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Adsorption and reaction of CO and H2 on K-promoted Rh/SiO2 catalysts

Kesraoui, S, Oukaci, R and Blackmond, DG (1987) Adsorption and reaction of CO and H2 on K-promoted Rh/SiO2 catalysts Journal of Catalysis, 105 (2). pp. 432-444.

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The adsorption of CO and H2 on a series of alkali-promoted Rh/SiO2 catalysts was investigated by IR spectroscopy and volumetric chemisorption. The characteristics of the support as well as the method of addition of the alkali species were found to influence the adsorptive properties of the catalysts. Alkali species on wide-pore Rh/SiO2 tended to partition to the support and did not interact strongly with the Rh crystallites. When alkali and metal salts were coimpregnated onto a nonporous SiO2 support, intimate alkali-metal contact resulted in significant electronic interactions between the alkali species and the metal. When alkali species were added to a prereduced Rh/SiO2 (nonporous) catalyst, a chemical interaction between a tilted adsorbed CO and the alkali species was suggested. The nature and location of the alkali species were suggested to be important parameters in determining the effect of alkali promoters on Rh/SiO2 catalysts. The rate of CO conversion decreased substantially with promotion for all of the promoted catalysts. An unusually low apparent activation energy was found for the sequentially impregnated (nonporous SiO2) promoted catalyst, and it was suggested that this might be related to the unusually low frequency peak seen in the IR spectrum of adsorbed CO on this catalyst.

Item Type: Article
Divisions : Surrey research (other units)
Authors : Kesraoui, S, Oukaci, R and Blackmond, DG
Date : June 1987
DOI : 10.1016/0021-9517(87)90071-6
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 11:43
Last Modified : 24 Jan 2020 21:08

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