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The effect of a nickel promoter on the reducibility of a commercial Cu/ZnO/Al2O3 catalyst for CO oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
52132 46865 2008 5 PDF Available
Title
The effect of a nickel promoter on the reducibility of a commercial Cu/ZnO/Al2O3 catalyst for CO oxidation
Abstract

CO oxidation was studied for a commercial Cu/ZnO/Al2O3 catalyst with and without a nickel promoter. The addition of a small amount of nickel can effectively enhance the activity of the Cu/ZnO/Al2O3 catalysts. A strong interaction between Ni2+ ions and Al2O3 is the main factor causing an increase in the catalytic activity of Cu/ZnO/Al2O3. Owing to the formation of CuAl2O4, complete reduction of the Cu/ZnO/Al2O3 catalyst is difficult, even if pretreated by reduction at 573 K for 5 h. As Ni2+ ions complex with Al2O3 in the copper catalyst and form NiAl2O4, they weaken the interaction between Cu2+ and Al2O3, leading to enrichment of the catalyst surface in Cu2+ ions. This Ni addition could induce the aggregation of Cu atoms on the surface into larger Cu particles, possibly leading to a lower Cu surface area or easy reduction to Cu0 by H2.

Keywords
CO oxidation; Copper catalyst; Nickel promoter; X-ray photoelectron spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 6, 31 March 2008, Pages 1230–1234
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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