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采用Na_2CO_3溶液分别处理二氧化硅∶三氧化二铝物质的量比为50∶1、80∶1、150∶1的ZSM-5分子筛,采用XRD、SEM和NH3-TPD等进行表征。结果表明,经Na2CO3处理后,形成了微孔-介孔多级孔ZSM-5分子筛。在多级孔分子筛上负载Co、Mo制备Co-Mo/ZSM-5催化剂并进行加氢脱硫反应;研究了工艺条件对最佳催化剂加氢脱硫性能的影响。结果表明,二氧化硅∶三氧化二铝物质的量比为50∶1的催化剂加氢脱硫率最高;该催化剂在反应温度为350℃,压力3.0MPa,空速2.0h-1时,脱硫率达90.8%。
The ZSM-5 molecular sieves with the mass ratio of silica to alumina of 50:1, 80:1 and 150:1 were respectively treated with Na_2CO_3 solution and characterized by XRD, SEM and NH3-TPD. The results showed that after Na2CO3 treatment, a microporous-mesoporous multi-stage pore ZSM-5 molecular sieve was formed. The Co-Mo / ZSM-5 catalyst was loaded on multi-stage molecular sieve to prepare Co-Mo / ZSM-5 catalyst for hydrodesulfurization. The effect of process conditions on the optimal catalyst hydrodesulfurization performance was studied. The results showed that the ratio of silica to alumina was the highest, the ratio of hydrodesulfurization was 50: 1. When the reaction temperature was 350 ℃, the pressure was 3.0 MPa and the space velocity was 2.0 h-1, the desulfurization rate Up to 90.8%.