Cooperative and competitive adsorption mechanism of NO2, NO, and H2O on H-type mordenite

Z. M. Wang; T. Arai; M. Kumagai

Cooperative and competitive adsorption mechanism of NO₂, NO, and H₂O on H-type mordenite

Z. M. Wang, T. Arai, M. Kumagai

Research output: Contribution to journal › Article

Abstract

To elucidate the interaction mechanism of NO_x (NO₂ and NO) and H₂O on the surface of H-type mordenite (HM), the dynamic adsorption properties of NO₂ + H₂O + O₂ and NO + H₂O + O₂ mixtures were examined and the surface reaction of NO_x and H₂O was studied by an in-situ FT-IR spectroscopic method. It was found that NO₂ can be dissociatively adsorbed on two kinds of adsorption sites on HM to form nitric acid like species by interacting with Brønsted acid sites, whereas NO + O₂ + H₂O adsorption is a competitive process of NO oxidation and H₂O adsorption without leading to formation of nitric acid like species. The difference between NO₂ adsorption sites and NO oxidation sites gives rise to the difference in their breakthrough properties. Adsorption/catalytic reaction models are proposed based on column adsorption and FT-IR results.

Original language	English
Pages (from-to)	1864-1871
Number of pages	8
Journal	Industrial and Engineering Chemistry Research
Volume	40
Issue number	8
Publication status	Published - 2001 Apr 18

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ASJC Scopus subject areas

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

Cite this

Wang, Z. M., Arai, T., & Kumagai, M. (2001). Cooperative and competitive adsorption mechanism of NO₂, NO, and H₂O on H-type mordenite. Industrial and Engineering Chemistry Research, 40(8), 1864-1871.

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abstract = "To elucidate the interaction mechanism of NOx (NO2 and NO) and H2O on the surface of H-type mordenite (HM), the dynamic adsorption properties of NO2 + H2O + O2 and NO + H2O + O2 mixtures were examined and the surface reaction of NOx and H2O was studied by an in-situ FT-IR spectroscopic method. It was found that NO2 can be dissociatively adsorbed on two kinds of adsorption sites on HM to form nitric acid like species by interacting with Br{\o}nsted acid sites, whereas NO + O2 + H2O adsorption is a competitive process of NO oxidation and H2O adsorption without leading to formation of nitric acid like species. The difference between NO2 adsorption sites and NO oxidation sites gives rise to the difference in their breakthrough properties. Adsorption/catalytic reaction models are proposed based on column adsorption and FT-IR results.",

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