超增溶自组装法纳米Ni-Al_2O_3体相催化剂的合成及表征

Synthesize of Bulk Ni-Al_2O_3 Catalysts in the Way of Super-Solubilization Nanometer Self-Assembly and Its characterization

采用超增溶自组装法进行纳米Ni-Al2O3体相催化剂的制备。对所制备的Ni-Al2O3体相催化剂进行了XRD和压汞法表征。通过实验考察了尿素质量分数、表面活性剂质量分数、NiO质量分数等因素与Ni-Al2O3体相催化剂物化特性之间的关系。结果表明,尿素质量分数为(基准+5)%,表面活性剂质量分数为(基准+2)%,NiO质量分数为(基准+3)%时,Ni-Al2O3催化剂具有较好的孔结构。制备的体相催化剂的比表面积主要集中在186～324m2/g;孔径在3～12nm,属于中、大孔范围,孔径大小均匀、分布集中;孔容较大,在0.45～0.89mL/g,能够满足加氢催化剂的要求,是比较理想的纳米体相催化剂。该合成方法降低了表面活性剂和水的质量分数,操作工艺简单,反应易于控制,制得的纳米粒子比现有的渣油加氢催化剂性能优良,具有工业化生产应用价值。

Bulk Ni-Al2O3 catalysts was synthesized in the way of super-solubilization nanometer self-assembly. The bulk Ni- Al2O3 catalyst was characterized by X-ray diffraction （XRD） and the mercury porosimeter. The influence of affecting factors on physical properties of catalysts was investigated, such as the amount of urea and surfactant, and the amount of nikel oxide. The results show that bulk Ni-Al2O3 catalysts has a better bore structure, which is made from based amount plus 2 of surfactants, based amount plus 5 of urea and plus 3 of NiO. Specific area of the bulk Ni-Al2O3 catalyst is between 186 m2/g to 324 mr/g, bore diameter is 3- 12 nm, and the diameter of bore is even and distribute concentration, witch is belong to medium and big bore scope, the bore permits is 0.45-0.89 mL/g. This bulk catalyst is a more ideal bulk catalyst which can satisfy the request of hydrogenation. This synthesize method has more merits, such as decreasing the dosage of surfactant and aqueous, operation craft simple, reaction can be controlled easily. Nanometer bulk catalyst has a good application value in industrialize production because of its better property than the residue oil hydrogenation catalyst.