甲烷临氧二氧化碳重整制合成气研究--流化床与固定床作用对比研究

采用碱土金属氧化物MgO和稀土金属氧化物CeO2修饰工业微球硅胶,并以此作载体负载镍活性组分.分别在流化床和固定床反应器中考察了该催化剂对甲烷临氧CO2重整制合成气反应的催化性能及稳定性.结果表明,MgO、CeO2修饰SiO2后有助于镍的分散,载体表面的酸性降低有助于减少积炭.两种反应器的反应结果对比表明,流化床内的催化剂颗粒始终处于氧化-还原循环之中,有助于消除催化剂床层热点和消除积炭,是适合甲烷临氧直接转化制合成气的反应器.

Study of autothermal reforming of CH4 with CO2 and O2 to produce syngas--Comparison of effect of fluidized bed and fixed bed reactor

Commercial available SiO_2 was modified by MgO and CeO_2 and was used as support to prepare nickel based catalyst. Catalytic performance and stability of Ni/MgO-CeO_2-SiO_2 were investigated for reforming of methane with CO_2 and O_2 to produce syngas, in fluidized bed and fixed bed reactor, respectively. Results showed that modification with MgO and CeO_2 was favor to disperse nickel species and suppress coke deposition. Catalyst particles were in a redox circle in the fluidized bed reactor. That is, hot spots and coke deposition were eliminated, and the fluidized bed reactor is a preferred reactor for convert methane to syngas in the present of O_2.