Benzyltitanium- und -zirconium/Al2O3-Katalysatoren zur partiellen Hydrierung von Acetylen

Benzyl Titanium and Zirconium Alumina Catalysts for Partial Hydrogenation of Acetylene Benzyl titanium and zirconium compounds of the types Bzl₄M, C₅H₅MBzl₃, and (C₅H₅)₂MBzl₂ form surface compounds on dehydroxylated alumina (15% α-, and 85% δ-Al₂O₃) which on hydrogenolysis yield TiH- and ZrH-species. The supported systems were studied with respect to catalytic activity in the partial hydrogenation of acetylene. Supported (C₅H₅)₂TiBzl₂ was proved to be inactive and the systems C₅H₅TiBzl₃(Al₂O₃) and Bzl₄/Al₂O₃ catalyze the formation of polyacetylene, but catalysts containing benzyl zirconium species are suitable for the partial hydrogenation of acetylene. Acitivity and selectivity of the system C₅H₅ZrBzl₃/Al₂O₃ are comparable to industrial used Pd/Al₂O₃ catalysts.