Cyclohexane transformations over metal oxide catalysts 1. Effect of the nature of metal and support on the catalytic activity in cyclohexane ring opening

摘要

The activities of monometallic Pt-, Ru-, and Rh- containing catalysts supported on Al_2O_3, Al_2O_3-F, SiO_2, WO_3/ZrO_2, and La_2O_3/ZrO_2, in cyclohexane ring opening to form n-hexane were studied. The most active catalyst is Rh/Al_2O_3. Cyclohexane hydrogenolysis to n-hexane also occurs over the Pt/Al_2O_3 and Pt/La_2O_3/ZrO_2 catalysts. Ring opening over the Ru catalysts proceeds at significantly lower tempratures (210-230 deg C) than over the Pt an Rh catalysts (350-400 deg C), but the ruthenium systems are less selective for n-hexane formation than Rh/Al_2O_3 catalysts. The effects of acid-basic properties of the support and the reaction conditions on the activities of the catalytic systems in cyclohexane ring opening was studied.