n（硅）/n（铝）对Cu-SAPO-34催化剂C3H6-SCR性能的影响

摘要

Cu-SAPO-34分子筛是一种高性能氮氧化物选择催化还原（SCR）催化剂，其载体SAPO-34对催化剂的氮氧化物催化消除活性有重大影响。采用水热合成法制备了n（硅）/n（铝）为0.4、0.6和0.8的SAPO-34分子筛，X射线粉末衍射（XRD）和扫描电子显微镜（SEM）结果表明随着n（硅）/n（铝）的增大SAPO-34分子筛的结晶度增高，粒度减小；氨气程序升温脱附（NH₃-TPD）结果显示n（硅）/n（铝）为0.8时分子筛的酸量最大。综上所述，n（硅）/n（铝）为0.8时Cu-SAPO-34催化剂表现出最佳的丙烯选择性催化还原（C₃H₆-SCR）性能。

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	李新刚
	闫惠臻
	吕姣龙
	柏凌
	靳凤民

关键词： SAPO-34；分子筛； n（硅）/n（铝）；丙烯选择性催化还原

Abstract：

Cu-SAPO-34 is a promising NO_x selective catalytic reduction (SCR) catalyst. Its support, the SAPO-34 zeolite, has great effect on the catalytic performance of De-NOx. In this work, the SAPO-34 zeolites with the SiO₂/Al₂O₃ ratio of 0.4, 0.6 and 0.8 were synthesized by a hydrothermal process. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results show that the crystallinity of the SAPO-34 zeolites was improved with the increasing of the SiO₂/Al₂O₃ ratio; and NH₃ temperature-programmed desorption (NH₃-TPD) results indicate that the number of the acid sites is largest when the SiO₂/Al₂O₃ ratio is 0.8. As a result, the Cu-SAPO-34 catalyst synthesized with the SiO₂/Al₂O₃ ratio of 0.8 presented the highest C₃H₆ selective catalytic reduction (C₃H₆-SCR) performance.

Keywords： SAPO-34； zeolite； SiO₂/Al₂O₃ ratio； C₃H₆-SCR

Received 2015-05-12;

Fund:

国家自然科学基金（U1232118）。

Corresponding Authors: 靳凤民,E-mail:fmjin@tju.edu.cn。 Email: fmjin@tju.edu.cn

About author: 李新刚(1975-),男,教授,主要从事环境催化方面的研究工作。

引用本文:

李新刚, 闫惠臻, 吕姣龙, 柏凌, 靳凤民.n（硅）/n（铝）对Cu-SAPO-34催化剂C₃H₆-SCR性能的影响[J]. 化学工业与工程, 2017,34(3): 8-12

Li Xingang, Yan Huizhen, Lv Jiaolong, Bo Ling, Jin Fengmin.Effect of the SiO₂/Al₂O₃ Ratio on the C₃H₆-SCR Performance of the Cu-SAPO-34 Catalysts[J]. Chemcial Industry and Engineering, 2017,34(3): 8-12

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