Autothermal Reforming of CH4 and C3H8 to Syngas in a Fluidized-Bed Reactor

The catalytic properties of Ni/SiO2 catalysts with different Ni particle size for the oxy-reforming of methane or methane-propane with CO2 and O2 (autothermal reforming) in a fluidized-bed reactor were investigated. The results show that Ni/SiO2 catalysts with smaller Ni particle size exhibit higher catalytic activity and improved resistance to carbon deposition. The conversion of methane and carbon dioxide was 75.5% and 72.6%, respectively, for the methane-propane autothermal reforming reaction. The propane dissociates and is oxidized more easily than methane. The CHx intermediate species from propane dissociation combines with the adsorbed hydrogen to produce methane, which results in a decrease in the apparent conversion of methane. Additionally, H2 and CO are generated by the reaction with adsorbed CO2, which promotes the conversion of CO2.

摘 要：在流化床反应器中, 考察了 Ni/SiO2 催化剂上 CH4 或  CH4-C3H8 临氧 CO2 重整 (自热重整) 制合成气反应性能. 结果表明, 在 CH4-C3H8 混合气自热重整反应中, Ni 粒径较小催化剂的活性和抗积炭性能较高, CH4 和 CO2 转化率分别达 75.5% 和 72.6%. C3H8 比 CH4 更易解离及被氧化, 部分 C3H8 解离出来的中间产物 CHx 物种可与吸附 H 结合为 CH4, 因而降低了 CH4 的表观转化率; CHx 也可与吸附的 CO2 物种反应生成 H2 与 CO, 从而促进了 CO2 的转化.

The small Ni particle size might be responsible for higher catalytic activity and stability of Ni/SiO2 catalyst because it promotes the dissociation of methane and propane and offers resistance to carbon deposition.Figure optionsDownload as PowerPoint slide