以四硫代钼酸铵为前躯体制备的MoS2和Ni-Mo-S催化剂加氢脱硫反应性能研究

摘要

Molybdenum disulfide was prepared from ammonium tetrathiomolybdate as a precursor.Ni-Mo-S catalyst was also synthesized from ammonium tetrathiomolybdate with nickel as a promoter.The hydrodesulfurization (HDS)performance of these two catalysts were studied using a model fuel of decalin solution containing 0.8%DBT with and without quinoline in it.The results indicate that the in-troduction of nickel increases the HDS activity of molybdenum disulfide.The existence of quinoline re-strains the HDS activities of these two catalysts.Both the activities of the hydrogenation pathway (HYD)and direct desulfurization (DDS)are suppressed for the molybdenum disulfide catalyst in case of the presence of quinoline.When quinoline exists,the DDS activity is enhanced on Ni-Mo-S catalyst and the HYD activity is just the other way.The inhibiting effect on HYD activity for Ni-Mo-S catalyst is significantly weaker than molybdenum disulfide,indicating that the introduction of nickel increases the nitrogen resistance of molybdenum disulfide.%以四硫代钼酸铵为前躯体制备二硫化钼（MoS2）催化剂，并引入Ni 金属作为助剂合成Ni-Mo-S催化剂，以二苯并噻吩质量分数为0•8％的十氢萘溶液为模型化合物，考察了这两种催化剂的加氢脱硫性能，同时考察喹啉的存在对于这两种催化剂加氢脱硫反应性能的影响。结果表明：Ni 助剂的引入增强了催化剂的加氢脱硫反应活性；喹啉的存在抑制了加氢脱硫反应活性，在 Mo S 2催化剂上，喹啉的存在同时抑制了催化剂的预加氢脱硫和直接脱硫两条路径的活性，而在N i-Mo-S催化剂上，喹啉只抑制了预加氢脱硫路径的活性，而直接脱硫路径的活性反而得到提高；喹啉的存在对于Ni-Mo-S催化剂活性的抑制作用明显小于 MoS2，说明Ni 助剂的引入有效地提高了硫化钼催化剂的耐氮性能。