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题名: Investigation of low-temperature hydrothermal stability of Cu-SAPO-34 for selective catalytic reduction of NOx with NH3
作者: Xiang, Xiao1, 2;  Wu, Pengfei1, 2;  Cao, Yi1;  Cao, Lei1;  Wang, Quanyi1;  Xu, Shutao1;  Tian, Peng1;  Liu, Zhongmin1
关键词: Cu-SAPO-34 ;  Low temperature hydrothermal stability ;  Nitrogen oxides ;  Selective catalytic reduction ;  Ammonia oxidation
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2017-05-01
DOI: 10.1016/S1872-2067(17)62836-5
卷: 38, 页:918-927
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The low-temperature hydrothermal stabilities of Cu-SAPO-34 samples with various Si contents and Cu loadings were systematically investigated. The NH3 oxidation activities and NH3-selective catalytic reduction (SCR) activities (mainly the low-temperature activities) of all the Cu-SAPO-34 catalysts declined after low-temperature steam treatment (LTST). These results show that the texture and acid density of Cu-SAPO-34 can be better preserved by increasing the Cu loading, although the hydrolysis of Si-O-Al bonds is inevitable. The stability of Cu ions and the stability of the SAPO framework were positively correlated at relatively low Cu loadings. However, a high Cu loading (e.g., 3.67 wt%) resulted in a significant decrease in the number of isolated Cu ions. Aggregation of CuO particles also occurred during the LTST, which accounts for the decreasing NH3 oxidation activities of the catalysts. Among the catalysts, Cu-SAPO-34 with a high Si content and medium Cu content (1.37 wt%) showed the lowest decrease in NH3-SCR because its Cu2+ content was well retained and its acid density was well preserved. (C) 2017, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
关键词[WOS]: COPPER SURFACE-AREA ;  CU/SAPO-34 CATALYSTS ;  NITROUS-OXIDE ;  NH3-SCR ;  AMMONIA ;  SAPO-34 ;  SCR ;  SO2 ;  IMPROVEMENT ;  CU-SSZ-13
语种: 英语
WOS记录号: WOS:000402346400017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152308
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Natl Engn Lab Methanol Olefins, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Xiang, Xiao,Wu, Pengfei,Cao, Yi,et al. Investigation of low-temperature hydrothermal stability of Cu-SAPO-34 for selective catalytic reduction of NOx with NH3[J]. CHINESE JOURNAL OF CATALYSIS,2017,38:918-927.
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