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Author:

Wei, Lu (Wei, Lu.) | Cui, Suping (Cui, Suping.) (Scholars:崔素萍) | Guo, Hongxia (Guo, Hongxia.) (Scholars:郭红霞) | Ma, Xiaoyu (Ma, Xiaoyu.) | Wan, Yeqiang (Wan, Yeqiang.) | Yu, Susu (Yu, Susu.)

Indexed by:

EI Scopus SCIE

Abstract:

The mechanism of deactivation of MnOx/TiO2 is studied. The MnOx/TiO2 catalyst prepared by co-precipitation method has poor stability, the NO conversion decreased to about 50% after 100 h denitrification. Catalyst activity and physicochemical properties of the catalyst before and after SCR denitrification were compared and analyzed through BET, XRD, SEM, which indicated that dispersion of active sites and surface area of catalyst were decreased after 100 h denitrification. Catalyst activity and surface chemical compositions were investigated by XPS, H-2-TPR, NH3-TPD, which shown that content of Mn3+ and chemisorbed oxygen on the surface decreases. The different active sites of catalyst and adsorption characteristics of reacting gases (NH3 and NO) over catalyst before and after denitrification was investigated through in-situ DRIFT. It was found that NO is more easily adsorbed on the surface of catalyst than NH3 and form nitrate. The nitrate that did not participate in the reaction gradually accumulate on the surface of the catalyst, which inhibits the adsorption of NH3. This is the main reason for the deactivation of the catalyst.

Keyword:

Deactivation, low-temperature SCR Catalytic stability Manganese-based catalyst

Author Community:

  • [ 1 ] [Wei, Lu]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Cui, Suping]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Guo, Hongxia]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Ma, Xiaoyu]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Wan, Yeqiang]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 6 ] [Yu, Susu]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 7 ] [Cui, Suping]Beijing Univ Technol, Beijing Ecoenvironm Mat & Evaluat Engn Res Ctr, Beijing 100124, Peoples R China

Reprint Author's Address:

  • 崔素萍

    [Cui, Suping]Pingleyuan 100, Beijing 100124, Peoples R China

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Source :

APPLIED SURFACE SCIENCE

ISSN: 0169-4332

Year: 2019

Volume: 483

Page: 391-398

6 . 7 0 0

JCR@2022

ESI Discipline: MATERIALS SCIENCE;

ESI HC Threshold:211

JCR Journal Grade:1

Cited Count:

WoS CC Cited Count: 38

SCOPUS Cited Count: 41

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 3

Online/Total:1000/5341005
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