Effect of transition metal additives on the catalytic performance of Cu-Mn/SAPO-34 for selective catalytic reduction of NO with NH3 at low temperature

Guofu Liu, Wenjie Zhang, Pengfei He, Dekui Shen*, Chunfei Wu, Chenghong Gong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
81 Downloads (Pure)

Abstract

The adsorption of NO, NH3, H2O, and SO2 gaseous molecules on different transition metal oxides was studied based on density function theory (DFT), and three better-performing transition metal elements (Fe, Co, and Ce) were selected. Cu-Mn/SAPO-34 catalysts were prepared by impregnation method and then modified by the selected transition metals (Fe, Co, and Ce); the SO2 resistance experiments and characterizations including Brunner-Emmet-Teller (BET), X-ray Diffraction (XRD), Scanning Electronic Microscopy (SEM), and thermal gravity analysis (TG)-differential thermal gravity (DTG) before and after SO2 poisoning were conducted. The results showed that the deactivation of the Cu-Mn/SAPO-34 catalyst is ascribed to the deposition of lots of ammonium sulfates on the surface, depositing on the active sites and inhibiting the adsorption of NH3. After the modification of Fe, Co, and Ce oxides, the SO2 resistance of the modified Cu-Mn/SAPO-34 catalyst was significantly enhanced due to the less formation of ammonium sulfates. Among all these modified Cu-Mn/SAPO-34 catalysts, the Cu-Mn-Ce/SAPO-34 exhibited the highest SO2 resistance owing to the decreased decomposition temperature and the trapper of ceria for capturing SO2 to form Ce(SO4)2, further inhibiting the deposition of ammonium sulfates.

Original languageEnglish
Article number685
JournalCatalysts
Volume9
Issue number8
DOIs
Publication statusPublished - 13 Aug 2019

Keywords

  • DFT
  • Selective catalytic reduction
  • SO
  • Transition metal additives

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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