Maximizing the hydrothermal stability of Cu-LTA for NH3-SCR by control of Cu content and location

被引：22
作者：
Lin, Jinhan [1 ,2 ,3 ]
Hu, Xueyang [1 ,2 ,3 ,4 ]
Li, Yingjie [1 ,2 ,3 ,4 ]
Shan, Wenpo [1 ,2 ,3 ]
Tan, Xuechao [5 ]
He, Hong [1 ,2 ,4 ,6 ]
机构：
[1] Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China
[2] Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Pollutant Convers, Xiamen 361021, Peoples R China
[3] Chinese Acad Sci, Inst Urban Environm, Zhejiang Key Lab Urban Environm Proc & Pollut Cont, Ningbo Urban Environm Observat & Res Stn, Ningbo 315800, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[5] POSTECH, Ctr Ordered Nanoporous Mat Synth, Div Environm Sci & Engn, Pohang 37673, South Korea
[6] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Cont, Beijing 100085, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY | 2023年 / 331卷
基金：
中国国家自然科学基金;
关键词：
Cu-LTA; Cu content; Cu species; Hydrothermal stability; NH3-SCR; SELECTIVE CATALYTIC-REDUCTION; HIGH-SILICA LTA; NOX REDUCTION; ACTIVE-SITES; CU-SSZ-13; ZEOLITE; DURABILITY; KINETICS; AMMONIA; IONS;
D O I：
10.1016/j.apcatb.2023.122705
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Hydrothermal stability is crucial for the application of NOx emission control catalysts on diesel vehicles. In this study, the influences of Cu content and Cu species on the catalytic performance and hydrothermal stability of copper-exchanged LTA (Cu-LTA) zeolite catalysts for the selective catalytic reduction of NOx with NH3 (NH3- SCR) have been systematically investigated. The Cu-LTA(n)-0.41 catalyst with the maximum amount and ratio of Cu2+-2Z species in Cu-LTA, with Cu/Al = 0.41 and Si/Al = 16, was produced by full occupation of Al pairs in the single 6-rings (s6rs) with Cu2+ ions. This catalyst showed higher deNOx activity after hydrothermal aging under extremely harsh conditions of 920 degrees C for 24 h than any of the other catalysts. The results suggest that maximizing the amount of Cu2+-2Z species and diminishing the formation of comparatively vulnerable [Cu (OH)]+-Z species in the high-silica LTA zeolite is an effective strategy for developing hydrothermally stable NH3- SCR catalysts.
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页数：10
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