Abstract Dry reforming of methane (DRM) to syngas in a dielectric barrier discharge (DBD) plasma reactor over Ni-loaded ɤ-Al2O3-MgO nanocomposite catalysts has been investigated. The catalysts are prepared by modified incipient wetness impregnation method, assisted by cold plasma treatment. The samples are characterized by XRD, N2 adsorption-desorption, H2-TPR, CO2-TPD, FESEM and EDX. The performance of the catalyst for DRM is evaluated at various specific input energy (SIE J ml−1) and gas hourly space velocity (GHSV, h−1). The maximum conversion achieved are 74.5% and 73% for CH4 and CO2 respectively, over 10% Ni/ɤ-Al2O3-MgO at specific input energy (SIE) = 300 J ml−1 and gas hourly space velocity (GHSV) = 364 h−1. The main reaction products are H2 (29.5%), CO (30.5%) with H2/CO = 1 inferring RWGS reaction is suppressed for 12 h operation time. The enhanced conversion and yield are due to the strong metal-support interaction, high Lewis basicity and stable 10% Ni/ɤ-Al2O3-MgO catalyst as well as the plasma-catalyst interface. The energy efficiency (EE) of the plasma-catalytic DRM is higher (0.117 mmol kJ−1) compared to plasma only (0.087 mmol kJ−1) demonstrating the synergy between catalyst and plasma. The reaction mechanism is also proposed to postulate the steps involved in the DRM.

中文翻译：

---

用于在 Ni/ɤ-Al 2 O 3 -MgO 纳米复合材料上干法重整甲烷的冷等离子体介质阻挡放电反应器

摘要 研究了在载有 Ni 的 ɤ-Al2O3-MgO 纳米复合催化剂上，在介质阻挡放电 (DBD) 等离子体反应器中将甲烷 (DRM) 干法重整为合成气。催化剂采用改良的初湿浸渍法，辅以冷等离子体处理制备。通过XRD、N2吸附-解吸、H2-TPR、CO2-TPD、FESEM和EDX对样品进行表征。在各种特定输入能量 (SIE J ml-1) 和气时空速 (GHSV, h-1) 下评估 DRM 催化剂的性能。CH4 和 CO2 的最大转化率分别为 74.5% 和 73%，在特定输入能量 (SIE) = 300 J ml-1 和气时空速 (GHSV) = 364 h 时超过 10% Ni/ɤ-Al2O3-MgO -1。主要反应产物是 H2 (29.5%)、CO (30.5%)，其中 H2/CO = 1，推断 RWGS 反应被抑制了 12 小时的操作时间。转化率和产率的提高是由于强金属-载体相互作用、高路易斯碱度和稳定的 10% Ni/ɤ-Al2O3-MgO 催化剂以及等离子体-催化剂界面。与仅等离子体 (0.087 mmol kJ-1) 相比，等离子体催化 DRM 的能量效率 (EE) 更高 (0.117 mmol kJ-1)，证明了催化剂和等离子体之间的协同作用。还提出了反应机制来假设 DRM 中涉及的步骤。