高等学校化学学报

高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (8): 1919.doi: 10.7503/cjcu20130203

• 物理化学 • 上一篇    下一篇

Pt/ZSM-35/MCM-49催化剂上H2选择还原NO

于青1, 王忠卫1, 李兰冬2, 武光军2, 关乃佳2   

  1. 1. 山东科技大学材料科学与工程学院, 青岛 266590;
    2. 南开大学化学学院新催化材料研究所, 天津 300071
  • 收稿日期:2013-03-07 出版日期:2013-08-10 发布日期:2013-07-19
  • 通讯作者: 于青,女,博士,讲师,主要从事多相催化的研究.E-mail:laura9751@163.com E-mail:laura9751@163.com
  • 基金资助:

    国家自然科学基金(批准号: 21103099)资助.

NO Selective Reduction by H2 over Pt Supported ZSM-35/MCM-49

YU Qing1, WANG Zhong-Wei1, LI Lan-Dong2, WU Guang-Jun2, GUAN Nai-Jia2   

  1. 1. College of Material Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China;
    2. Institute of New Catalytic Materials Science, College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2013-03-07 Online:2013-08-10 Published:2013-07-19

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摘要：

将共结晶分子筛作为催化剂载体应用于富氧条件下的氮氧化物消除反应. 在体积分数为0.1%NO, 0.5%H2, 6.7%O2, He气为平衡气, 反应空速8×104 h-1条件下对比考察了Pt/ZSM-35/MCM-49, Pt/ZSM-35和Pt/MCM-49催化剂在氢气选择催化还原氮氧化物反应中的活性. 结果表明, Pt/ZSM-35/MCM-49催化剂上的活性较其它2个催化剂有一定程度的提高, NO转化率最高达到84%, N2选择性最高达到74%. 通过X射线衍射(XRD)、 氨气程序升温脱附(NH3-TPD)、 氢气程序升温还原(H2-TPR)、 CO吸附红外和原位漫反射红外对3种催化剂进行了表征. 结果发现, Pt/ZSM-35/MCM-49催化剂活性的提高源于共结晶有利于生成和稳定重要的中间物种——氨物种.

关键词: ZSM-35/MCM-49催化剂, 氢气, NO还原, 铂

Abstract:

Composite zeolite was used as support in NOx elimination. The catalytic performances of Pt/ZSM-35/MCM-49, Pt/ZSM-35 and Pt/MCM-49 were studied on the condition of 0.1%NO, 0.5%H2, 6.7%O2, He as balance gas and GHSV=8×104 h-1. The results show that the activity of Pt/ZSM-35/MCM-49 is higher than the other two catalysts: the maximum NO conversion and N2 selectivity reaches 84% and 74%, respectively. XRD, H2-TPR, CO adsorption and in situ FTIR were employed to characterize these three catalysts. The results indicate that the enhancement of activity comes from the co-crystallization, which is benefit for the formation and stabilization of key intermediates, ammonium species.

Key words: ZSM-35/MCM-49 catalyst, H2, NO reduction, Pt

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