Non-thermal plasma mitigation of low concentration of air pollutants: removal of isopropyl alcohol using transition metal-oxide integration.

Autor: Kandukuri B; Department of Chemistry, Indian Institute of Technology Hyderabad, Telangana, 502 285, India., Das S; Department of Chemistry, Indian Institute of Technology Hyderabad, Telangana, 502 285, India., Mudadla UR; Department of Chemistry, Indian Institute of Technology Hyderabad, Telangana, 502 285, India., Madras G; Department of Chemical Engineering, Indian Institute of Technology Hyderabad, Telangana, 502 285, India., Thatikonda S; Department of Civil Engineering, Indian Institute of Technology Hyderabad, Telangana, 502 285, India., Challapalli S; Department of Chemistry, Indian Institute of Technology Hyderabad, Telangana, 502 285, India. csubbu@iith.ac.in.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Feb 28. Date of Electronic Publication: 2024 Feb 28.
DOI: 10.1007/s11356-024-32569-7
Abstrakt: The present work studied the decomposition of isopropyl alcohol (IPA), widely used in chemical industries and households, in a packed-bed dielectric barrier discharge (DBD) plasma reactor. Metal oxide (MO x ) coated on γ-Al 2 O 3 (M = Cu, Mn, Co) was utilized for packing. The plasma-packed mode was a likely alternative to the conventional removal techniques, as it aids the conversion of dilute concentrations of IPA to CO and CO 2 at ambient conditions (room temperature and atmospheric pressure). The mean electron energy calculations suggest that electrons with higher energy are generated when the discharge zone is packed with catalysts. When comparing IPA conversion (input concentration of 25 ppm) for no packing mode and MO x /γ-Al 2 O 3 coupled plasma mode, the latter method enhances conversion to greater than 90% at an applied voltage of 18 kV. Also, MO x /γ-Al 2 O 3 showed the highest selectivity to CO 2 (70%) compared to plasma-only mode (45%). The metal-oxide layer provides the necessary catalytic surface facilitating the oxidation of IPA to CO x through active oxygen species or the interaction of surface hydroxyl groups. The use of MO x /γ-Al 2 O 3 resulted in about 90% carbon balance and reduced ozone generation, demonstrating the significance of integrating metal oxide to achieve efficient conversion and maximal selectivity towards the desired products.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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