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Improving the low-temperature hydrothermal stability of Cu-SAPO-34 by the addition of Ag for ammonia selective catalytic reduction of NOx

文献类型：期刊论文

作者Xiang, Xiao1,2; Cao, Yi1; Sun, Lijing1,2; Wu, Pengfei1,2; Cao, Lei1; Xu, Shutao1; Tian, Peng1; Liu, Zhongmin1
刊名APPLIED CATALYSIS A-GENERAL
出版日期2018-02-05
卷号551页码:79-87
关键词Cu-sapo-34 Cuag-sapo-34 Hydrothermal Stability Nh3-scr
ISSN号0926-860X
DOI10.1016/j.apcata.2017.12.001
文献子类Article
英文摘要Ag promoted Cu-SAPO-34 has been developed to improve the low-temperature hydrothermal stability of Cu-SAPO-34 for the NH3-SCR reaction. Kinetic tests show that the addition of Ag into Cu-SAPO-34 doesn't change the reaction mechanism. The ion-exchanged Ag species, which decrease the Bronsted acid density and provide more Lewis acid sites with moderate acidity, have a protective effect on the SAPO framework against low temperature steaming treatment (LTST). Higher surface Cu content is observed for CuAg2.25-SAPO-34, although CuAg2.23-SAPO-34 and Cu-SAPO-34 have similar content of isolated Cu ions. In situ DRIFTS studies demonstrate, for the first time, the NH3 molecules adsorbed on the weak/moderate acid sites (independent of the acid types such as Bronsted acid or Lewis acid) are more active than on the strong acid sites for the low-temperature SCR reaction. Compared with the original catalyst Cu-SAPO-34, the enhanced SCR activity of CuAg2.25-SAPO-34 after LTST is ascribed to the better preservation of total acid sites, higher moderate acid density (Lewis acid sites) and larger amount of surface Cu species on the CuAg2.25-SAPO-34 catalyst.
WOS关键词DIFFERENT FRAMEWORK TOPOLOGIES ; ELECTRON-SPIN-RESONANCE ; ADSORBATE INTERACTION ; CU/SAPO-34 CATALYSTS ; ECHO MODULATION ; CU(II) LOCATION ; COMBINED FTIR ; NITRIC-OXIDE ; SITU-DRIFTS ; CU SITES
WOS研究方向Chemistry ; Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000425555600008
出版者ELSEVIER SCIENCE BV
源URL[http://cas-ir.dicp.ac.cn/handle/321008/168806]  
专题大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者Tian, Peng; Liu, Zhongmin
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Natl Engn Lab Methanol Olefins, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Xiang, Xiao,Cao, Yi,Sun, Lijing,et al. Improving the low-temperature hydrothermal stability of Cu-SAPO-34 by the addition of Ag for ammonia selective catalytic reduction of NOx[J]. APPLIED CATALYSIS A-GENERAL,2018,551:79-87.
APA Xiang, Xiao.,Cao, Yi.,Sun, Lijing.,Wu, Pengfei.,Cao, Lei.,...&Liu, Zhongmin.(2018).Improving the low-temperature hydrothermal stability of Cu-SAPO-34 by the addition of Ag for ammonia selective catalytic reduction of NOx.APPLIED CATALYSIS A-GENERAL,551,79-87.
MLA Xiang, Xiao,et al."Improving the low-temperature hydrothermal stability of Cu-SAPO-34 by the addition of Ag for ammonia selective catalytic reduction of NOx".APPLIED CATALYSIS A-GENERAL 551(2018):79-87.

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来源：大连化学物理研究所

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