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Probing palladium-silica interactions in Pd/SiO2 catalysts subjected to high temperature reduction

Łomot D.

Polish Journal of Chemistry

1998

Vol. 72, nr 12

2598-2605

Metal-support interactions in silica-supported palladium catalyst have been re-investigated. In addition to the already recognized model reaction of 2,2-dimethylpropane with hydrogen, where the isomerization selectivity appears as a useful indication in diagnosing changes in the catalyst, another effective probe has been used: a variable capability of differently modified palladium to form the hydride phase. High temperature reduction at 600 degree C of 1.6 wt% Pd/SiO2 results in the formation of palladium silicide. However, the prove of this fact by X-ray diffraction is ambiguous or impossible, because of a low content of highly dispersed Pd-containing phase. On the other hand, the formation (stability) of Pd hydride provides an interesting diagnostic tool: Pd/SiO2 transformed into Pd silicide does not form the metal hydride phase. The stability of the Pd hydride phase and the catalytic conversion of 2,2-dimethylpropane are complementary methods is probing silica-supported palladium catalysts.