Topics in Catalysis

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Dioxygen at Biomimetic Single Metal-Atom Sites: Stabilization or Activation? The Case of CoTPyP/Au(111)
Topics in Catalysis - Tập 63 Số 15-18 - Trang 1585-1595 - 2020
Francesco Armillotta, A. Pividori, Matuš Stredansky, Nicola Seriani, Vitaliy Feyer
AbstractBy means of a combined experimental and computational approach, we show that a 2D metal–organic framework self-assembled at the Au(111) termination is able to mimic the O2 stabilization and activation mechanisms that are typical of the biochemical environment of proteins and enzymes. 5,10,15,20-tetra(4-pyridyl)21H,23H-porphyrin cobalt(III) chloride (CoTPyP) molecules on Au(111) bind dioxyg... hiện toàn bộ
Doping a Single Palladium Atom into Gold Superatoms Stabilized by PVP: Emergence of Hydrogenation Catalysis
Topics in Catalysis - Tập 61 - Trang 136-141 - 2017
Shun Hayashi, Ryo Ishida, Shingo Hasegawa, Seiji Yamazoe, Tatsuya Tsukuda
It is known that small gold clusters (average diameter: ~ 1.2 nm) stabilized by poly(N-vinyl-2-pyrrolidone) (Au:PVP) exhibit size-specific catalysis in aerobic oxidation reactions. A recent matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) study of Au:PVP revealed that Au clusters with the magic sizes of 34 and 43 were preferentially produced. Here, we reported how the dopin... hiện toàn bộ
On the Synergy Effect in MoO3–Fe2(MoO4)3 Catalysts for Methanol Oxidation to Formaldehyde
Topics in Catalysis - Tập 50 - Trang 145-155 - 2008
Emma Söderhjelm, Matthew P. House, Neil Cruise, Johan Holmberg, Michael Bowker, Jan-Olov Bovin, Arne Andersson
Methanol oxidation to formaldehyde was studied over a series of Fe–Mo–O catalysts with various Mo/Fe atomic ratio and the end compositions Fe2O3 and MoO3. The activity data show that the specific activity passes through a maximum with increase of the Mo content and is the highest for Fe2(MoO4)3. The selectivity to formaldehyde, on the other hand, increases with the Mo content in the catalyst. A sy... hiện toàn bộ
Photocatalytic Activity of AgBr as an Environmental Catalyst
Topics in Catalysis - Tập 56 - Trang 618-622 - 2013
Bungaku Kobayashi, Ryo Yamamoto, Hironobu Ohkita, Takanori Mizushima, Akira Hiraishi, Noriyoshi Kakuta
The photocatalytic activity of AgBr has been investigated. AgBr(N2) was prepared by solid(AgNO3)–solid(KBr) reaction at different temperatures in a stream of N2. AgBr(N2) prepared at 250 °C showed the highest H2 generation activity although the larger crystallites of Ag were observed. When the preparation was carried out under air [AgBr(air)] at 250 °C, the photoactivity and the crystallization of... hiện toàn bộ
Isotope Effect of Hot Electrons Generated on Pt Nanoparticle Surfaces Under H2 and D2 Oxidation
Topics in Catalysis - Tập 61 - Trang 915-922 - 2018
Hyosun Lee, Ievgen I. Nedrygailov, Si Woo Lee, Jeong Young Park
Hot electrons are generated when an exothermic chemical reaction takes place on the surface of a metal catalyst. Detection of these electrons using a catalytic nanodiode based on a metal-semiconductor Schottky junction can shed light on the mechanisms for energy transfer between the reacting molecules and the catalyst. Here, we present a study on the isotope effect of hot electron generation durin... hiện toàn bộ
Reaction pathway of benzonitrile formation during toluene ammoxidation on vanadium phosphate catalysts
Topics in Catalysis - Tập 3 - Trang 377-386 - 1996
A. Martin, H. Berndt, B. Lücke, M. Meisel
The reaction pathway of the ammoxidation of toluene on (VO)2P2O7 used as catalyst and the interaction of potential intermediates with the pyrophosphate were studied by spectroscopic techniques (FTIR, EPR), temperature-programmed chemisorptions/ reactions (TPD, TPRS) and transient studies such as the temporal analysis of products (TAP) technique. NH3 is chemisorbed on the catalyst surface, forming ... hiện toàn bộ
Observations on the Aging Environment Dependent NO Oxidation Activity of Model Pt/Al2O3 Diesel Oxidation Catalyst
Topics in Catalysis - - 2013
Santhosh Kumar Matam, Alexander Winkler, Anke Weidenkaff, Davide Ferri
Nanostructured Functionalised Niobium Oxide as Chemoselective Catalyst for Acetalation of Glucose
Topics in Catalysis - Tập 65 - Trang 1994-2004 - 2022
Sahil Kumar, Kanika Saini, Shunmugavel Saravanamurugan, Xiaolei Zhang, Sushil Kumar Kansal
Developing a chemoselective catalyst for the acetalation of biomass-derived glucose to alkyl glycosides has been recognised as an emerging field due to its wide range of applications. The present study focuses on synthesising sulfate functionalised niobium oxide-based (NbOx-DS) catalyst to introduce medium/strong acidic sites that contribute to the catalytic activity towards glucose acetalation, w... hiện toàn bộ
Site requirements in the kinetics of alkane transformations catalysed by metals
Topics in Catalysis - - 2006
F. Garin
Electrochemical promotion of catalysis controlled by chemical potential difference across a mixed ionic-electronic conducting ceramic membrane – an example of wireless NEMCA
Topics in Catalysis - Tập 44 - Trang 435-449 - 2007
D. Poulidi, A. Thursfield, I. S. Metcalfe
A La0.6Sr0.4Co0.2F0.8O3 mixed ionic electronic conducting (MIEC) membrane was used in a dual chamber reactor for the promotion of the catalytic activity of a platinum catalyst for ethylene oxidation. By controlling the oxygen chemical potential difference across the membrane, a driving force for oxygen ions to migrate across the membrane and backspillover onto the catalyst surface is established. ... hiện toàn bộ
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