IR-spectroscopic study of complex formation of nitrogen oxides (NO, N2O) with strong Lewis acid sites and the reactivity of adsorbed species in CO and CH4 oxidation

Leonid M Kustov; Sergei F Dunaev; Elena D Finashina; Alexander L Kustov

doi:10.1016/j.saa.2022.122224

IR-spectroscopic study of complex formation of nitrogen oxides (NO, N₂O) with strong Lewis acid sites and the reactivity of adsorbed species in CO and CH₄ oxidation

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Mar 15:289:122224. doi: 10.1016/j.saa.2022.122224. Epub 2022 Dec 7.

Authors

Leonid M Kustov¹, Sergei F Dunaev², Elena D Finashina², Alexander L Kustov³

Affiliations

¹ Chemistry Department, Moscow State University, 1 Leninskie Gory, bldg. 3, Moscow 119991 Russia; N.D. Zelinsky Institute of Organic Chemistry RAS, 47 Leninsky prosp., Moscow 119991 Russia; National University of Science and Technology "MISiS", Leninsky prosp. 4, Moscow, Russia. Electronic address: lmkustov@mail.ru.
² Chemistry Department, Moscow State University, 1 Leninskie Gory, bldg. 3, Moscow 119991 Russia.
³ Chemistry Department, Moscow State University, 1 Leninskie Gory, bldg. 3, Moscow 119991 Russia; N.D. Zelinsky Institute of Organic Chemistry RAS, 47 Leninsky prosp., Moscow 119991 Russia; National University of Science and Technology "MISiS", Leninsky prosp. 4, Moscow, Russia.

PMID: 36508907
DOI: 10.1016/j.saa.2022.122224

Abstract

The formation of complexes and transformations of nitrogen oxides (NO, N₂O) on strong Lewis acid sites of HZSM-5, H[Ga]ZSM-5, ZnO/HZSM-5 zeolites and dealuminated mordenites was investigated by diffuse-reflectance IR spectroscopy. Adsorbed N₂O that is formed by disproportionation of NO is capable of oxidizing CO and CH₄ molecules to CO₂. The behaviour of strong Lewis acid sites in zeolites and cationic forms of zeolites in the NO disproportionation and CO or CH₄ oxidation was comparatively studied.

Keywords: CH(4) oxidation; CO oxidation; Lewis acid sites; NO disproportionation; Nitrogen oxides; Zeolites.