Abstract
Two niobia(Nb 2O 5)-supported nickel catalysts, containing 2 and 10 wt% nickel, were prepared by incipient wetness impregnation. Subsequent to reduction in hydrogen at 573 and 773 K for 1 h, these catalysts adsorbed a smaller amount of hydrogen at room temperature than silica-supported nickel catalysts similarly prepared. The suppression in hydrogen adsorption was more pronounced for the 2 wt% sample, which had a smaller average crystallite size as determined by X-ray line broadening measurement. Thermogravimetric analysis showed a facile reduction of the nickel precursor salt to metallic nickel. The chemisorption behavior was thus ascribed to strong metal-support interactions (SMSI). These results compared with similar data previously obtained for titania(TiO 2)-supported nickel catalysts showed that niobia was a more interacting support than titania for nickel, when parameters such as average crystallite size and reduction treatment were comparable. The extent of interaction appeared to correlate with the reducibility of the oxide support, although quantitative thermogravimetric measurements suggested that the amount of support being reduced was small.
Published Version
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