Nitrous Oxide Adsorption and Decomposition on Zeolites and Zeolite-like Materials

Leonid M Kustov; Sergey F Dunaev; Alexander L Kustov

doi:10.3390/molecules27020398

Nitrous Oxide Adsorption and Decomposition on Zeolites and Zeolite-like Materials

Molecules. 2022 Jan 8;27(2):398. doi: 10.3390/molecules27020398.

Authors

Leonid M Kustov^{1

2

3}, Sergey F Dunaev^{1

2

3}, Alexander L Kustov^{1

2

3}

Affiliations

¹ Chemistry Department, Moscow State University, 1 Leninskie Gory, Bldg. 3, 119991 Moscow, Russia.
² N.D. Zelinsky Institute of Organic Chemistry RAS, 47 Leninsky Prosp., 119991 Moscow, Russia.
³ Institute of Ecotechnologies and Engineering, National University of Science and Technology MISiS, 4 Leninsky Prosp., 119049 Moscow, Russia.

Abstract

Decomposition of N₂O on modified zeolites, crystalline titanosilicalites, and related amorphous systems is studied by the catalytic and spectroscopic methods. Zinc-containing HZSM-5 zeolites and titanosilicalites with moderate Ti/Si ratios are shown to exhibit a better catalytic performance in N₂O decomposition as compared with conventionally used Cu/HZSM-5 zeolites and amorphous Cu-containing catalysts. Dehydroxylation of the HZSM-5 zeolite by calcination at 1120 K results in an enhancement of the N₂O conversion. The mechanism of the reaction and the role of coordinatively unsaturated cations and Lewis acid sites in N₂O decomposition are discussed on the basis of the spectroscopic data.

Keywords: HZSM-5 zeolite; Lewis acid sites; N2O decomposition; diffuse-reflectance IR spectroscopy; titanosilicalites.