Utilization of CO2 in non-catalytic dry reforming of C1–C4 hydrocarbons. Issue 47 (May 2021)

• Record Type: Journal Article
• Authors: Savchenko, V.I.; Zimin, Ya.S.; Nikitin, A.V.; Sedov, I.V.; Arutyunov, V.S.
• Is Part Of: Journal of CO₂ utilization. Issue 47(2021)
• Publication Date: 2021-05
• Subjects: CO2utilization -- Dry reforming -- Steam reforming -- Syngas -- Methane -- Hydrocarbons -- Acetylene; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2021.101490
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: Utilization of CO2 in non-catalytic matrix reforming of hydrocarbons. The first stage of the dry reforming of hydrocarbons is their pyrolysis. Acetylene is the main intermediate of dry reforming of all hydrocarbons. CO2 mainly reacts with H radicals, which are formed during the pyrolysis. Abstract: A kinetic and thermodynamic analysis of CO2 utilization through non-catalytic dry (carbon dioxide) reforming of light hydrocarbons C1 – C4 in the temperature range of 1400–1800 K is performed. The sequence of stages of transformation of hydrocarbons into syngas and corresponding time intervals are determined. In this temperature range, methane is successively pyrolyzed into ethylene and then acetylene, the subsequent conversion of which leads to the formation of CO and H2 . Hydrocarbons C2+ are also rapidly pyrolyzed mainly into ethylene and methane and then into acetylene, without any noticeable participation of CO2 . The conversion of CO2 begins after a noticeable conversion of the hydrocarbons due to its reaction with H atoms formed in the system and leads to the formation of CO and OH radicals. The acetylene formed is mainly converted through its reaction with OH radicals. Then, the dry and steam reforming of the acetylene and methane residues yields the final products. The results obtained demonstrate the possibility of the efficient utilization of CO2 in the reforming of hydrocarbons with an enhanced yield of syngas.