Abstract

Supported Ru/X catalysts (X: SiO2, Al2O3, SiO2·Al2O3, HY) have been investigated by IR and TPR (temperature programmed reduction). Due to interaction between Ru and Lewis or Bronsted sites of the support, the Ru sites become electron-deficient. Stronger acidity of the support makes the Ru sites more electron-deficient, and as a result, adspecies of Ru+δ (CO)4 or Ru+δ(CO)2 can occur more easily.

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