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Surface structure and NiO dispersion for NiO/γ‐Al 2 O 3 catalysts
Author(s) -
Gambaro L. A.,
Fierro J. L. G.,
Tejuca L. González,
Agudo A. López
Publication year - 1982
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.740040604
Subject(s) - non blocking i/o , crystallite , dispersion (optics) , chemisorption , materials science , analytical chemistry (journal) , monolayer , catalysis , adsorption , temperature programmed reduction , spectroscopy , chemistry , metallurgy , nanotechnology , optics , physics , organic chemistry , quantum mechanics
Chemisorption of CO at temperatures below 100°C has been used to evaluate the dispersion of NiO in a series of NiO/γ‐Al 2 O 3 catalysts. CO adsorption measurements were supplemented by i.r. spectroscopy to establish the CO/NiO stoichiometry. From monolayer coverage data derived from Freundlich's equation, the percentage of NiO dispersion and the average NiO crystallite size were calculated. The crystallite size of supported NiO was found to be practically constant for NiO loadings from 1 to 8 wt%, experimenting an abrupt increase for higher NiO contents. These results were consistent with additional information on the surface structure of the catalysts obtained by IR spectroscopy, X‐ray diffraction, magnetic susceptibility, and reduction with H 2 .