β-Mo2N0.78/γ-Al2O3催化剂的制备及其噻吩加氢脱硫活性的研究

以γ-Al2O3为载体，钼酸铵为氧化钼前驱体，采用在N2-H2气氛下的程序升温还原氮化反应，制备β-Mo2N0.78/γ-Al2O3催化剂，以噻吩为模型化合物，考察了该催化剂的加氢脱硫反应性能，以及反应温度、氢还原预处理和钴、镍助剂的引入等因素对催化剂活性的影响。结果表明，在320 ℃～400 ℃之间，随着反应温度的升高，催化剂的活性逐渐增加；预还原则降低了催化剂的活性；添加钴、镍均在一定负载量范围内可以改善β-Mo2N0.78/γ-Al2O3催化剂的加氢脱硫活性，但镍对催化剂活性的影响要小于钴。

STUDIES ON SYNTHESIS OF β-Mo2N0.78/γ-Al2O3 CATALYST AND ITS CATALYTIC BEHAVIOUR FOR THIOPHENE HYDRODESULFURIZATION(HDS)

γ-Alumina supportedβ-Mo2N0.78 catalysts were synthesized via temperature-program- med nitriding reaction of MoO3 using N2-H2 mixture gas. The precursor of active phases was prepared by impregnation of γ-Alumina with aqueous solution of ammonium heptamolybdate((NH4)6Mo7O24·4H2O), followed by drying and calcination in air. The hydrodesulfurization(HDS) reaction of thiophene over these catalysts was performed in a fixed-bed reactor at atmosphere pressure. The influence of HDS reaction temperature, pre-reduction of H2 and the addition of Co and Ni on the activity of β-Mo2N0.78/γ-Al2O3 were studied. The results show that the HDS activity increases with increasing reaction temperature from 320 ℃ to 400 ℃. Pre-reduction can deactivate the activity of catalyst. The addition of Co and Ni can improve the catalytic activity ofβ-Mo2N0.78/γ-Al2O3 catalyst.