Catalytic Performence and Surface Properties in Selective Catalytic Reduction of NO over Pt/MCM-48, MCM-41 and Pt/ZSM-5

摘要

Selective catalytic reduction of NO_x in oxygen rich exhaust stream of stationary and mobile is one of the major challenges in environmental catalysis. Ever since the work carried out by Held and Iwamoto showing that selective reduction of nitric oxide was possible by the use of a hydrocarbon as the reducing agent, this reaction has been the object of much attention from industrial and academic viewpoint. However, microporous molecular sieves, which have been widely researched as a support of HC-SCR catalyst, have a few problems such as diffusion resistance by narrow pore structure, decrease of hydrothermal stability and impregnation limitation of active metal component. In this study, we have investigated the activity of platinum-doped MCM-48 with that of mesoporous material in de-NOx HC-SCR, and simultaneously, it is compared with ZSM-5 used as a commercial support.