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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