Mechanism study of the promotional effect of O2on low-temperature SCR reaction on Fe-Mn/TiO2by DRIFT

Boqiong Jiang, Zhiguo Li, Shuncheng Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

74 Citations (Scopus)

Abstract

In this manuscript, the low-temperature SCR catalyst Fe-Mn/TiO2was prepared by sol-gel method, and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) was used for revealing the mechanism of the promotional effect of O2on low-temperature SCR reaction on Fe-Mn/TiO2. The experiments showed that surface OH species were consumed during NO adsorption, indicating that O2could promote the dehydration reaction of the manganese oxides to produce active oxygen, and greatly enhance the amount of NO complexes on the catalyst. NO removal was influenced by O2through two reaction ways. In the first reaction way, with the active oxygen obtained, coordinated NH3was easier to be activated. Active oxygen could abstract H from coordinated NH3, giving amide species to react with NO. In the second reaction way, with the active oxygen, much more bidentate nitrate could be formed from nitrosyl, and transformed to monodentate nitrate, producing new Brønsted acid sites to form NH4+. With more NO2obtained from the decomposition of monodentate nitrate in the presence of O2, NO could be removed effectively by the reaction between NH4+ and NO2.
Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalChemical Engineering Journal
Volume225
DOIs
Publication statusPublished - 1 Jun 2013

Keywords

  • Active oxygen
  • H abstraction
  • New Brønsted acid sites
  • NH4+ formation
  • NO removal

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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