SMSI EFFECT IN THE BUTADIENE HYDROGENATION ON PD-CU BIMETALLIC CATALYSTS

Niobia Pd-Cu supported bimetallic catalysts have been studied in the 1,3-butadiene hydrogenation. On catalysts reduced at 573K, the addition of copper to palladium decreased the hydrogen adsorption capacity and the turnover frequency but increased the trans/cis 2-butene ratio. These results are ascribed to a bimetallic formation. After reduction at 773K. the hydrogen chemisorption and turnover frequency are drastically reduced due to SMSI effect. The 1,3-butadiene hydrogenation seems to be a structure sensitive reaction.