Abstract
Quantitative CO chemisorption measurements were made on nickel catalysts supported on SiO 2, Nb 2O 5 and Nb 2O 5SiO 2 to investigate the nature and stoichiometry of CO adsorption. A close look at conventional methods of performing CO adsorption isotherms revealed that for supported nickel catalysts, the results are quite sensitive to a number of experimental parameters including CO pressure, adsorption temperature and time of equilibration. The formation of Ni(CO) 4 was observed even at subambient adsorption temperature. Erroneous adsorption uptakes and unrealistic CO Ni 5 stoichiometries are likely to result if this tendency for carbonyl formation is not recognized and properly taken into account. The extent of carbonyl formation and the effect of the experimental variables just mentioned are support-sensitive. Consequently CO chemisorption data may be used to evaluate the degree of interaction between nickel and the support.
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