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Determination of the surface coverage of Mo/Al 2 O 3 catalysts
Author(s) -
Sazo Virginia,
Gonzales Lilian,
Goldwasser José,
Houalla Marwan,
Hercules David M.
Publication year - 1995
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740230605
Subject(s) - chemisorption , adsorption , catalysis , chemistry , analytical chemistry (journal) , bicarbonate , materials science , inorganic chemistry , chromatography , organic chemistry , biochemistry
Abstract The surface coverage of a series of Mo/Al 2 O 3 catalysts prepared by the equilibrium adsorption method was measured by CO 2 chemisorption, low‐temperature CO adsorption and ion scattering spectroscopy (ISS). Comparable values were obtained from ISS and CO adsorption. The results correspond to Mo cross‐sections of 22.2 Å 2 Mo −1 (CO) and 20 Å 2 Mo −1 (ISS). The Mo coverages obtained by CO adsorption and ISS were compared with those estimated from CO 2 chemisorption. The resuls indicated that, irrespective of the approach used to measure the coverage from CO 2 chemisorption (volumetric method or from the decrease of the IR peaks attributed to bicarbonate and ‘free’ carbonate species), the CO 2 ‐based method signficantly overestimates the coverage.