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Low temperature oxidation of carbon monoxide over alkali-metal promoted palladium-tin oxide catalysts
Date
2005-09-17
Author
MİRKELAMOĞLU, Burcu
Karakaş, Gürkan
Metadata
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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The CO oxidation activity of sol-gel prepared tin dioxide based palladium and sodium-palladium promoted catalysts were investigated by XRD, XPS, DRIFTS and temperature programmed desorption techniques. XPS data suggests that alkali-metal promotion results in the formation of super-oxide species and promotes the surface segregation of Pd atoms, increasing the number of active sites for CO adsorption/oxidation. The formation of a ternary oxide of sodium and palladium is Postulated. Through sub-ambient TPD experiments, the noble metal promoted catalysts have been identified to exhibit CO oxidation activity below ambient temperature. Steady-state CO conversion and rate of reaction data revealed that improvements in the CO oxidation activity of palladized tin dioxide could be achieved under both oxygen-rich and oxygen-lean conditions by sodium-promotion of the catalyst.
Subject Keywords
Alkali-metal promotion
,
Tin dioxide catalysts
,
CO oxidation
,
Temperature-programmed characterization
URI
https://hdl.handle.net/11511/42721
DOI
https://doi.org/10.1007/1-4020-4741-x_32
Collections
Department of Chemical Engineering, Conference / Seminar