物理化学学报 >> 2015, Vol. 31 >> Issue (11): 21652165-2173.doi: 10.3866/PKU.WHXB201509184

催化和表面科学 上一篇    下一篇

微波辐射法制备Cu-SSZ-13催化剂及其对柴油车尾气NOx的脱除

俞华峰1,张国佩1,韩丽娜1,2,常丽萍1,鲍卫仁1,王建成1,*()   

  1. 1 太原理工大学煤科学与技术教育部和山西省重点实验室,太原030024
    2 太原理工大学材料科学与工程学院,太原030024
  • 收稿日期:2015-08-19 发布日期:2015-11-13
  • 通讯作者: 王建成 E-mail:wangjiancheng@tyut.edu.cn
  • 基金资助:
    国家自然科学基金(20906067);山西省高校“131”领军人才工程和山西省回国留学人员科研项目(2015-039)

Cu-SSZ-13 Catalyst Synthesized under Microwave Irradiation and Its Performance in Catalytic Removal of NOx from Vehicle Exhaust

Hua-Feng. YU1,Guo-Pei. ZHANG1,Li-Na. HAN1,2,Li-Ping. CHANG1,Wei-Ren. BAO1,Jian-Cheng. WANG1,*()   

  1. 1 Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, P. R. China
    2 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
  • Received:2015-08-19 Published:2015-11-13
  • Contact: Jian-Cheng. WANG E-mail:wangjiancheng@tyut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(20906067);“131 Talents Project” of Colleges and Universitiesin Shanxi Province, China, and Research Project Supported by Shanxi Scholarship Council of China(2015-039)

摘要:

采用微波辐射法和传统水热法分别制备了Cu-SSZ-13催化剂,用于柴油车尾气NOx的脱除.用X射线衍射(XRD)、N2物理吸脱附、H2程序升温还原(H2-TPR)、电子顺磁共振(EPR)、NH3程序升温脱附(NH3-TPD)、电感耦合等离子体质谱(ICP-MS)及X射线光电子能谱(XPS)等方法对样品进行表征.结果表明,微波辐射法大大缩短了SSZ-13分子筛的晶化时间,晶化9 h制得样品的结晶度与传统水热法晶化72 h制得样品的结晶度相近,同时孔结构参数也得到了一定程度的改善,微波辐射法制备样品的Brönsted(B)酸性位和Lewis(L)酸性位增多,活性组分铜的负载量也得到显著的提高,使得微波辐射法制备的催化剂呈现出优异的低温活性和水热稳定性.

关键词: 微波辐射法, 传统水热法, Cu-SSZ-13, 脱硝, 水热老化

Abstract:

Cu-SSZ-13 catalysts had been prepared by using a microwave irradiation (MW) method and a conventional hydrothermal (CH) method, which were applied to removal of NOx from diesel vehicles by NH3. The physical and chemical properties of the samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, H2 temperature-programmed reduction (H2-TPR), electron paramagnetic resonance (EPR), NH3 temperature-programmed desorption (NH3-TPD), inductively coupled plasma-mass spectroscopy (ICP-MS), and X-ray photoelectron spectroscopy (XPS). The MW had some significant advantages, greatly shortening the crystallization time of SSZ-13 and improving its physical and chemical properties. The sample synthesized using MW with a crystallization time of 9 h had similar crystallinity to that synthesized by the CH with a crystallization time of 72 h. The sample synthesized by the MW had improved pore structure and amounts of Lewis (L) acid and Brönsted (B) acid. The great increase in Cu load as an active component indicated that the MW enhanced the ability of SSZ-13 to perform Cu exchange. The Cu-SSZ-13 synthesized by MW had improved low-temperature activity and anti-aging ability.

Key words: Microwave irradiation method, Conventional hydrothermal method, Cu-SSZ-13, DeNOx, Hydrothermal aging

MSC2000: 

  • O643