New High-Selectivity Hydrogenation Catalysts Prepared from Bimetallic Acetate Complexes

作者：Mashkovskii I S^*; Tkachenko O P; Baeva G N; Stakheev A Yu

来源：Kinetics and Catalysis, 2009, 50(5): 768-774.

DOI：10.1134/S0023158409050206

The catalytic properties of new Pd-Zn/Al(2)O(3) catalysts in selective acetylene hydrogenation in an acetylene-ethylene mixture at 30-120 degrees C and atmospheric pressure are reported. The catalysts prepared from the bimetallic complex Pd-Zn(OOCMe)(4)(OH(2)) are much more selective than the catalysts prepared by simultaneously supporting the homonuclear complexes Pd(3)(OOCMe)(6) and Zn(OOCMe)(2) center dot 2H(2)O. It is demonstrated by diffuse reflectance IR spectroscopy of adsorbed CO that the heat treatment of the supported bimetallic complex at 250 degrees C in flowing H(2) yields a Pd-Zn alloy on the surface. It is this alloy that ensures the high selectivity of the Pd-Zn/Al(2)O(3) catalysts.

• 出版日期2009-9