Low-temperature thermocatalytic removal of formaldehyde in air using copper manganite spinels.

Autor: Hua Y; Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, Republic of Korea., Vikrant K; Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, Republic of Korea., Kim KH; Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, Republic of Korea. Electronic address: kkim61@hanyang.ac.kr., Heynderickx PM; Center for Green Chemistry and Environmental Biotechnology (GREAT), Engineering of Materials Via Catalysis and Characterization, Ghent University Global Campus, 119-5 Songdo Munhwa-ro, Yeonsu-gu, Incheon, 406-840, Republic of Korea; Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Ghent, Belgium. Electronic address: philippe.heynderickx@ghent.ac.kr., Boukhvalov DW; College of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing, 210037, China; Institute of Physics and Technology, Ural Federal University, Mira Street 19, 620002, Yekaterinburg, Russia.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2024 Aug 15; Vol. 255, pp. 119186. Date of Electronic Publication: 2024 May 20.
DOI: 10.1016/j.envres.2024.119186
Abstrakt: The removal of formaldehyde (FA) is vital for indoor air quality management in light of its carcinogenic propensity and adverse environmental impact. A series of copper manganite spinel structures (e.g., CuMn 2 O 4 ) are prepared using the sol-gel combustion method and treated with reduction or oxidation pretreatment at 300 °C condition. Accordingly, CuMn 2 O 4 -O ("O" suffix for oxidation pre-treatment in air) is identified as the best performer to achieve 100% conversion (X FA ) of FA (50 ppm) at 90 °C; its performance, if assessed in terms of reaction kinetic rate (r) at X FA  = 10%, is 5.02E-03 mmol g -1 h -1 . The FA removal performance increases systematically with decreases in flow rate, FA concentration, and relative humidity (RH) or with increases in bed mass. The reaction pathways and intermediates of FA catalytic oxidation on CuMn 2 O 4 -A are studied with density functional theory simulations, temperature-programmed characterization experiments, and in-situ diffuse reflectance infrared Fourier transform spectroscopy. The synergistic combination of large quantities of adsorbed oxygen (O A ) species and oxidized metal species (e.g., Cu 2+ ) contribute to the enhanced catalytic performance of CuMn 2 O 4 -O to oxidize FA into CO 2 with the reaction intermediates of H 2 CO 2 (DOM), HCOO - , and CO. The present study is expected to provide valuable insights into the thermocatalytic oxidation of FA over spinel CuMn 2 O 4 materials and their catalytic performances in relation to the key process variables.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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