不同钼基催化剂抑焦效果的对比分析

Comparative Analysis of Coke Suppression Effect of Mo-Based Catalysts

采用自制的水溶性钼基催化剂和油溶性钼基催化剂原位分解制备了MoS2(标记为MoS2-1和MoS2-2),并对两类MoS2进行XRD分析、粒度分析和SEM形貌分析表征以及反应性能评价,以探讨在悬浮床加氢反应中的抑焦效果。高压釜评价结果表明,加入油溶性催化剂时的转化率和生焦量均优于加入水溶性催化剂。XRD分析结果表明,MoS2-1的结晶状态较差,MoS2-2的各特征峰尖锐,结晶状态良好,可以活化氢分子为活化氢,降低生焦率。SEM和粒度分析结果表明,MoS2-2的直径以1～5μm为主,MoS2-1直径以6～10μm为主,MoS2-2粒径较小,粒度分布比较均匀,可提供更多的加氢活性中心提高反应的转化率。

MoS2(labeled as MoS2-1 and MoS2-2) was prepared by in-situ decomposition of water-soluble molybdenum-based catalyst and oil-soluble molybdenum-based catalyst.In order to explore the effect of two types of molybdenum catalyst in slurry-bed hydrocracking and preliminary theoretical analysis,the catalysts were characterized by XRD analysis,particle size analysis,SEM analysis and evaluation of reaction performance.Autoclave evaluation results showed that,compared with adding oil-soluble catalysts,the transformation rate and coke yield rate were better than that by adding water-soluble catalyst.The results of XRD analysis showed that the crystalline state of MoS2-1 was poor.The characteristic peaks of MoS2-2 were sharp and the crystalline state was good,so the hydrogen could be activated to activate hydrogen and the coke yield rate was reduced.The results of SEM analysis and particle size analysis showed that the MoS2-2 was smaller and the diameter was mainly 1~5μm.MoS2-1 was larger and the diameter was mainly 6~10μm.MoS2-2 catalyst had smaller particle size and uniform particle size distribution which could provide more hydrogenation active centers to improve the conversion rate of the reaction.