Catalytic selective reduction of NO over silica supported Pt catalysts

摘要

The catalytic selective reductions of NO withethylene and propylene over Pt catalysts supported on fumedsilica. Si-ZSM-5 and Si-MCM-41 have been investigated. It isfound that Pt/Si-MCM-41 shows the highest NO reductionconversion to N2. The high activity of Pt/Si-MCM-41 isattributed to the high Pt dispersion and the mesopores of Si-MCM-41support. Modification of Pt/Si-MCM-41 with anappropriate amount of Ti (Si/Ti=40) improves the NO N2 O2catalyses NO reduction only at a low temperature. A high spacevelocity results in a shift of the maximum NO reductiontemperature to the high temperature range.