Pt/SAPO-34在低温H_2选择催化还原NO反应中的催化活性  

Catalytic Activity of Pt/SAPO-34 for Selective Catalytic Reduction of NO by H_2 at Low Temperature

作　　者：武鹏[1] 刘运霞[1] 章福祥[1] 武光军[1] 吕宝成[1] 关乃佳[1] 

机构地区：[1]南开大学化学学院新催化材料研究所,天津300071

出　　处：《催化学报》2008年第2期191-196,共6页

基　　金：国家重点基础研究发展计划(973计划;2003CB615801);国家自然科学基金(20573059)

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-NO3-.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 of 80 000 h^-1 and 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 10 000 h^- 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.

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 

分 类 号：X701[环境科学与工程—环境工程]