The decomposition of mixed oxide Ag2Cu2O3: Structural features and the catalytic properties in CO and C2H4 oxidation

2018 ◽  
Vol 427 ◽  
pp. 363-374 ◽  
Author(s):  
Dmitry A. Svintsitskiy ◽  
Tatyana Yu. Kardash ◽  
Elena M. Slavinskaya ◽  
Olga A. Stonkus ◽  
Sergei V. Koscheev ◽  
...  
Keyword(s):  
Mixed Oxide ◽  
Catalytic Properties ◽  
Structural Features ◽  
C2h4 Oxidation

scholarly journals Controlled growth of ultrafine metal nanoparticles mediated by solid supports

2021 ◽  
Vol 3 (7) ◽  
pp. 1865-1886
Author(s):  
Hongyin Hu ◽  
Shuanglong Lu ◽  
Ting Li ◽  
Yue Zhang ◽  
Chenxi Guo ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Catalytic Properties ◽  
Structural Features ◽  
Controlled Growth ◽  
Solid Supports ◽  
Ultrafine Metal ◽  
Different Types

This article reviews the controlled growth of UMNPs mediated by different types of solid supports and their catalytic properties. The importance of certain structural features of the supports is also discussed.

scholarly journals Novel class of glutathione transferases from cyanobacteria exhibit high catalytic activities towards naturally occurring isothiocyanates

2007 ◽  
Vol 406 (1) ◽  
pp. 115-123 ◽  
Author(s):  
Eric Wiktelius ◽  
Gun Stenberg
Keyword(s):  
Catalytic Properties ◽  
Structural Features ◽  
Glutathione Transferases ◽  
Substrate Specificities ◽  
Catalytic Activities ◽  
Genome Databases ◽  
Naturally Occurring ◽  
Physiological Relevance ◽  
Associated Proteins

In the present paper, we report a novel class of GSTs (glutathione transferases), called the Chi class, originating from cyanobacteria and with properties not observed previously in prokaryotic enzymes. GSTs constitute a widespread multifunctional group of proteins, of which mammalian enzymes are the best characterized. Although GSTs have their origin in prokaryotes, few bacterial representatives have been characterized in detail, and the catalytic activities and substrate specificities observed have generally been very modest. The few well-studied bacterial GSTs have largely unknown physiological functions. Genome databases reveal that cyanobacteria have an extensive arsenal of glutathione-associated proteins. We have studied two cyanobacterial GSTs which are the first examples of bacterial enzymes that are as catalytically efficient as the best mammalian enzymes. GSTs from the thermophile Thermosynechococcus elongatus BP-1 and from Synechococcus elongatus PCC 6301 were found to catalyse the conjugation of naturally occurring plant-derived isothiocyanates to glutathione at high rates. The cyanobacterial GSTs studied are smaller than previously described members of this enzyme family, but display many of the typical structural features that are characteristics of GSTs. They are also active towards several classical substrates, but at the same moderate rates that have been observed for other GSTs derived from prokaryotes. The cloning, expression and characterization of two cyanobacterial GSTs are described. The possible significance of the observed catalytic properties is discussed in the context of physiological relevance and GST evolution.

On the NiO, MoO3 mixed oxide correlation between preparative procedures thermal activation and catalytic properties

1993 ◽  
Vol 63-65 ◽  
pp. 731-735 ◽  
Author(s):  
C MAZZOCCHIA ◽  
A KADDOURI ◽  
R ANOUCHINSKY ◽  
M SAUTEL ◽  
G THOMAS
Keyword(s):  
Mixed Oxide ◽  
Thermal Activation ◽  
Catalytic Properties

Studies of Physicochemical and Catalytic Properties of Mixed Oxide CuO-Fe2O3-Al2O3 for Reactions of Deep Oxidation

2017 ◽  
Vol 17 (4) ◽  
pp. 315-323 ◽  
Author(s):  
A. V. Fedorov ◽  
D. Yu. Ermakov ◽  
V. V. Kaichev ◽  
J. A. Bulavchenko ◽  
V. A. Yakovlev
Keyword(s):  
Mixed Oxide ◽  
Catalytic Properties ◽  
Deep Oxidation

Characterization and catalytic properties of molybdenum oxide catalysts supported on ZrO2–γ-Al2O3 for ammoxidation of toluene

RSC Advances ◽  
2014 ◽  
Vol 4 (71) ◽  
pp. 37679-37686 ◽  
Author(s):  
Abbas Teimouri ◽  
Bahareh Najari ◽  
Alireza Najafi Chermahini ◽  
Hossein Salavati ◽  
Mahmoud Fazel-Najafabadi
Keyword(s):  
Molybdenum Oxide ◽  
Mixed Oxide ◽  
Catalytic Properties ◽  
Oxide Catalysts ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Wet Impregnation Method

Molybdenum oxide catalysts with MoO3 loadings ranging from 6.6 to 25 wt% supported on ZrO2–γ-Al2O3 (1 : 1 wt%) mixed oxide were prepared by a wet impregnation method.

scholarly journals Effect of Li2O Doping on the Surface and Catalytic Properties of the Fe2O3–NiO/Al2O3 System

1998 ◽  
Vol 16 (1) ◽  
pp. 21-32 ◽  
Author(s):  
G.A. El-Shobaky ◽  
A.M. Ghozza ◽  
N.M. Deraz
Keyword(s):  
Activation Energy ◽  
Catalytic Activity ◽  
Mixed Oxide ◽  
Active Sites ◽  
Catalytic Properties ◽  
Surface Characteristics ◽  
Appreciable Change ◽  
Surface Areas ◽  
Catalytically Active ◽  
Specific Surface Areas

Ferric–nickel/aluminium mixed oxide solids have the formula Fe2O3–0.42NiO/Al2O3 were treated with Li2O (0.75–3 mol%) and heated in air for 4 h at 500°C and 800°C, respectively. The effects of this treatment on the surface characteristics of these solids and their catalytic properties in relation to CO oxidation by O2 have been investigated. The results reveal that Li2O doping at 0.75 mol% concentration resulted in an increase of 24% and 18%, respectively, in the value of the specific surface areas, SBET, of the solids precalcined at 500°C and 800°C, while the addition of 3 mol% Li2O led to a slight decrease of ca. 10% in the SBET value of the same solids. In contrast, irrespective of whether the doping process involved solids precalcined at 500°C or 800°C, a significant decrease of 37% and 78%, respectively, was observed in the catalytic activity of these materials. This decrease in catalytic activity was not accompanied by any appreciable change in the magnitude of the activation energy for the catalytic reaction, i.e. Li2O doping brings about a decrease in the concentration of catalytically active sites without changing their energetic nature.

Relevance of the Co1−xNixWO4 wolframite-type mixed oxide compositions on the synthesis and catalytic properties of W-based carbides

2005 ◽  
Vol 238 (1-2) ◽  
pp. 127-134 ◽  
Author(s):  
Sergio L. González-Cortés ◽  
Tian-Cun Xiao ◽  
Pedro M.F.J. Costa ◽  
Serbia M.A. Rodulfo-Baechler ◽  
Malcolm L.H. Green
Keyword(s):  
Mixed Oxide ◽  
Catalytic Properties

Mechanistic insights into defect chemistry and tailored photo-luminescent and photo-catalytic properties of aliovalent cations substituted Zn0.94M0.06-x LixO (M: Fe3+, Al3+, Cr3+) nanoparticles

2021 ◽  
Author(s):  
Sajid A Ansari ◽  
C. Manjunatha ◽  
Nazish Parveen ◽  
SHIVRAJ BW ◽  
Hari Krishna Rajan
Keyword(s):  
Combustion Synthesis ◽  
Catalytic Properties ◽  
Solution Combustion Synthesis ◽  
Structural Features ◽  
Defect Chemistry ◽  
Photocatalytic Properties ◽  
Solution Combustion ◽  
Microwave Assisted ◽  
Photo Luminescent

In this work, we demonstrate the microwave assisted solution combustion synthesis of aliovalent cations substituted Zn0.94M0.06-xLixO (M: Fe3+, Al3+, Cr3+) nanoparticles. The structural features, photoluminscent and photocatalytic properties were characterized...

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