Novel Cu-Based CHA/AFI Hybrid Crystal Structure Catalysts Synthesized for NH3-SCR

被引:24
|
作者
Lin, Qingjin [1 ]
Xu, Shuhao [1 ]
Liu, Shuang [2 ]
Liu, Jingying [1 ]
Wang, Yun [3 ]
Chen, Dequan [3 ]
Xu, Haidi [2 ,4 ,5 ,6 ]
Chen, Yaoqiang [1 ,2 ,4 ,5 ,6 ]
机构
[1] Sichuan Univ, Coll Chem, Key Lab Green Chem & Technol, Minist Educ, Chengdu 610064, Sichuan, Peoples R China
[2] Sichuan Univ, Inst New Energy & Low Carbon Technol, Chengdu 610064, Sichuan, Peoples R China
[3] Sinocat Environm Technol Co Ltd, Chengdu 611731, Sichuan, Peoples R China
[4] China Automot Technol & Res Ctr, Natl Engn Lab Mobile Source Emiss Control Technol, Tianjin 300300, Peoples R China
[5] Sichuan Prov Environm Protect Environm Catalyt Ma, Chengdu 610064, Sichuan, Peoples R China
[6] Sichuan Univ, FGD, State Engn Res Ctr, Chengdu 610064, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
HIGH-TEMPERATURE SYNTHESIS; STATE ION-EXCHANGE; CU/SAPO-34; CATALYSTS; MOLECULAR-SIEVES; NOX REDUCTION; ACTIVE-SITES; SAPO-34; AMMONIA; NH3; ZEOLITES;
D O I
10.1021/acs.iecr.9b01273
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Cu/SAPO-34/5 catalysts were prepared by a traditional hydrothermal/impregnation method to investigate the effect of SAPO-34/5 on deNO(x) performance over Cu/SAPO-34/S (the proportion of SAPO-34/SAPO-5 calculated by its main diffraction peak intensity). These characteristic results prove the fact that the superior deNO(x) performance of Cu/SAPO-34/S(3.16) is due to its most abundant Bronsted (B) acid sites and active isolated Cu2+. A higher amount of B acid sites over SAPO-34/5(3.16) is better to disperse and stabilize the isolated Cu2+ species. Besides, kinetic analysis on as-synthesized Cu/SAPOs catalysts confirms that the hybrid crystal structure of SAPO-34/5 does not change the reaction mechanism for selective catalytic reduction with NH3 (NH3-SCR). This work provides a new route to synthesize a novel zeolite NH3-SCR catalyst for eliminating NOx emitted from diesel engines.
引用
收藏
页码:18046 / 18054
页数:9
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