Pt/SAPO-34在低温H2选择催化还原NO反应中的催化活性

催化学报 , 2008, 29(2): 191-196.

Pt/SAPO-34在低温H2选择催化还原NO反应中的催化活性

武鹏 ^1, , 刘运霞 ^2, , 章福祥 ^3, , 武光军 ^4, , 吕宝成 ^5, , 关乃佳 ^6,

1.南开大学化学学院新催化材料研究所,天津,300071

2.南开大学化学学院新催化材料研究所,天津,300071

3.南开大学化学学院新催化材料研究所,天津,300071

4.南开大学化学学院新催化材料研究所,天津,300071

5.南开大学化学学院新催化材料研究所,天津,300071

6.南开大学化学学院新催化材料研究所,天津,300071

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

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

Catalytic Activity of Pt/SAPO-34 for Selective Catalytic Reduction of NO by H 2 at Low Temperature

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/SAP O-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(80 000 h-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 10 0 00 h-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H 2-SCR反应的机理,发现反应的中间物种主要是- NO-3.

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