Autor: P. Patinìo, Marwan Houalla, M.J. Peèrez Zurita, Mireya R. Goldwasser, Carlos E. Scott, Jose Goldwasser, David M. Hercules, F. M. Mulcahy, C. Pfaff
Rok vydání: 1997
Předmět:
Zdroj: Catalysis Letters. 49:13-16
ISSN: 1011-372X
DOI: 10.1023/a:1019068213486
Popis: 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- 24.5A2/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.
Databáze: OpenAIRE
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