a partition which separates the housing into intake and afterburner compartments; with the gas flow being ...
  http://www.google.fr/patents/US3536457
*  Tridentate ligand-containing metal catalyst complexes for olefin polymerization - Patent # 6294495 - PatentGenius
An activated tridentate-, monoanionic-ligand-based transition metal catalyst in a reduced oxidation state for olefin polymerization is disclosed. Transition metal catalyst precursors for these catalysts have the formulae: ##STR1##in which M is a transition metal from Groups 4-9 in a reduced oxidation state, X is a mono anionic ligand, L is a neutral donor group, E is a neutral donor group from Groups 15 and 16, E' is a monoanionic donor group from Group 15, T is a bridging group, n is 1-3 as needed to balance the charge on M, p is 0-3 and q is 1-2. Olefin polymerization is exemplified.
  http://www.patentgenius.com/patent/6294495.html
*  New Technology for Selective Catalytic Oxidation of Ammonia To Nitrogen » Brill Online
The selective catalytic oxidation (SCO) of ammonia to N2 was studied by using a series of noble metal-V2O5-WO3 catalysts supported on titania-silica (TS) prepared by coprecipitation method. In the V2O5- WO3 catalyst system, the use of TS as a support was very effective to enhance catalytic activity compared with TiO2 or SiO2 alone. The addition of a slight amount of Pd and Ir to V2O5-WO3/TS catalyst caused also remarkable enhancement of the catalytic activity without decreasing the selectivity to N2. The present catalysts provide remarkably high catalytic performance for SCO of ammonia to N2 under the practical reaction conditions for an industrial application.
  http://booksandjournals.brillonline.com/content/journals/10.1163/156856798x00726
*  Creative Enzymes Tells You What Enzyme Catalysis Is | Hope Tribune
Enzyme catalysis can be regarded as a catalytic reaction between homogeneous and heterogeneous reactions. It can be seen as the reaction between the enzyme and the reaction for formation of intermediate compounds, and it can also be seen as the reaction after the surface of the enzyme adsorbs the reactant.. What are enzymes?. It is an organic colloidal substance composed of protein. It plays a catalytic role for biochemical reactions.. Fermentation also is finished by its role of protease enzyme.. Enzyme catalysis. Accelerating or slowing down a chemical reaction by enzymes is called enzyme catalysis. Hundreds of different reactions performing simultaneously in a living cell are accomplished by a considerable number of enzymes. In many cases, small structural changes in the substrate molecule will make the compound loss the ability to act as a substrate.. Features. Enzyme ...
  http://www.hopetribune.com/story/100767/creative-enzymes-tells-you-what-enzyme-catalysis-is.html
*  Trienamines: Their Key Role in Extended Organocatalysis for Diels-Alder Reactions - Asymmetric Catalysis - Tom 1, Numer 1 (2013...
For a seminal work in HOMO activation via enamineintermediates, see: a) List B., Lerner R. A., Barbas III C. F. J.,Proline-Catalyzed Direct Asymmetric Aldol Reactions, J. Am.Chem. Soc., 2000, 122, 2395-2396. For a review in enamineactivation, see: b) Mukherjee S., Yang J. W., Hoffmann S.,List B., Asymmetric Enamine Catalysis, Chem. Rev. 2007,107, 5471-5569. For a seminal work in HOMO-activation viadienamine intermediates, see: c) Bertelsen S., Marigo M.,Brandes S., Dinér P., Jørgensen K. A., Dienamine Catalysis:Organocatalytic Asymmetric γ-Amination of α,β-UnsaturatedAldehydes, J. Am. Chem. Soc. 2006, 128, 12973-12980.For reviews in dienamine activation, see: d) Ramachary D. B.,Reddy Y. V., Dienamine Catalysis: An Emerging Technologyin Organic Synthesis, Eur. J. Org. Chem., 2012, 865-887. e)Parra A., Reboredo S., Alemán J., Asymmetric Synthesis ofCyclobutanes by a Formal [2+2] Cycloaddition Controlled ...
  http://yadda.icm.edu.pl/yadda/element/bwmeta1.element.-psjd-doi-10_2478_asorg-2013-0001
*  Inorganic - Page 3 - Rodrigo Ortiz Book Archive
Winning commercial heterogeneous catalysts satisfy numerous key require- ments: as well as excessive catalytic task for the specified response, with excessive selectivity the place applicable, in addition they have a suitable advertisement existence and are rugged sufficient for transportation and charging into plant reactors. extra requisites contain the necessity to come on-line easily very quickly and reproducible production approaches that contain handy methods at appropriate expense. the advance of heterogeneous catalysts that meet those (often at the same time unique) calls for is much from basic, and likewise a lot of the particular production tech- nology is stored mystery for advertisement reasons-thus there's no smooth textual content that offers with the full of this significant topic. rules of Catalyst improvement, which offers comprehensively with the layout, improvement, and manufacture of functional heterogeneous catalysts, is for this reason ...
  http://latrituradora.com/index.php/library/category/inorganic/page/3
*  Investigations in cooperative catalysis: synthesis, reactivity and metal-ligand bonding :: University of Southern California...
Research presented in this work describes investigations into the synthesis, structure, and reactivity of cooperative catalysts. Cooperative catalysis, the concept of actively involving ligands in catalytic transformations, is used extensively in enzymatic systems and has been shown to enable organometallic catalysts to realize improved enantioselectivity, chemoselectivity, or activation of otherwise unreactive bonds. Two types of cooperative catalysts are investigated in this work: non-innocent ligands and ligand-based directing groups. Initial investigations detailed in this work revolve around a catalyst of the first type: Shvo's catalyst ({[Ph₄(η⁵-C₄CO)]₂H]}Ru₂(CO)₄(μ-H)) which is known for containing a non-innocent cyclopentadienone ligand. Shvo's catalyst is shown to be a competent catalyst for alkylation of amines with alcohols and amines and is superior to other reported catalysts in some cases. Subsequent studies investigated the potential of Shvo's catalyst to ...
  http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/285301/rec/8
*  Solid acids with SO3H groups and tunable surface properties
Acid catalysis plays an important role in biomass conversion processes for producing chemicals and fuels. We report a relatively simple procedure for synthesizing versatile, strong acid catalysts based on carbon and carbon-silica composites with sulfonic acid groups. The process involves chemical activation of a sulfonic acid organic precursor at low temperature. The synthesis conditions can be modified to tune the surface composition, texture, and the acid properties of the materials towards superior catalytic performances. Molecular level insights into the nature and strength of the acid sites were gained by combining high resolution XPS and 1H-decoupled 31P MAS NMR spectroscopy of adsorbed triethylphosphine oxide. These materials are effective acid catalysts for the conversion of different biomass-derived chemicals to useful bio products such as furanic ethers and levulinate esters ...
  https://edoc.hu-berlin.de/handle/18452/14254
*  Über die Performance der heterogen katalysierten Partialoxidation von Acrolein zu Acrylsäure an modifizierten Mo/V/W...
Mo/V/W based mixed oxides are known heterogeneous catalysts for the selective oxidation of Acrolein to Acrylic acid. A peculiarity is the influence of water on the catalysts performance. An addition of water vapor increases yield and conversion. Motivation of this work was the question, whether the usage of the hydrothermal preparation method can improve the catalytical performance and whether the water effect persists. Three catalyst samples were created using two different preparation methods. The samples were analyzed with respect for their solid state properties and catalytic performance. It was found that the hydrothermal preparation generates catalysts with significant higher surface area and activity. The observed differences in activity result from the higher specific surface area as well as from a higher density of active sites. Moreover TP-experiments in presence of water showed the activity-enhancing effect of steam, regardless of the used preparation method. As main cause, the ...
  http://tuprints.ulb.tu-darmstadt.de/3299/
*  Synthesis and oxygen evolution reaction (OER) catalytic performance of Ni2−xRuxP nanocrystals: enhancing activity by dilution...
Aiming to create an efficient, less-expensive catalyst for the oxygen evolution reaction (OER), a synthetic protocol is developed to prepare ternary metal phosphide nanoparticles, Ni2−xRuxP, incorporating Ru, a traditional catalyst for OER, and Ni, a highly active but inexpensive metal. Using solution-phase
  http://pubs.rsc.org/en/content/articlelanding/2017/ta/c7ta05353c
*  Heterogeneous catalysis for fine chemicals - Catalysis Science & Technology (RSC Publishing)
Welcome to this themed issue of Catalysis Science & Technology entitled 'Heterogeneous catalysis for fine chemicals'. Heterogeneous catalysis for fine chemicals
  http://pubs.rsc.org/en/content/articlelanding/2011/cy/c1cy90035h
*  "In Situ IR Spectroscopic Investigation of Noble Metal Catalysts Relate" by Zhiyong Wang
The reduction of automotive exhaust emissions has been one of the hottest topics in catalysis community since 1970s. Thanks to the development of three-way catalysts, main auto-exhaust pollutants, such as carbon monoxide, nitrogen oxides and unburned hydrocarbons, can be removed simultaneously. Nowadays, diesel engines and lean-engines become more and more popular due to their high fuel-efficiency and low CO2 emissions. Unfortunately, conventional three-way catalysts are not effective at reducing the NOx emissions from these engines due to the excess oxygen in the exhaust stream. Platinum catalysts were found to be highly active for selective NO reduction with hydrocarbons in excess oxygen and has good thermal stability and sulfur resistance. However, discrepancies still exist in the reaction mechanism of NO reduction with hydrocarbons on platinum catalysts. In this thesis, fundamental surface science studies were performed with in situ IR spectroscopic techniques combined ...
  https://scholarcommons.sc.edu/etd/3194/
*  Compatibility of NOx and PM Abatement in Diesel Catalysts - SAE International
Stringent new emission regulations pose challenges for the development of diesel catalyst technology. Future 4-way catalyst technology must provide for the simultaneous control of CO, HC, NOx and particulate matter (PM). Since NOx abatement is a reduction process while control of CO, HC and PM emissions requires catalytic oxidation, it is difficult to simultaneously control all four regulated pollutants under the oxidizing conditions found in diesel exhaust. New catalysts for lean NOx control have been developed for systems that operate with injection of reductant (active systems) and without injection of reductant (passive systems).In this study, two experimental catalysts which have potential as lean NOx catalysts, Pt/ZSM-5 and an Ir catalyst, were evaluated under both passive and active conditions. Conditions required for simultaneous PM and NOx abatement are discussed for a lean NOx + a conventional diesel oxidation catalyst (DOC) system. It was found that a Pt/ZSM-5 catalyst with mild HC ...
  http://papers.sae.org/980931/
*  Catalysis Letters - Springer
Catalysis Letters is an international journal devoted to the development of catalysis and to providing a platform for the exchange of seminal ideas and advances in heterogeneous, homogeneous, and bio-related catalysis. Our aim is to stimulate the cross-fertilization of ideas in order to bring the various sub-disciplines closer together and to facilitate the rapid dissemination of frontier research.. In addition to original research papers, the journal also publishes Perspective articles and Editorials authored by leading experts on the topic which focus attention on important issues and developments within the catalysis field. Topical collections in the area of catalysis are published in our sister journal Topics in Catalysis. The journal publishes twenty themed issues per year edited by an ...
  https://link.springer.com/journal/10562?wt_mc=springer.banner.FTA2012-10562
*  Preparation and Microstructural Characterization of Pt-Pd Bimetallic Catalysts Supported on TiO2.
Nanoparticles, specially metallic nanoparticles finely dispersed onto high surface area supports, play an important role in heterogeneous catalysis because the performance of a supported metal catalyst can be related to design, which is most crucial for the development of novel catalytic processes. It requires some understanding of the mechanism of the catalytic reaction, and knowledge of the crucial properties which determine the activity, selectivity and lifetime of the catalyst. Studies of the interrelationship between structural and chemical properties of solid materials and their catalytic properties. These studies are frequently carried out using specially prepared model catalysts which are amenable to analysis with modern surface analytical methods providing structural and chemical information on molecular scale, as TEM attach with X-EDS. Various techniques and concepts of solid state and surface chemistry are applied for modifying and synthesizing ...
  http://www.nsti.org/procs/Nanotech2003v3/4/T55.07
*  KAKEN - Research Projects | Development of highly effective catalyst for Beckmann rearrangement (KAKENHI-PROJECT-06453101)
Principal Investigator:YASHIMA Tatsuaki, Project Period (FY):1994 - 1995, Research Category:Grant-in-Aid for General Scientific Research (B), Research Field:触媒・化学プロセス
  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06453101/
*  Protein Catalysis - Herschlag Lab
Whereas enzymes are widely renowned for the exquisite specificity, we showed that enzymes also have low levels of catalysis for alternative reactions, an observation we described as 'catalytic promiscuity'.. Catalytic promiscuity has been a key driver in the evolution of new enzymes, providing a head start and selective advantage for enzymes already possessing a low level of advantageous activity.. Catalytic promiscuity provides a powerful tool for addressing evolutionary and mechanistic questions. We are exploiting catalytic promiscuity across an enzyme superfamily to gain an understanding of the fundamental underpinnings of catalysis. Unlike traditional site-directed mutagenesis, experiments that are often limited to studying a single reaction catalyzed by an individual enzyme, we are using a comparative approach to ask not simply what the consequence is of removing a particular side chain, but how that removal and change in the side chain ...
  http://herschlaglab.stanford.edu/protein-catalysis
*  Synthesis of 5-substituted 1H-tetrazoles using a nano ZnO/Co3O4 catalyst - Catalysis Science & Technology (RSC Publishing)
Zinc salts have catalytically active sites suitable for synthesis of substituted 1H-tetrazoles. Herein we report the synthesis of 5-substituted 1H-tetrazoles catalyzed by nano ZnO/Co3O4. This is a novel heterogeneous catalyst which showed excellent efficiency, affording good to excellent yield of products.
  http://pubs.rsc.org/en/Content/ArticleLanding/2012/CY/C2CY20094E