Influence of metal-support interactions on the dispersion, distribution, reducibility and catalytic activity of Ni/SiO2 catalysts

M. Montes, Ch Penneman de Bosscheyde, B. K. Hodnett, F. Delannay, P. Grange, B. Delmon

Research output: Contribution to journalArticlepeer-review

Abstract

The influence of metal-support interactions on the dispersion, distribution, reducibility and catalytic activity for benzene hydrogenation of Ni/Si02 catalysts, prepared by impregnation or deposition-precipitation, was studied. Weak interact-ions were observed for the former; the latter technique gave rise to strong inter-actions. Nickel contents were from 6-9 wt%. The impregnated precursor featured nickel evenly distributed between the internal (pores) and external surface of the support. Direct reduction did not noticeably change the distribution and a Ni/SiO2 catalyst formed in which the active phase was finely divided and evenly distributed. Calcination of this precursor caused migration of the nickel to the external surface with the formation there of large crystallites of NiO. The pre-cursor prepared by deposition-precipitation, consisted of nickel hydro-silicate deposited uniquely on the external surface and in the pore mouths. Calcination or reduction of this material did not noticeably change the distribution, but high dispersion was observed in both cases. The stability of catalysts prepared by this technique is discussed in terms of interaction between nickel and silica.

Original languageEnglish
Pages (from-to)309-330
Number of pages22
JournalApplied Catalysis
Volume12
Issue number4
DOIs
Publication statusPublished - 1984
Externally publishedYes

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