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Preferential oxidation of CO by CuOx/CeO2 nanocatalysts prepared by SACOP. Mechanisms of deactivation under the reactant stream

Paper ID Volume ID Publish Year Pages File Format Full-Text
42467 45926 2009 10 PDF Available
Title
Preferential oxidation of CO by CuOx/CeO2 nanocatalysts prepared by SACOP. Mechanisms of deactivation under the reactant stream
Abstract

CuOx/CeO2 nanocatalysts were synthesized using the silica aquagel co-precipitation (SACOP) technique and tested for the preferential oxidation of CO (PROX). In spite of their high catalytic activity and selectivity, it was found that deactivation restricted their utilization in practical conditions, as is the case for most copper-based catalysts analyzed in the PROX process. In order to determine the causes of deactivation exhaustive analyses of the evolution of the composition of the catalyst surface during the reaction were performed by means of spectroscopic techniques (XPS and FTIR). Moreover step–response experiments under different atmospheres were carried out in order to establish the deactivating potential of the different gases present in the reactant stream. The deactivation mechanism comprises the formation of surface carbonates (the main cause of deactivation) and the partial sintering of copper (by the aggregation of dispersed Cu2+ in CuO clusters), both of which are a function of the gas concentration, temperature and reaction time.

Graphical abstractCuOx/CeO2 nanocatalysts were synthesized using the silica aquagel co-precipitation (SACOP) technique and tested for the preferential oxidation of CO (PROX). In spite of their high catalytic activity and selectivity they suffer from some deactivation. The deactivation mechanism comprises the formation of surface carbonates (the main cause of deactivation) and the partial sintering of copper (by the aggregation of dispersed Cu2+ in CuO clusters), both of which are a function of the gas concentration, temperature and reaction time.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Preferential oxidation of CO; Deactivation; Sintering; Carbonates; CuOx/CeO2
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Preferential oxidation of CO by CuOx/CeO2 nanocatalysts prepared by SACOP. Mechanisms of deactivation under the reactant stream
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 361, Issues 1–2, 20 June 2009, Pages 160–169
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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Any Questions? feel free to contact us