含镍WP/MCM-41催化剂二苯并噻吩加氢脱硫性能

以MCM-41为载体，以镍（Ni）为助剂，制备了Ni含量不同的WP/MCM-41催化剂。采用XRD、BET、SEM和XPS对催化剂进行了表征；以二苯并噻吩（DBT）为模型化合物，通过高压微反装置考察催化剂的加氢脱硫（HDS）活性。结果表明，Ni的加入促进了活性组分WP的生长并使其晶相尺寸略有增加，一定含量的Ni有利于提高催化剂的比表面积。Ni对WP/MCM-41催化剂二苯并噻吩HDS反应具有促进作用。少量Ni的加入有利于WP活性相的生成并增加了活性位的数量；加入过量的Ni，在催化剂中形成了具有一定活性的类似Ni-W-P结构的物种，减少了活性组分WP所占的比例，从而使催化剂DBT的 HDS活性降低。其中，Ni的质量分数为1%的催化剂（cat-Ni-1）具有相对较高活性，其DBT 脱硫率和转化率分别为76.78%和72.16%，比不加Ni的催化剂分别提高了30.04%和21.62%。二苯并噻吩在WP/MCM-41催化剂上以加氢脱硫途径为主，Ni的加入对提高加氢脱硫途径选择性起到了促进作用，且加氢脱硫选择性随Ni含量的增加而提高。

Performance of dibenzothiophene hydrodesulfurization for WP/MCM-41 catalyst containing promoter nickel

The supported tungsten phosphide catalysts with different content of nickle were prepared over MCM-41.The samples were characterized by X-ray diffraction(XRD),BET specific surface area,scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS) methods.The dibenzothiophene(DBT) hydrodesulfurization(HDS) performance of catalysts was evaluated in a fixde-bed reactor at 633 K,3 MPa H2 and with a space velocity of 4 h-1.The results showed that the addition of Ni promoted the growth of active spe...