Title: Temperature-programmed sulfidation and oxidation of Ni-Mo/alumina catalysts and reaction with ammonia
Abstract: Temperature-programmed sulfiding (TPS) of an oxidic Ni-Mo-P/Al2O3 catalyst and subsequent temperature-programmed oxidation (TPO) of the sulfided catalyst were performed. Treatments of the sulfided catalysts with ammonia-hydrogen, followed by TPO were also carried out, as well as reaction with n-butylamine-hydrogen at elevated pressure. The TPS results were in agreement with previous studies, showing three general stages of sulfiding: (1) initial exchange of catalyst surface oxygen for sulfur; (2) reduction of molybdenum accompanied by release of hydrogen sulfide; and (3) slow continued sulfiding of the residual oxygen. The TPO runs revealed the presence of hydrogen on the sulfided catalyst. Reaction of ammonia or butylamine with the sulfided catalysts provided evidence for strongly adsorbed nitrogen species, probably as NH or NH2, on the catalyst.
Publication Year: 1991
Publication Date: 1991-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 47
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