黏结剂对Ni-Mo-W体相加氢精制催化剂性能的影响

Influence of Binders on the Properties and Performance of Ni-Mo-W Bulk Hydrytreating Catalysts

Ni-Mo-W体相催化剂具有很高的加氢脱硫、加氢脱氮和芳烃饱和活性,但是成本过高,堆密度过大,强度较差,导致其应用受到限制。在Ni-Mo-W体相催化剂的制备过程中加入黏结剂,采用XRD、TEM、XPS及中型活性评价手段,考察了黏结剂的种类、加入量和加入方式对催化剂性质和活性的影响。结果表明,在Ni-Mo-W体相催化剂中加入质量分数20%的氧化铝后,可降低催化剂的生产成本和堆密度,提高催化剂的强度,改善催化剂的孔结构性质;含有适量黏结剂的Ni-Mo-W体相催化剂上活性组分的硫化程度较高,分散良好,活性中心密度很高,活性结构层数较高,使催化剂上活性中心数目大幅度提高。含有适量黏结剂的Ni-Mo-W体相催化剂具有优异的加氢性能,其加氢脱硫活性是负载型参比剂的1.46～6.49倍。

The Ni-Mo-W bulk catalyst has very high hydrodesulfurization（HDS）,hydrodenitrogenation（HDN） and hydrodearomatization（HDA） activities,while its application is restricted due to its high cost,high density and poor strength.The Ni-Mo-W bulk catalysts with the addition of binder were prepared.The influence of the type,the content and the adding method of the binder on the properties and hydrotreating performance of the catalyst was investigated by XRD,TEM and XPS and pilot plant test.The results showed that the Ni-Mo-W bulk catalyst with mass fraction of 20% alumina binder had higher strength and better textual structure but lower density and lower manufacturing cost compared with the Ni-Mo-W bulk catalyst without alumina binder,and also had high sulfidation degree of surface species,highly dispersed active component,dense active phase and considerable more active sites,so it exhibited higher HDS activity,which was 1.46-6.49 times of that of traditional supported one.