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The role of alkali-metal promotion on CO oxidation over PdO/SnO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44184 46007 2006 11 PDF Available
Title
The role of alkali-metal promotion on CO oxidation over PdO/SnO2 catalysts
Abstract

Sol–gel prepared PdO/SnO2 and Na-PdO/SnO2 catalysts were investigated by X-ray photoelectron spectroscopy (XPS), diffuse reflectance IR (DRIFTS), temperature-programmed reaction spectroscopy (TPRS) and impulse techniques. Alkali-metal promotion was observed to enhance CO oxidation rate and decreases light-off temperatures of PdO/SnO2. XPS analysis revealed that alkali-metal promotion resulted in the segregation of Pd atoms and promoted the oxygen storage capacity of the catalysts. The presence of super-oxide species was also observed over Na-PdO/SnO2 catalyst and the formation of a relatively stable ternary oxide of sodium and palladium (NaxPd3O4) was postulated. Surface titration experiments utilizing pulse technique showed that alkali-metal-promoted sample was able to preserve part of its CO oxidation activity even after reduction pre-treatment and that oxygen diffusion from bulk of the catalyst effectively promoted the activity of Na-PdO/SnO2 sample at 150 °C.

Keywords
Alkali-metal promotion; XPS; Carbon monoxide oxidation; Palladium oxide; Tin oxide
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The role of alkali-metal promotion on CO oxidation over PdO/SnO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 299, 17 January 2006, Pages 84–94
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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