NDLI: Effect of anionic admixtures on the copper–magnesium mixed oxide reduction

Content Provider	Springer Nature Link
Author	Khassin, Alexander A. Filonenko, Georgiy A. Minyukova, Tatyana P. Molina, Irina Yu. Plyasova, Lyudmila M. Larina, Tatyana V. Anufrienko, Vladimir F.
Copyright Year	2010
Abstract	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 CO$_{3}$ $^{2−}$ and OH$^{−}$ anions. Its reduction proceeds via two stages: (1) diffusion of Cu$^{2+}$ to the surface and (2) chemical interaction of Cu$^{2+}$ with hydrogen. The effective activation energy gradually increases from that of the chemical step (65 kJ/mol) to that of the transport step of Cu$^{2+}$ 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 Cu$^{2+}$ 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.
Starting Page	73
Ending Page	83
Page Count	11
File Format	PDF
ISSN	18785190
Journal	Reaction Kinetics and Catalysis Letters
Volume Number	101
Issue Number	1
e-ISSN	18785204
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-06-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Copper–magnesium oxide Reduction Kinetics Thermal analysis Anionic admixture Isokinetic effect Compensation effect Diffusion Industrial Chemistry/Chemical Engineering Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Catalysis

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