Structure dependence in the hydrogenation of diolefins over Ru thin films

Abstract

Ru thin films were prepared by a radiofrequency (r.f.) sputtering method. The structure of the Ru film changed with film growth. This influenced the activity and the selectivity in the hydrogenation of diolefins. The alterations in the activity and the selectivity were explained in terms of the columnar structure of the Ru film and the Ru (002) intensity in X-ray diffraction patterns. The partial hydrogenation of diolefins proceeded preferably over the (002) face of Ru. Elevating the substrate temperature, the more remarkably (002) orientated Ru film was prepared and showed the higher selectivity for the partial hydrogenation than that on the Ru film prepared at room temperature.