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CO adsorption and correlation between CO surface coverage and activity/selectivity of preferential CO oxidation over supported Ag catalyst: an in situ FTIR study

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In situ IR measurements for CO adsorption and preferential CO oxidation in H2-rich gases over Ag/SiO2 catalysts are presented in this paper. CO adsorbed on the Ag/SiO2 pretreated with oxygen shows a band centered around 2169 cm−1, which is assigned to CO linearly bonded to Ag+ sites. The amount of adsorbed CO on the silver particles (manifested by an IR band at 2169 cm−1) depends strongly on the CO partial pressure and the temperature. The steady-state coverage on the Ag surface is shown to be significantly below saturation, and the oxidation of CO with surface oxygen species is probably via a non-competitive Langmuir–Hinshelwood mechanism on the silver catalyst which occurs in the high-rate branch on a surface covered with CO below saturation. A low reactant concentration on the Ag surface indicates that the reaction order with respect to Pco is positive, and the selectivity towards CO2 decreases with the decrease of Pco. On the other hand, the decrease of the selectivity with the reaction temperature also reflects the higher apparent activation energy for H2 oxidation than that for CO oxidation.

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Authors and Affiliations

  1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457, Zhongshan Road, P.O. Box 110, Dalian, 116023, China

    Zhenping Qu, Shutian Zhou, Weicheng Wu, Can Li & Xinhe Bao

  2. Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring, 55, 70569, Stuttgart, Germany

    Zhenping Qu

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  1. Zhenping Qu
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  2. Shutian Zhou
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  3. Weicheng Wu
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  4. Can Li
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  5. Xinhe Bao
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Correspondence to Xinhe Bao.

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Qu, Z., Zhou, S., Wu, W. et al. CO adsorption and correlation between CO surface coverage and activity/selectivity of preferential CO oxidation over supported Ag catalyst: an in situ FTIR study. Catal Lett 101, 21–26 (2005). https://doi.org/10.1007/s10562-004-3742-0

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  • DOI: https://doi.org/10.1007/s10562-004-3742-0

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