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The role of nickel in the initial transformations of hydrodesulfurization catalysts

Authors
Journal
Journal of Catalysis
0021-9517
Publisher
Elsevier
Publication Date
Volume
91
Issue
1
Identifiers
DOI: 10.1016/0021-9517(85)90288-x

Abstract

Abstract The initial hydrodesulfurization activity behavior of supported nickel molybdate catalysts has been found to be markedly influenced by the presence of the promoter (nickel). The promoter diminished both the rate and the extent of deactivation of the fresh catalyst when exposed to a mixture of hydrogen and thiophene at atmospheric pressure. Presulfidation of the catalysts with pure H 2S did not affect the optimum nickel concentration but increased the optimum molybdenum concentration. These results together with those obtained on surface acidity, carbon deposition, and sulfidation extent seems to support the idea that the positive influence of the promoter on the initial transformation of the catalyst is to maintain the dispersion of molybdenum during the sulfidation of the catalyst and to diminish carbon deposition.

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