单质硫预硫化加氢催化剂的研究进展

A review on hydrogenation catalysts for presulfurization of elemental sulfur

加氢脱硫是脱除有机硫的重要技术,预硫化是将加氢催化剂由氧化态转化为活性硫化态的工艺,是对加氢催化剂的关键处理过程。单质硫作为预硫化剂具有无毒、硫化效率高等优势。为此总结了单质硫预硫化加氢催化剂相关的研究进展,以期为单质硫预硫化工艺的发展和应用提供参考。首先介绍了单质硫硫化加氢催化剂的硫化机理,分析了预硫化过程的影响因素,包括单质硫引入量、硫化温度、硫化压力、硫化时间;其次单质硫作预硫化剂相比其他硫化剂具有优势,但在预硫化过程中存在易升华的问题,针对此问题详细介绍了不同引入方式对单质硫在催化剂中保留度的影响;随后概述了采用单质硫预硫化加氢催化剂的国内外工业应用情况;最后进行了概括总结并对未来单质硫预硫化加氢催化剂的研究方向进行了展望。提出通过研究单质硫与金属氧化物的相互作用与作用机理,且以获得活性硫化物为目标进一步提高硫化度,是提高单质硫预硫化效果及后续催化加氢活性性能的关键。

Hydrodesulfurization is an important technology for organic sulfur removal.Presulfurization is the process of converting the hydrogenation catalyst from the oxidation state to the active sulfurized state,which is a key treatment process for the hydrogenation catalyst.Elemental sulfur as a presulfiding agent is attracting extensive attention of researchers in recent years due to its advantages of non-toxicity and high sulfurization efficiency.This review summarizes the progress of research on elemental sulfur presulfurization catalysts,in order to provide reference for the development and application of hydrogenation catalyst presulfurization process.Firstly,the presulfurization mechanism of elemental sulfur sulfide hydrogenation catalysts was introduced,and the influencing factors of the presulfurization process were analyzed,including the amount of elemental sulfur introduced,presulfurization temperature,pressure,and time.Secondly,elemental sulfur as a presulfiding agent has advantages compared with other presulfiding agents,but there is a problem of easy sublimation during the presulfurization process.In response to this issue,a detailed introduction was provided on the impact of different introduction methods on the retention of elemental sulfur in catalysts.Subsequently,an overview was provided of the industrial applications of sulfur presulfurization hydrogenation catalysts both domestically and internationally.Finally,a summary was made and the future research direction of elemental sulfur presulfidation hydrogenation catalysts was prospected.It was proposed to further improve the sulfidation by studying the interaction and mechanism of elemental sulfur and metal oxides with the goal of obtaining active sulfides.This is the key to improving the presulfurization effect of elemental sulfur and subsequent catalytic hydrogenation activity performance.