Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2008, Vol. 29 ›› Issue (2): 191-196.

• Articles • Previous Articles     Next Articles

Catalytic Activity of Pt/SAPO-34 for Selective Catalytic Reduction of NO by H2 at Low Temperature

WU Peng, LIU Yunxia, ZHANG Fuxiang, WU Guangjun, L?Baocheng, GUAN Naijia*   

  1. Institute of New Catalytic Materials Science, College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2008-02-25 Online:2008-02-25 Published:2012-01-15

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Abstract: Selective catalytic reduction of NO by H2 (H2-SCR) under lean burn conditions at low temperature(60-260 ℃) was studied over the SAPO-34-supported platinum catalyst. The effects of supports, Pt loading, and reaction conditions on the catalyst activity were investigated. The NO conversion of 78.8% and N2 selectivity of 75.2% were achieved on the 0.5%Pt/SAPO-34 catalyst at GHSV of80000h-1and 120 ℃, superior to that on the Pt/SiO2 and Pt/ZSM-5 catalysts. The decrease in GHSV further enhanced the NO conversion to as high as 100% at GHSV of 10000h-1. The reaction mechanism of NO in H2-SCR over 0.5%Pt/SAPO-34 was investigated using in situ DRIFTS. The results showed that nitrate species were the main reaction intermediates of NO reduction.

Key words: platinum, SAPO-34 zeolite, supported catalyst, hydrogen, selective catalytic reduction, nitrogen monoxide, lean burn, low temperature