Results 161 to 170 of about 1,079 (210)

Kinetic study of ethanol dehydrogenation to ethyl acetate promoted by a copper/copper-chromite based catalyst

Catalysis Today, 2013
A kinetic study of the ethanol dehydrogenation to ethyl acetate on a copper/copper-chromite catalyst has been performed. The used catalyst, in cylindrical pellets, contained also alumina as a support and barium chromate as a promoter.
G Carotenuto, Riccardo Tesser, Martino Di Serio   +2 more
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Selective hydrogenation on copper chromite catalysts

Applied Catalysis, 1986
Abstract Reactions of various allylic alcohols were studied on a copper chromite catalyst. Three different reactions were observed: hydrogenation, isomerization and deoxygenation. By comparison with some other model compounds such as butanol, butanone and butadiene, analysis of the mechanism of the deoxygenation process suggests that, in fact, this ...
V. Reactions of allylic alcohols, R. Hubaut, M. Daage, J.P. Bonnelle   +3 more
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Adsorption of hydrogen on reduced copper chromite

Reaction Kinetics and Catalysis Letters, 2003
Temperature programmed desorption and volumetric methods in static conditions were used to study hydrogen adsorption on the surface of metallic copper particles produced by the partial reduction of copper chromite CuCr2O4 with hydrogen. In the temperature range 300-573 K and in the range of medium surface coverages by hydrogen, the main state of ...
I. I. Simentsova, L. P. Davydova, A. V. Khasin, T. M. Yurieva   +3 more
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Copper Chromite-Quinoline

2001
[12053-18-8] Cr2Cu2O5 (MW 311.07) InChI = 1S/2Cr.2Cu.5O InChIKey = JGDFBJMWFLXCLJ-UHFFFAOYSA-N [91-22-5] C9H7N (MW 129.16) InChI = 1S/C9H7N/c1-2-6-9-8(4-1)5-3-7-10-9/h1-7H InChIKey = SMWDFEZZVXVKRB-UHFFFAOYSA-N (decarboxylation catalyst) Physical Data: see the entries for Copper Chromite and Quinoline. Form
Edward J. Parish, Stephen Kizito
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Character of hydrogen interaction with copper chromite

Reaction Kinetics & Catalysis Letters, 1996
Hydrogen bonding kinetics have been studied and water amounts produced in H2 interaction with copper chromite CuCr2O4 determined. Two possible interaction mechanisms are suggested: (1) a mechanism involving solid phase oxygen accompanied by water formation; (2) direct redox copper displacement from chromite by hydrogen that requires no oxygen ...
I. I. Simentsova, A. V. Khasin, T. M. Yurieva   +2 more
openaire   +1 more source

Interaction of hydrogen with copper chromite surface

Reaction Kinetics & Catalysis Letters, 1994
Kinetics of the surface reduction of copper chromite, CuCr2O4, with molecular hydrogen has been studied. H2S transformation proceeds with participation of copper reduced states, probably Cu0, formed as a result of surface reaction. Process kinetics has a topochemical character.
A. V. Khasin, I. I. Simentsova, T. M. Yurieva   +2 more
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Lithium intercalation into copper ferrite and copper chromite: Redox extraction of copper

Materials Research Bulletin, 1992
Abstract From Mossbauer measurements we have shown that during lithium intercalation into copper ferrite no reduction of iron occurs, which means that the electronic transfer concerns copper. Copper chromite behaves in a similar way: the intercalation-induced reduction of copper results in its extraction from the structure as Cu 0 , which can then be
Laure Monconduit, Nabil Allali, Annie Leblanc, Michel Danot   +3 more
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Electrical transport in copper chromite catalyst

Journal of Materials Science, 1984
The electrical conductivity, σ, and thermoelectric power, S, of copper chromite (CuCr2O4) are reported in the temperature range 295 to 815 K. A break (TB) in the slope of the plot of log σ against T−1 was observed around 556 K. Apart from this break, the curves are linear, and their slopes correspond to activation energies of 0.60 eV (TB 556 K).
B. N. Tiwari, P. N. Ojha, C. S. Shukla
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Study of copper chromite catalysts, III. Structure and catalytic activity of copper chromite catalyst in reductive alkylation reaction

Reaction Kinetics and Catalysis Letters, 1986
The catalytic activity of copper chromite catalysts prepared by thermal decomposition reaction of basic copper(II) ammonium chromate, CuCrO4[Cu(OH)2]0.17−(NH4OH)0.78, and copper(II) chromate CuCrO4, has been studied. The catalysts with highly disordered structure, prepared from basic copper(II) ammonium chromate at 270–320 °C, show the highest ...
F. Hanic, G. Plesch, P. Dolezel, J. Ovecková   +3 more
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Crystal and magnetic structure of copper chromite

Acta Crystallographica, 1957
Copper chromite, CuCr~O 4, is a tetragonally distorted normal spinel with a c/a ratio, as referred to a face-centered unit cell, of about 0.91. A structure which is physically reasonable, belonging to the space group D~-I42d, is based on an environment for the copper ions which is distorted from a tetr~hedron toward a square, and also slightly rotated ...
openaire   +1 more source