Issue 7, 2011

The stability and deactivation of Pd–Cu–Clx/Al2O3catalyst for low temperature CO oxidation: an effect of moisture

Abstract

The catalytic stability of a Pd–Cu–Clx/Al2O3 catalyst for low temperature CO oxidation was investigated in different conditions. Under ∼0.1% moisture, the CO conversion over the Pd–Cu–Clx/Al2O3 catalyst can be maintained at 100% for 30 h even at 0 °C, but it deactivated reversibly at 25 °C with ∼0.6% moisture and irreversibly deactivated at 25 °C with ∼3.1% moisture or 0 °C with ∼0.6% moisture. The reversible deactivation is resulted from physical capillary condensation in the small pores of the catalysts. The irreversible deactivation is due to a breakage of the close-knit structure of Pd–Cu–Cl leading to an aggregation or transformation of the active copper phase, and the formation of a carbonate species on the catalyst surface, meaning that the inactive Pd0 species over the surface of the Pd–Cu–Clx/Al2O3 catalyst is hard to re-oxidize back to the active Pd+ sites by copper species in the high moisture reaction conditions.

Graphical abstract: The stability and deactivation of Pd–Cu–Clx/Al2O3 catalyst for low temperature CO oxidation: an effect of moisture

Article information

Article type
Paper
Submitted
26 Apr 2011
Accepted
23 Jun 2011
First published
16 Aug 2011

Catal. Sci. Technol., 2011,1, 1202-1207

The stability and deactivation of Pd–Cu–Clx/Al2O3 catalyst for low temperature CO oxidation: an effect of moisture

Y. Shen, Y. Guo, L. Wang, Y. Wang, Y. Guo, X. Gong and G. Lu, Catal. Sci. Technol., 2011, 1, 1202 DOI: 10.1039/C1CY00146A

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