Absolute surface coverage of tungsten-alumina catalysts

Author: Pfaff C.   Peèrez Zurita M.J.   Scott C.   Patinìo P.   Goldwasser M.R.   Goldwasser J.   Mulcahy F.M.   Houalla M.   Hercules D.M.  

Publisher: Springer Publishing Company

ISSN: 1011-372X

Source: Catalysis Letters, Vol.49, Iss.1-2, 1997-11, pp. : 13-16

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Abstract

Absolute surface coverages (θ) of a series of tungsten-alumina catalysts prepared by the equilibrium adsorption method were determined by ion scattering spectroscopy (ISS) and low-temperature CO adsorption. The θCO values for the W catalysts were very similar to those obtained with the ISS method, for a given W loading. A linear increase in W coverage with increasing W loading, reaching ~55% coverage for the 13.1% W solid, was observed. The calculated W cross-sections (22.0- 24.5Å2/W) were in agreement with other reports in the literature. Due to the inherent limitations of each method, the combined use of ISS and low-temperature CO adsorption is recommended for estimating absolute surface coverages in tungsten-alumina catalysts.

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