多孔PMoAl胶体球的原位制备及加氢性能研究

In-situ Preparation of Porous PMoAl Colloidal Spheres and Their Catalytic Performance of Hydrogenation

采用原位合成方法,制备了一系列具有核壳结构的PMoAl多孔胶体球。通过X-射线衍射(XRD)、透射电镜(TEM)、H2-程序升温还原(H2-TPR)和N2吸附脱附对所制备的材料进行表征。选用二苯并噻吩(DBT)和萘作为模型化合物,研究催化剂结构与活性的关系。结果表明,采用原位制备方法,可以使得Mo物种较为均匀地分散在多孔胶体球上。通过调节反应体系中磷钼酸的添加量,能够有效地调控胶体球的孔结构参数。通过研究催化活性发现,催化剂的孔隙结构对催化活性具有较大的影响。以NiPMoAl(SP)-0.20作为催化剂,反应温度为340℃,二苯并噻吩的转化率可达99.87%,萘的转化率可达81.28%。

A series of PMoAl porous colloidal spheres with core-shell structure were successful in-situ synthesized and characterized using X-ray diffraction(XRD),transmission electron microscopy(TEM),H2-programmed temperature reduction(H2-TPR),and N2 adsorption and desorption.The catalysts were evaluated in the reaction of simultaneously hydrodesulfurization(HDS)of dibenzothiophene(DBT)and hydrogenation of naphthalene.The obtained results showed that the Mo species were uniformly dispersed on the porous colloidal spheres.Meanwhile,the pore structure of the colloidal spheres can be effectively adjusted by controlling the addition of phosphomolybdic acid.In addition,the pore structure of the catalyst was also crucial to the performance of catalyst in the reaction of simultaneously hydrodesulfurization(HDS)of dibenzothiophene(DBT)and hydrogenation of naphthalene.As a result,the NiPMoAl(SP)-0.20 catalyst displayed promising catalytic activities for the reaction of HDS with both DBT conversion of 99.87%and naphthalene conversion of 81.28%at 340℃.