载体对镍基催化剂及其甲苯水蒸气重整性能的影响

采用等体积浸渍法制备了MgO、HZSM-5、y-Al2O3、TiO2和SiO2负载的镍催化剂,考察了不同载体负载的镍基催化剂在甲苯水蒸汽重整反应中的活性和稳定性,并通过X射线衍射(XRD),程序升温还原(H2-TPR)以及程序升温脱附(NH3-TPD)等方法对催化剂的性质进行表征.结果表明,Ni/MgO催化剂中的镍镁固溶体和Ni/y-Al2O3催化剂中的镍铝尖晶石的形成有利于提高催化剂的活性,而载体的酸性容易导致催化剂积碳而不利于催化剂的稳定性.

Influence of Support on Catalytic Behavior of Ni-Based Catalysts in Steam Reforming of Toluene

A series of Ni-based catalysts were prepared by using incipient impregnation with different supports,such as MgO,HZSM-5,γ-Al2O3,TiO2and SiO2.Their catalytic performances were tested for steam reforming of toluene as a model compound of biomass-derived tar in a fluidized bed reactor,and their properties were characterized through X-ray diffraction(XRD),temperature programmed reduction(H2-TPR),temperature programmed desorption(NH3-TPD) etc.Combined with the characterization and activity results,it has been found that the formation of nickel magnesian solid solution in the Ni/MgO catalysts and nickel aluminum spinel in Ni/γ-Al2O3 catalysts are benefit to the improvement of the catalytic activity,but the acidity of support results in carbon deposition easily and militates against the improvement of the catalytic stability.