Catalytic methane decomposition on CNT-supported Fe-catalysts.

Autor: Yang M; Beijing University of Chemical Technology, Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, 100029, Beijing, China., Baeyens J; Beijing University of Chemical Technology, Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, 100029, Beijing, China., Li S; Beijing University of Chemical Technology, Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, 100029, Beijing, China., Li Z; Beijing University of Chemical Technology, College of Life Science and Technology, 100029, Beijing, China., Zhang H; Beijing University of Chemical Technology, College of Life Science and Technology, 100029, Beijing, China. Electronic address: Zhhl@buct.edu.cn.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2024 Aug; Vol. 365, pp. 121592. Date of Electronic Publication: 2024 Jul 03.
DOI: 10.1016/j.jenvman.2024.121592
Abstrakt: Methane, either as natural gas or as a resource obtained from various bioprocesses (e.g., digestion, landfill) can be converted to carbon and hydrogen according to. CH 4 (g)→C(s)+2H 2 (g)ΔH 298K =74.8kJ/mol. Previous research has stressed the growing importance of substituting the high-temperature Steam Methane Reforming (SMR) by a moderate temperature Catalytic Methane Decomposition (CMD). The carbon formed is moreover of nanotube nature, in high industrial demand. To avoid the use of an inert support for the active catalyst species, e.g., Al 2 O 3 for Fe, leading to a progressive contamination of the catalyst by support debris and coking of the catalyst, the present research investigates the use of carbon nanotubes (CNTs) as Fe-support. Average CH 4 conversions of 75-85% are obtained at 700 °C for a continuous operation of 40 h. The produced CNT from the methane conversion can be continuously removed from the catalyst bed by carry-over due to its bulk density difference (∼120 kg/m 3 ) with the catalyst itself (∼1500 kg/m 3 ). CNT properties are fully specified. No thermal regeneration of the catalyst is required. A tentative process layout and economic analysis demonstrate the scalability of the process and the very competitive production costs of H 2 and CNT.
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 Ltd. All rights reserved.)
Databáze: MEDLINE
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