Mechanism study on gliding arc (GA) plasma reforming: Unraveling the decisive role of CH4/CO2 ratio in the dry reforming reaction

• Published in: Plasma processes and polymers 2023-04, Vol.20 (4), p.n/a
• Main Authors: Liu, Jing‐Lin, Xue, Zhuo‐Wen, Zhang, Zhi‐Yuan, Sun, Bing, Zhu, Ai‐Min
• Format: Article
• Language: English
• Subjects: Carbon dioxide; CH4/CO2; Dehydrogenation; dry reforming; Gliding; gliding arc; Methane; plasma kinetics; reaction mechanism; Reforming
• ISSN: 1612-8850; 1612-8869
• DOI: 10.1002/ppap.202200175

Aiming at understanding the role of CH4/CO2 ratio on gliding arc (GA)‐based dry reforming of methane (GA‐DRM), the GA‐DRM at CH4/CO2 ratio range of 0.11 to 1 was studied with kinetics simulation. The radicals of H, OH, and CH3 are identified as the main reactive species to induce the reactant conversion and product formation in GA‐DRM. The increase of CH4/CO2 raises the concentrations of H and CH3 and reduces the OH concentration. Subsequently, the CH4/CO2 ratio regulates the main reaction routes of GA‐DRM. The dehydrogenation coupling reaction enhances with CH4/CO2 and thus raises the selectivities of C2 hydrocarbons. The OH‐induced reactions for OH to H2O weaken with CH4/CO2, thereby increasing the H2 selectivity. The plasma kinetics simulation reveals that the radicals of CH3, H, and OH are the most important reactive species in the gliding arc (GA)‐reforming of methane (DRM). The process of GA‐DRM is achieved via six main reaction routes mainly induced by these radicals. CH4/CO2 plays a decisive role in the concentrations of these three radicals. Thus, the six main reaction routes are also strongly affected by the CH4/CO2. Consequently, the reaction pathways of GA‐DRM are regulated by the CH4/CO2 ratio.