The catalytic activity of nickel-substituted mica montmorillonite

Nickel-substituted mica montmorillonite (NiSMM) is of particular interest as a catalyst for the hydroisomerization and hydrocracking of paraffins. An important pretreatment step of this catalyst is its reduction in hydrogen. Temperature-programmed reduction and X-ray diffraction show that palladium...

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Bibliographic Details
Published in:Journal of catalysis 1983-01, Vol.80 (1), p.145-153
Main Authors: Heinerman, J.J.L., Freriks, I.L.C., Gaaf, J., Pott, G.T., Coolegem, J.G.F.
Format: Article
Language:English
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Summary:Nickel-substituted mica montmorillonite (NiSMM) is of particular interest as a catalyst for the hydroisomerization and hydrocracking of paraffins. An important pretreatment step of this catalyst is its reduction in hydrogen. Temperature-programmed reduction and X-ray diffraction show that palladium promotes the formation of zero-valent nickel. Infrared spectra of ammonia adsorbed onto NiSMM reveal that the reduction step also increases the number of acid sites. Removal of metallic nickel from reduced NiSMM (not containing palladium) by carbon monoxide destroys the pentane hydroisomerization activity, while leaving the number of acid sites unchanged. Apparently, the acid sites alone are not capable of isomerizing pentane, the presence of a metal function being necessary.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(83)90239-7