负载型纳米ZrO2-Al2O3复合载体中ZrO2的负载量对Ni基催化剂性能的影响

采用真空浸渍法在负载型纳米ZrO2-Al2O3复合载体上负载NiO,并用X射线衍射考察了NiO在复合载体上的分散周值.结果表明,该分散阈值与ZrO2-Al2O3复合载体中ZrO2的负载量有关,当ZrO2的负载量为0.60 g/g时,NiO的分散阈值达到最高值0.315 g/g.热重-微分热重和程序升温脱附结果表明,NiO在不同ZrO2负载量的复合载体表面形成不同的相互作用和分布状态,复合载体中ZrO2的负载量影响催化剂表面活性中心的种类和对CO2的吸附.同时考察了不同ZrO2负载量的复合载体Ni基催化剂在CO2重整CH4反应中的活性和稳定性.

Effect of ZrO2 Content of the ZrO2-Al2O3 Composite Support on Catalytic Properties of the Ni-Based Catalyst

A vacuum impregnation method was used to support NiO on a supported nano ZrO2-Al2O3 composite support.Dispersion threshold of NiO on the composite support was studied using X-ray diffraction.The results indicated that the dispersion threshold was significantly related to the ZrO2 content in the ZrO2-Al2O3 composite support.When the ZrO2 content was 0.60 g/g,the dispersion threshold of NiO reached the highest value of 0.315 g/g.These results were further studied by thermogravimetry-derivative thermogravimetry and temperature-programmed desorption.NiO on the support with different ZrO2 contents showed different interaction with the support and different dispersion states forming different active centers.The activity and stability of the NiO/ZrO2-Al2O3 catalyst were studied in the CO2 reforming with CH4.