Catalysts of ceria supported on copper-chromium oxide: Ceria promotion of the CO-PROX activity

2021 ◽  
Author(s):  
A. Elmhamdi ◽  
L. Pascual ◽  
M. Retuerto ◽  
A. Martínez-Arias
Keyword(s):  
Chromium Oxide ◽  
Copper Chromium

HYDROGENOLYSIS OF CARBOHYDRATES: V. ISOMERIZATION OF METHYL β-L-ARABOPYRANOSIDE

1958 ◽  
Vol 36 (6) ◽  
pp. 921-925 ◽  
Author(s):  
A. S. Perlin ◽  
E. Von Rudloff ◽  
A. P. Tulloch
Keyword(s):  
Chromium Oxide ◽  
Oxide Catalyst ◽  
Starting Material ◽  
Reaction Conditions ◽  
Copper Chromium ◽  
Cis And Trans

Treatment of methyl β-L-arabopyranoside under hydrogenolytic conditions with copper chromium oxide catalyst induces extensive isomerization. Products formed include glycosides of D-ribose, D-xylose, D-lyxose, and L-lyxose which together represent about an 80–90% conversion of starting material. Isolation of these compounds shows that carbons 2, 3, and 4 undergo isomerization, but no evidence has been obtained of anomerization. These findings possibly explain the formation of an optically inactive mixture of cis- and trans-tetrahydropyran-3,4-diol under slightly more drastic reaction conditions.

A Study of Copper-Chromium Oxide Catalysts and a Method to Determine Catalytic Activities

1963 ◽  
Vol 7 ◽  
pp. 229-239
Author(s):  
M. Stammler ◽  
M. Pyzyna
Keyword(s):  
Catalytic Activity ◽  
Chromium Oxide ◽  
Oxide Catalysts ◽  
Linear Absorption ◽  
X Ray ◽  
Chromium Spinel ◽  
Copper Chromium ◽  
The Difference ◽  
Two Phases ◽  
Chromium Oxide Catalysts

AbstractAn extensive investigation of chemical composition, particle size, and surface area of copper-chromium oxide catalysts has been made. The two phases present in the activated material are copper oxide (CuO) and copper-chromium spinel (CuCr2O4). The crystallite size of the CuO phase (determined by X-ray diffraction line broadening) can be correlated with the catalytic activity measured on a CO-CO2 oxidation reaction. The catalytic activity of the oxide catalyst can be expressed as a function of the X-ray fluorescence intensity of the Cu Kα line even on changing the absolute copper concentration up to 3%. An attempt is made to explain this phenomenon by the heterogeneity effect caused by the difference in the linear absorption factors for the Cu Kα radiation in the system CuO-CuCr2O4.

THE PREPARATION OF COPPER-CHROMIUM OXIDE CATALYSTS FOR HYDROGENATION

1931 ◽  
Vol 53 (5) ◽  
pp. 2012-2012 ◽  
Author(s):  
Ralph. Connor ◽  
Karl. Folkers ◽  
Homer. Adkins
Keyword(s):  
Chromium Oxide ◽  
Oxide Catalysts ◽  
Copper Chromium ◽  
Chromium Oxide Catalysts

Reactions of nitrogen oxides (NO, N2O) with the surface of a copper-chromium oxide catalyst

1985 ◽  
Vol 21 (3) ◽  
pp. 324-329 ◽  
Author(s):  
R. P. Gura ◽  
V. M. Vlasenko ◽  
V. A. Kuznetsov ◽  
V. V. Raksha
Keyword(s):  
Nitrogen Oxides ◽  
Chromium Oxide ◽  
Oxide Catalyst ◽  
Copper Chromium
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