Effect of Support Acidity on Selective Catalytic Reduction of 
NO by C3H6 over Cu-based Pillared Clay Catalyst

Abstract

Abstract:

New pillared clay catalysts were studied for NOx 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 NH4NO3 and(NH4)2SO4 respectively. Cu-based pillared clay catalysts(Cu/Al-Ce-PILC) were prepared by impregnation and applied to C-H₆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 Br-nsted 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 NH₄NO₃ treatment, the Lewis acid sites increase, while NO conversion decreases. As for Al-Ce-PILC treated by(NH₄)₂SO₄, more Br-nsted 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 Br-nsted acid sites are necessary for the SCR reaction of NO because they promote the absorption of C₃H₆to form proper intermediates that are active for the reduction of NO to N₂. The increase of Br-nsted acid sites plays a vital role in the improvement of catalytic performance.

Key words: Cu-based pillared clay catalyst; Acidity; (NH₄)₂SO₄treatment; Nitric oxides; Selective catalytic reduction(SCR)

CLC Number:

O643

TrendMD:

LIN Qi-Chun, LIN Wei-Ming, HAO Ji-Ming, LI Jun-Hua, FU Li-Xin. Effect of Support Acidity on Selective Catalytic Reduction of
NO by C₃H₆ over Cu-based Pillared Clay Catalyst[J]. Chem. J. Chinese Universities, 2006, 27(1): 85.

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Effect of Support Acidity on Selective Catalytic Reduction of
NO by C₃H₆ over Cu-based Pillared Clay Catalyst

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