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CoH-FBZ催化剂表征及选择催化CH4还原NO

Characterization of CoH-FBZ and selective catalytic reduction of NO by CH4

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【作者】 张金桥刘于英樊卫斌李瑞丰

【Author】 ZHANG Jinqiao, LIU Yuying, FAN Weibin, LI Ruifeng (Key Laboratory of Coal Science and Technology, Ministry of Education, Institute of Fine Chemicals, Taiyuan University of Technology,Taiyuan 030024, Shanxi, China)

【机构】 教育部煤科学与技术重点实验室太原理工大学精细化工研究所教育部煤科学与技术重点实验室太原理工大学精细化工研究所 山西太原030024山西太原030024

【摘要】 一种具有FAU和BEA双微孔拓扑结构的分子筛催化剂CoH-FBZ用于富氧条件下CH4催化还原NO(CH4-SCR),应用XRD、FT-IR、DRS-UV-Vis、SEM、AAS、H2-TPR和NH3-TPD等技术对催化剂进行表征.结果表明,CoH-FBZ为均匀单一物相,XRD和FT-IR谱图中,FAU和BEA拓扑结构特征峰明显,NH3-TPD结果表明,双拓扑结构H-FBZ和CoH-FBZ中产生了新的强酸位.CoH-FBZ较CoH-Beta与CoH-Y机械混合样品的催化活性高;CoH-FBZ中FAU与BEA拓扑结构的相对含量FAU/BEA为(0·4∶0·6)0·1∶0·9时,催化剂具有高的CH4-SCR催化活性.强酸位与Co协同作用有利于提高催化剂的CH4-SCR催化活性.

【Abstract】 Selective catalytic reduction of NO by CH4(CH4-SCR) in the presences of excess oxygen was studied over CoH-FBZ catalysts with FAU and BEA double micro-porous topology structure.The catalysts were characterized with XRD, FT-IR, SEM, DRS-UV-Vis, NH3-TPD and H2-TPR techniques.The results showed that uniform morphology was observed over the SEM images of CoH-FBZ.Characteristic peaks attributed to FAU and BEA topology structure were observed over the XRD patterns and the FT-IR spectra of the CoH-FBZ catalysts.New strong acidic sites were formed over H-FBZ and CoH-FBZ based on the NH3-TPD results.CoH-FBZ exhibited higher CH4-SCR activity than the physical mixture of CoH-Y and CoH-Beta with comparable relative content of BEA topology structure.Over the physical mixture catalysts of CoH-Y and CoH-Beta, the CH4-SCR activity decreased with increasing relative content of CoH-Y.In contrast, CoH-FBZ in which the relative content of the FAU to BEA topology structure was (0.4∶0.6)—(0.1∶0.9) exhibited better CH4-SCR catalytic properties.The synergistic effect of the new strong acidic sites promoted the reduction of NO by CH4.

【基金】 国家自然科学基金项目(20206020).~~
  • 【文献出处】 化工学报 ,Journal of Chemical Industry and Engineering(China) , 编辑部邮箱 ,2006年09期
  • 【分类号】O643.32
  • 【被引频次】6
  • 【下载频次】172
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