ABSOLUTE SURFACE COVERAGE OF TUNGSTEN-ALUMINA CATALYSTS

Authors
PFAFF C ZURITA MJP SCOTT C PATINO P GOLDWASSER MR GOLDWASSER J MULCAHY FM HOUALLA M HERCULES DM
Citation
C. Pfaff et al., ABSOLUTE SURFACE COVERAGE OF TUNGSTEN-ALUMINA CATALYSTS, Catalysis letters, 49(1-2), 1997, pp. 13-16
Citations number
33
Journal title
Catalysis letters → ACNP
ISSN journal
1011372X
Volume
49
Issue
1-2
Year of publication
1997
Pages
13 - 16
Database
ISI
SICI code
1011-372X(1997)49:1-2<13:ASCOTC>2.0.ZU;2-4
Abstract
Absolute surface coverages (theta) of a series of tungsten-alumina cat alysts prepared by the equilibrium adsorption method were determined b y ion scattering spectroscopy (ISS) and low-temperature CO adsorption. The theta(CO) values for the W catalysts were very similar to those o btained with the ISS method, for a given W loading. A linear increase in W coverage with increasing W loading, reaching similar to 55% cover age for the 13.1% W solid, was observed. ?The calculated W cross-secti ons (22.0-24.5 Angstrom(2)/W) were in agreement with other reports in the literature. Due to the inherent limitations of each method, the co mbined use of ISS and low-temperature CO adsorption is recommended for estimating absolute surface coverages in tungsten-alumina catalysts.