制备技术对加氢处理催化剂性能的影响

Influence of Preparation Techniques on the Structure and Activity of Hydrogenation Catalysts

以γ-Al2O3为载体,通过不同的制备技术制得3种加氢处理催化剂,考察了制备技术对催化剂的活性相结构与活性的影响;通过XPS,TEM,TPS等技术对催化剂进行表征。表征结果显示,通过引入有机助剂制备的催化剂FF-46的表面Ni原子含量明显高于其他两个催化剂,活性组分可充分硫化,含有更多的Mo4+,且使Ni的硫化发生延迟,更好地镶嵌在层状MoS2的边、角、棱位,MoS2片晶的层数较多,片长较短,从而产生更多的高活性中心。小型装置评价结果表明,采用该技术制得的催化剂FF-46活性明显好于其他技术制得的催化剂,且具有良好的活性稳定性。

Three hydrotreating catalysts were prepared by different techniques using γ-Al2O3 as the support and characterized by means of XPS,TPS and TEM.The results show that the Ni atom content on the surface of catalyst FF-46 prepared by the introduction of an organic promoter is obviously higher than those on the surfaces of the other two catalysts,the active components can completely be vulcanized,the catalyst contains more Mo4＋,and the Ni vulcanization is delayed,which leads to the Ni embedding in the edges of the MoS2 layers.The average layer number and length of the MoS2 lamellar crystals are larger and shorter,respectively.So more activity centers form on the surface of catalyst FF-46.By evaluation,the activity of catalyst FF-46 is significantly higher than those of the other catalysts and the catalyst has good stability.