In situ-DRIFTS Study of Sb–V–CeO2/TiO2 Catalyst Under Standard and Fast NH3-SCR Conditions

Young Eun Jeong, Pullur Anil Kumar, Danh Thi Huong, Heon Phil Ha, Kwan Young Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, the NOx conversion under standard and fast SCR conditions on the Sb–V–CeO2/TiO2 catalyst has been conducted in the temperature range of 150–400 °C. The Sb–V–CeO2/TiO2 catalyst, under both fast and standard NH3-SCR conditions, showed higher NOx conversion than the commercial V2O5/WO3–TiO2 catalyst at low temperatures. In comparison to the V2O5/WO3–TiO2 catalyst, the NO oxidation to NO2 was promoted for the Sb–V–CeO2/TiO2 catalyst at the temperatures between 150 and 400 °C. The in-situ DRIFTS studies at 200 °C on the Sb–V–CeO2/TiO2 catalyst surface indicated the IR bands assigned to NO2, nitrate species and ammonia adsorbed species assigned to Brønsted and Lewis acid sites under both standard and fast SCR conditions. Furthermore, in-situ DRIFTS results of Sb–V–CeO2/TiO2 catalyst revealed that the formation of surface adsorbed NO2, bridged nitrate and bidentate nitrate species. The reduction of nitrates to nitrites is induced by NO2, which reacts with the adsorbed ammonium species forming intermediate NH4NO2. Eventually, this is converted to N2 and H2O in both SCR conditions.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalTopics in Catalysis
DOIs
Publication statusAccepted/In press - 2017 Apr 19

Fingerprint

Thyristors
Catalysts
Nitrates
Lewis Acids
Nitrites
Ammonium Compounds
Ammonia
Temperature
Oxidation
Acids

Keywords

  • Fast and standard SCR conditions
  • In-situ DRIFTS
  • Low temperature
  • Nitrate species
  • NO oxidation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

In situ-DRIFTS Study of Sb–V–CeO2/TiO2 Catalyst Under Standard and Fast NH3-SCR Conditions. / Jeong, Young Eun; Kumar, Pullur Anil; Huong, Danh Thi; Ha, Heon Phil; Lee, Kwan Young.

In: Topics in Catalysis, 19.04.2017, p. 1-8.

Research output: Contribution to journalArticle

Jeong, Young Eun ; Kumar, Pullur Anil ; Huong, Danh Thi ; Ha, Heon Phil ; Lee, Kwan Young. / In situ-DRIFTS Study of Sb–V–CeO2/TiO2 Catalyst Under Standard and Fast NH3-SCR Conditions. In: Topics in Catalysis. 2017 ; pp. 1-8.
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abstract = "In this study, the NOx conversion under standard and fast SCR conditions on the Sb–V–CeO2/TiO2 catalyst has been conducted in the temperature range of 150–400 °C. The Sb–V–CeO2/TiO2 catalyst, under both fast and standard NH3-SCR conditions, showed higher NOx conversion than the commercial V2O5/WO3–TiO2 catalyst at low temperatures. In comparison to the V2O5/WO3–TiO2 catalyst, the NO oxidation to NO2 was promoted for the Sb–V–CeO2/TiO2 catalyst at the temperatures between 150 and 400 °C. The in-situ DRIFTS studies at 200 °C on the Sb–V–CeO2/TiO2 catalyst surface indicated the IR bands assigned to NO2, nitrate species and ammonia adsorbed species assigned to Br{\o}nsted and Lewis acid sites under both standard and fast SCR conditions. Furthermore, in-situ DRIFTS results of Sb–V–CeO2/TiO2 catalyst revealed that the formation of surface adsorbed NO2, bridged nitrate and bidentate nitrate species. The reduction of nitrates to nitrites is induced by NO2, which reacts with the adsorbed ammonium species forming intermediate NH4NO2. Eventually, this is converted to N2 and H2O in both SCR conditions.",
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