Abstract
Highly dispersed Au/AI 2 O 3 and Pt/Al 2 O 3 catalysts were applied to the lower layer of double wash-coated monolith catalyst for selective catalytic reduction (SCR) of NOx with C 3 H 6 . H- mordenite, Cu-mordenite or MCM-41 was coated as the upper layer. The catalytic performance was investigated in the presence of oxygen. The double wash-coated catalysts were more active than the catalyst with only zeolite or without upper layer. Temperature window of the double wash-coated catalyst was broadened, and catalytic performance was remarkably improved. The role of each layer and a reaction mechanism were discussed. The combined noble metal monolith catalyst with zeolite was effective in removing NOx by SCR with hydrocarbons.
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