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Hysteresis during CO-oxidation activity measurements on carbon-supported copper/chromium catalysts

✍ Scribed by S. Stegenga; N. J. J. Dekker; R. van Soest; F. Kapteijn; J. A. Moulijn

Book ID
104589148
Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
473 KB
Volume
109
Category
Article
ISSN
0165-0513

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✦ Synopsis

Abstract

Carbon‐supported catalysts containing Cu and Cr are active in oxidation and reduction reactions. In CO oxidation experiments, an activity hysteresis has been observed for the Cu/Cr‐carbon catalyst during temperature cycling. From results of CO oxidation experiments and Temperature‐Programmed Reduction (TPR) in CO of fresh, pre‐reduced and pre‐oxidized samples, it is concluded that an oxidation–reduction cycle of the active phase is the reason for this hysteresis phenomenon. Furthermore, TPR(CO) reveals the presence of highly active oxygen species on a Cu/Cr catalyst, which might be the reactive intermediate in CO oxidation. It is also shown that the active phase catalytically oxidizes the carbon support, resulting in a high TPR(CO) background.

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