Partial oxidation of methane into syngas (H₂聽+聽CO) over effective high-dispersed Ni/SiO₂ catalysts synthesized by a sol-gel method

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• 作者：Wen-Sheng Xia ; ^{wsxia@xmu.edu.cn} ; Yu-Hui Hou ; Gang Chang ; Wei-Zheng Weng ; Guo-Bin Han ; Hui-Lin Wan ; ^{hlwan@xmu.edu.cn}
• 关键词：POM ; Synthesis gas ; Sol&ndash ; gel ; High-dispersed Ni catalyst ; Stability
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：May, 2012
• 卷：37
• 期：10
• 页码：8343-8353
• 文件大小：1707 K

摘要

A Ni catalyst supported on mono dispersed silica spheres, Ni/SiO₂-Sph (SG), has been successfully synthesized by a sol-gel method. By comparing it with other Ni catalysts (supported on commercial silica and silica spheres) prepared by an impregnation method, we find that the size of Ni particles and their dispersion are closely related to performances of the catalysts in partial oxidation of methane (POM) into synthesis gas (CO聽+聽H₂). Several means such as H₂-TPR, TEM, and XRD are employed to characterize these catalysts. Although the catalyst Ni/SiO₂-Sph (SG) in specific surface area is not large, the Ni particles are the smallest in size (3-5聽nm) among the three catalysts, and are uniformly distributed, high dispersed over the silica surfaces, being not much changed as Ni loading. It is notable that the smaller size of the NiO particles is corresponding to the stronger NiO-SiO₂ interactions. The catalyst Ni/SiO₂-Sph (SG) shows the best catalytic performances and the longest lifetime among the three catalysts at the POM conditions.