Alkylhydrosilanes (triethylsilane, dipropylsilane and amylsilane) were observed to exert strong poisoning effects on the hydrogenation and isomerization of 1-pentene on Cab-O-Sil®-supported Cu, Rh and Pt. The Si-C bond-breaking ability of the metals (pulse experiments in H2) also exhibited serious self-poisoning with increasing pulse number. The poisoning activity of these silanes increased with increasing number of Si-H bonds in the molecules (Et3SiH < Pr2SiH2 < AmSiH3) and with increasing temperature. The sensitivity of the metals to poisoning increased in the sequence Rh < Cu < Pt. A correlation was established between the poisoning ability of the molecules and the quantity of chemisorbed/transformed silanes resulting in strongly-bound surface residues.
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