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- W2387823563 abstract "New pillared clay catalysts were studied for NO_(x) removal by hydrocarbon in the presence of oxygen.The purpose of this work is to study the role of support acidity in the selective catalytic reduction(SCR) of NO by propylene.In this paper,montmorillonite was pillared by multi-oligomeric hydroxyl cation to synthesize Al-Ce-PILC and then treated by NH_(4)NO_(3) and(NH_(4))_(2)SO_(4) respectively.Cu-based pillared clay catalysts(Cu/Al-Ce-PILC) were prepared by impregnation and applied to C_(3)H_(6)-SCR of NO.The influence of treatment methods on the structure and acidity of Al-Ce-PILC and the performance of Cu/Al-Ce-PILC were characterized by Py-IR,IR and DSC.The results show that,both Lewis and Brnsted acid sites exist on Al-Ce-PILC,with Lewis acid sites as the main ones,and the maximum NO conversion of Cu/Al-Ce-PILC reaches only 18.5%.As a result of the NH_(4)NO_(3) treatment,the Lewis acid sites increase,while NO conversion decreases.As for Al-Ce-PILC treated by(NH_(4))_(2)SO_(4),more Brnsted acid sites are identified and a superacid structure is formed,and the NO conversion over Cu/Al-Ce-PILC catalyst increases remarkably to 50.2% at 350 ℃,which is associated with the change of the support acidity.It is concluded that Brnsted acid sites are necessary for the SCR reaction of NO because they promote the absorption of C_(3)H_(6) to form proper intermediates that are active for the reduction of NO to N_2.The increase of Brnsted acid sites plays a vital role in the improvement of catalytic performance." @default.
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- W2387823563 date "2006-01-01" @default.
- W2387823563 modified "2023-09-22" @default.
- W2387823563 title "Effect of Support Acidity on Selective Catalytic Reduction of NO by C_3H_6 over Cu-based Pillared Clay Catalyst" @default.
- W2387823563 hasPublicationYear "2006" @default.
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