催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (2): 191-196.

• 研究论文 • 上一篇    下一篇

Pt/SAPO-34在低温H2选择催化还原NO反应中的催化活性

武鹏,刘运霞,章福祥,武光军,吕宝成,关乃佳   

  1. 南开大学化学学院新催化材料研究所, 天津 300071
  • 收稿日期:2008-02-25 出版日期:2008-02-25 发布日期:2012-01-15

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

PDF

931

被引次数

46

摘要： 考察了贫燃条件下Pt/SAPO-34催化剂低温(60～260 ℃)选择催化还原(H2-SCR)消除NO的催化性能,研究了载体、金属负载量和反应条件对催化性能的影响. 结果表明, 0.5%Pt/SAPO-34催化剂的活性高于相同金属负载量的Pt/SiO2和Pt/ZSM-5, 其在高空速(80000h-1)时的最高NO转化率可达78.8%, N2选择性为75.2%, 而在空速降低到10000h-1时,其NO转化率可达到100%. 通过原外漫反射红外光谱初步研究了H2-SCR反应的机理,发现反应的中间物种主要是-NO-3.

关键词: 铂, SAPO-34分子筛, 负载型催化剂, 氢气, 选择催化还原, 一氧化氮, 贫燃, 低温

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