A study of the mechanism of low-temperature SCR of NO with NH3 on MnOx/CeO2

Li Xu, Xiao Song Li, Mark Crocker, Zhao Shun Zhang, Ai Min Zhu, Chuan Shi

Research output: Contribution to journalArticlepeer-review

118 Scopus citations

Abstract

A MnOx/CeO2 supported catalyst was prepared using the deposition-precipitation (DP) method for low-temperature selective catalytic reduction (SCR) of NO with NH3. At short reaction time, nearly 100% NO conversion was obtained across the whole evaluated temperature range of 80-150 C at a space velocity of 50,000 h-1. The catalyst rapidly lost its activity at 80 C, while stable activity was achieved at 120 C at a space velocity of 120,000 h-1 in a 36 h test. A possible reaction pathway is proposed based on the results of an in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) study coupled with mass spectrometric (MS) data. It is suggested that the NH3-SCR reaction on the MnO x/CeO2 catalyst involves a [NH3â̄ NO-] complex as an intermediate, the decomposition of which into N2 and H2O is the rate-limiting step. The role of oxygen in the SCR reaction is to reoxidize the reduced catalyst surface, thereby completing the catalytic cycle.

Original languageEnglish
Pages (from-to)82-90
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume378
DOIs
StatePublished - 2013

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (Nos. 20573014 and 21073024 ), Natural Science Foundation of Liaoning Province ( 201102034 ), as well as by the Fundamental Research Funds for the Central Universities (No. DUT12LK23 ).

Keywords

  • Deposition-precipitation
  • Low temperature
  • Mechanism
  • MnO/CeO
  • NH-SCR

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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