Hydrothermal stability of CuSSZ13 for reducing NOx by NH3

被引：321

作者：

Kim, Young Jin ^{[1
]}

Lee, Jun Kyu ^{[1
]}

Min, Kyung Myung ^{[1
]}

Hong, Suk Bong ^{[1
]}

Nam, In-Sik ^{[1
]}

Cho, Byong K. ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol POSTECH, Dept Chem Engn, Sch Environm Sci & Engn, Pohang 790784, South Korea

来源：

JOURNAL OF CATALYSIS | 2014年 / 311卷

基金：

新加坡国家研究基金会;

关键词：

NOx reduction; NH3/SCR; CuSSZ13; Hydrothermal stability; ESR; SELECTIVE CATALYTIC-REDUCTION; CU+ PHOTOLUMINESCENCE; LOW-TEMPERATURE; SSZ-13; ZEOLITE; DIESEL-ENGINE; ACTIVE-SITES; IONS; CU-SSZ-13; CU-ZSM-5; SCR;

D O I：

10.1016/j.jcat.2013.12.012

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：

The hydrothermal stability of CuSSZ13 catalysts with respect to their Cu/Al ratio has been investigated to understand the deactivation mechanism of their catalytic activity for NO reduction by NH3/SCR. The decline of the deNOx activity due to the hydrothermal aging became more severe as the Cu/Al ratio increased. Results of ESR, H-2-TPR and DRIFT studies indicated that the D6R sites are occupied first by Cu2+ ions (alpha species) up to their accommodation capacity, followed by the occupation of the CHA sites (beta species) with the increase in the Cu/Al ratio. The beta species agglomerate more readily than alpha species due to their less stable nature, leading to the formation of CuOx. The CuOx may grow to destroy the zeolite cage and channel, resulting in the collapse of the SSZ13 structure, which is believed to be the primary cause for the hydrothermal deactivation of the CuSSZ13 catalyst. (C) 2014 Elsevier Inc. All rights reserved.

引用

页码：447 / 457

页数：11

共 44 条

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