论文部分内容阅读
运用固定床流动反应装置、TPR和XRD等手段考察了载体的晶相组成、比表面和孔结构等性质对Ni基催化剂在甲烷部分氧化制合成气中反应性能的影响。结果表明,热稳定性好、导热好的惰性材料如(Ca)MgAl2O4等是甲烷部分氧化制合成气理想的催化剂载体。载体必须具有适当的比表面和孔结构,以利于反应物分子在催化剂表面吸附并与活性中心充分接触,同时也有利于产物分子脱附并离开催化剂表面,防止副反应(积碳反应和燃烧反应)的发生,及时把反应热移走,避免热点产生使催化剂失活。另外还发现,具有不同比表面和孔结构的催化剂具有不同的最佳空速
The effect of Ni-based catalysts on the catalytic performance of partial oxidation of methane to syngas was investigated by means of fixed-bed flow reactor, TPR and XRD. The results show that an inert material such as (Ca) MgAl2O4 with good thermal stability and good thermal conductivity is an ideal catalyst carrier for the partial oxidation of methane to syngas. The carrier must have suitable specific surface and pore structure to facilitate adsorption of reactant molecules on the surface of the catalyst and full contact with the active site. It also facilitates desorption of the product molecules from the surface of the catalyst to prevent side reactions (carbon deposition and combustion reactions ) Occurs, the reaction heat removed in time to avoid the hot spots to deactivate the catalyst. It has also been found that catalysts with different specific surface and pore structures have different optimum space velocities