Effect of Anionic Admixtures on the Copper-Magnesium Mixed OxideReduction | Sciact - CRIS-system of Boreskov Institute of Catalysis

Effect of Anionic Admixtures on the Copper-Magnesium Mixed OxideReduction Full article

Journal

Reaction Kinetics, Mechanisms and Catalysis
ISSN: 1878-5190 , E-ISSN: 1878-5204

Output data

Year: 2010, Volume: 101, Number: 1, Pages: 73-83 Pages count : 11 DOI: 10.1007/s11144-010-0211-1

Tags

Anionic admixture, Compensation effect, Copper-magnesium oxide, Diffusion, Isokinetic effect, Kinetics, Reduction, Thermal analysis

Authors

Khassin Alexander A. ^1,2 , Filonenko Georgiy A. ^1,2 , Minyukova Tatyana P. ^1,2 , Molina Irina Yu. ^1,2 , Plyasova Lyudmila M. ^1,2 , Larina Tatyana V. ¹ , Anufrienko Vladimir F. ¹

Affiliations

1	Boreskov Institute of Catalysis
2	Novosibirsk State University

The anionic composition, structural parameters, optical properties and reduction behavior of Cu–MgO solid solution in hydrogen dramatically change after exposure to air. The air-exposed Cu–Mg oxide contains a lot of CO3 2− and OH− anions. Its reduction proceeds via two stages: (1) diffusion of Cu2+ to the surface and (2) chemical interaction of Cu2+ with hydrogen. The effective activation energy gradually increases from that of the chemical step (65 kJ/mol) to that of the transport step of Cu2+ diffusion (130 kJ/mol). This behavior follows the “compensation effect”, which is close to those reported earlier for CuO reduction. On the contrary, reduction of Cu2+ from the Cu–Mg oxide sample, which was not exposed to air after thermal pretreatment in the inert gas, proceeds in one step at 120–160 °C with the effective activation energy of 19 kJ/mol, which is manifold less than the reported effective activation energies for various Cu-oxide systems. Water molecules eliminate from the sample slowly along with further heating up to 450 °C.

Khassin A.A. , Filonenko G.A. , Minyukova T.P. , Molina I.Y. , Plyasova L.M. , Larina T.V. , Anufrienko V.F.
Effect of Anionic Admixtures on the Copper-Magnesium Mixed OxideReduction
Reaction Kinetics, Mechanisms and Catalysis. 2010. V.101. N1. P.73-83. DOI: 10.1007/s11144-010-0211-1 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	May 24, 2010
Accepted:	Jun 10, 2010
Published online:	Jun 25, 2010
Published print:	Oct 1, 2010

Web of science:	WOS:000281111500007
Scopus:	2-s2.0-77955918296
Elibrary:	18090944
Chemical Abstracts:	2010:1050946
Chemical Abstracts (print):	154:600327
OpenAlex:	W2081802912

DB	Citing
Web of science	6
Scopus	8
Elibrary	10
OpenAlex	8