SRI8610C气相色谱应用资料2
2012-12-10 13:24
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资料摘要:
Water-gas-shift (WGS) reaction rates have been measured on Pd/ceria, Ni/ceria, Fe/ceria, Co/ceria, ceria, and Pd/silica.Pd/ceria exhibited much higher activities than either ceria alone or
Pd/silica, demonstrating a cooperative effect between Pd
and ceria. Pd/ceria and Ni/ceria showed essentially the same activities and were much more active than either Co/ceria or
Fe/ceria. Reaction orders on Pd/ceria were approximately zeroth-order in CO, half-order in H2O, inverse-half-order in CO2
and inverse-first-order in H2. Diffuse reflectance, FTIR measurements on Pd/ceria indicate the ceria exists in a reduced state
under WGS conditions and is covered by carbonate species that are removed only by reoxidation of ceria. The implications
of these results for improved WGS catalysis are discussed. © 2001 Elsevier Science B.V. All rights reserved.
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