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The enhancement of Zn resistance of Mn/TiO 2 catalyst for NH 3 -SCR reaction by the modification with Al 2 (SO 4 ) 3

Journal of the Taiwan Institute of Chemical Engineers, ISSN: 1876-1070, Vol: 78, Page: 370-377
2017
  • 25
    Citations
  • 0
    Usage
  • 9
    Captures
  • 0
    Mentions
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Metrics Details

  • Citations
    25
    • Citation Indexes
      25
  • Captures
    9

Article Description

Heavy metals such as Zn have a poisoning effect on the catalyst for selective catalytic reduction of NO x with NH 3. In this study, it was found that the modification of Mn/TiO 2 catalyst with Al 2 (SO 4 ) 3 could effectively enhance its Zn resistance. From the results of characterizations including XRD, H 2 -TPR, NH 3 -TPD and XPS, it could be concluded that the lower crystallinity, the higher reducibility, the generation of more acid sites, and the presence of more Mn 4+ and chemisorbed oxygen should mainly contribute to the good Zn resistance of Al 2 (SO 4 ) 3 -modified Mn/TiO 2 catalyst. The results of in situ DRIFT study indicated that the addition of Al 2 (SO 4 ) 3 did not change the mechanism of NH 3 -SCR reaction over Mn/TiO 2 catalyst, which was under the control of both Eley–Rideal and Langmuir–Hinshelwood mechanisms.

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