Al-Anazi Abdulaziz, Kaydouh Marie-Nour, Bellahwel Omer, Ibrahim Ahmed A, Abahussain Abdulaziz A M, Srivastava Vijay Kumar, Fakeeha Anis H, Almuqati Naif S, Alotaibi Raja, Al-Fatesh Ahmed S, El Hassan Nissrine
Chemical Engineering Department, College of Engineering, King Saud University P.O. Box 800 Riyadh 11421 Saudi Arabia
Petroleum Engineering Program, School of Engineering, Lebanese American University P.O. Box 36 Byblos Lebanon
RSC Adv. 2025 Mar 19;15(11):8471-8479. doi: 10.1039/d4ra06426g. eCollection 2025 Mar 17.
Converting methane into syngas partial oxidation of methane (POM) is a promising energy-efficient technology given its exothermic nature. Active nickel-based catalysts suffer from deactivation by carbon deposition and sintering. This study explores the novel use of mordenite zeolite (CBV20A) as a catalytic support for nickel (Ni) and using strontium (Sr) as a promoter. NiSr /CBV20A samples with various Sr loadings were prepared and characterized using N-sorption, X-ray diffraction, H-temperature programmed reduction, temperature programmed desorption of CO, and Transmission Electron Microscopy. Sr addition improved NiO reducibility at lower temperature and boosted basicity, enhancing CH conversion and H yield. The optimal catalyst, NiSr/CBV20A, exhibited the highest performance with 72% CH conversion, 47% H yield, and 2.6 H/CO ratio at 700 °C and 14 400 mL g h. Results show that at a high gas hourly space velocity (GHSV) of 72 000 mL g h, a combustion and reforming reaction mechanism is preferred, while at a low GHSV of 14 400 mL g h, a direct partial oxidation mechanism predominates.
将甲烷转化为合成气——甲烷部分氧化（POM）因其放热特性而成为一项颇具前景的节能技术。活性镍基催化剂会因积碳和烧结而失活。本研究探索了丝光沸石（CBV20A）作为镍（Ni）的催化载体以及使用锶（Sr）作为促进剂的新用途。制备了具有不同Sr负载量的NiSr /CBV20A样品，并使用N吸附、X射线衍射、H程序升温还原、CO程序升温脱附和透射电子显微镜进行了表征。添加Sr提高了NiO在较低温度下的还原性并增强了碱性，提高了CH转化率和H产率。最佳催化剂NiSr/CBV20A在700℃和14400 mL g h条件下表现出最高性能，CH转化率为72%，H产率为47%，H/CO比为2.6。结果表明，在72000 mL g h的高气时空速（GHSV）下，燃烧和重整反应机制占主导，而在14400 mL g h的低GHSV下，直接部分氧化机制占主导。
