Bi-reforming of methane in a carbon deposit-free plasmatron with high operational adaptability

Wang, K and Zhang, H and J, A and Rao, L and Lin, X and Wan, J and Long, Y and Gao, M and Wang, W and Tu, X and Li, X and Huang, Q (2023) Bi-reforming of methane in a carbon deposit-free plasmatron with high operational adaptability. In: Fuel Processing Technology, 248 .

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Abstract

An atmospheric plasmatron reactor with two-stage inlets was developed for bi-reforming of methane (CO2/CH4/H2O) to produce syngas (H2 + CO) and value-added liquid products. The influence of CH4 inlet position, gas flow rate and reactant composition were investigated. The results showed that the two-stage-inlet design allows for a wide range of operational conditions in terms of the CO2/CH4/H2O ratio (2–7:0–6:0–3) and total flow rate (4.5-11 L/min). A CO2 and CH4 conversion of 24% and 12.9%, respectively, was obtained at flow rates of up to 7-8 L/min, with no observable carbon deposit formed. A closer injection of CH4 to the core plasma area was more beneficial for both reactant conversion and syngas selectivity. Interestingly, value-added oxygenated products (e.g., methanol, ethanol, acetic acid) were produced simultaneously, offering a promising power-to-liquid (PtL) route. In particular, the direct synthesis of acetic acid from CH4 and CO2 was achieved, which is infeasible in thermocatalytic processes. A small addition of H2O (14.3%) favorably enhanced the formation of acetic acid by up to 160%, likely due to the improved generation of CH3 and COOH intermediates. Overall, this work offers a promising route for syngas and oxygenated products generation in a scalable plasmatron reactor with high operational adaptability.

Item Type:	Journal Article
Publication:	Fuel Processing Technology
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Acetic acid; Bismuth compounds; Carbon; Deposits; Flow of gases; Methane; pH; Synthesis gas, Bi-reforming; Carbon deposites; CH 4; CH4 conversion; CO2 conversion; Liquid products; Oxygenated products; Plasmatrons; Reforming of methane; Syn gas, Carbon dioxide
Department/Centre:	Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Date Deposited:	14 Jun 2023 13:21
Last Modified:	14 Jun 2023 13:21
URI:	https://eprints.iisc.ac.in/id/eprint/81930

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