Ni2P加氢脱硫催化剂

环境法规对硫氧化物脱出的限制日益严格以及原油品质的不断下降,使得有必要研发高效的加氢脱硫催化剂。Ni2P由于具有优异的加氢脱硫活性和稳定性,引起了广泛的关注。本文综述了Ni2P加氢脱硫催化剂的特性、反应活性相、制备方法、改进和加氢脱硫活性等方面的研究进展。在Ni2P中存在两种不同的初始活性位,四面体几何构型的Ni(1)初始活性位在加氢脱硫反应中参与直接脱硫反应,四方锥几何构型的Ni(2)初始活性位则与催化剂的高加氢活性有关。在加氢脱硫反应中,催化剂表面生成的NixSyP相被认为是真正的活性相。制备Ni2P的方法主要是程序升温还原和液相合成。载体、助剂和络合剂对Ni2P活性相的形成和催化剂的活性有重要影响。相比于商用硫化物催化剂,Ni2P催化剂对噻吩、二苯并噻吩和4,6-二甲基二苯并噻吩均表现出更高的加氢脱硫活性。

Ni2P Catalyst for Hydrodesulfurization

More and more rigorous environmental regulations limiting the emissions of sulfur dioxide and the continuing decline in the quality of petroleum feedstocks have given rise to the need for investigation and development of high-performance hydrodesulfurization(HDS) catalysts.This paper provides a review of recent progress in the characteristics,active phase,synthesis,modification and HDS catalytic performance of Ni2P catalyst.There are two types of initial active sites in Ni2P.The Ni(1) initial active sites have a tetrahedral geometry,and which are involved in the direct desulfurization pathway in HDS.The Ni(2) initial active sites have a square pyramidal geometry,and which are responsible for the high catalytic activity in the hydrogenation pathway in HDS.A surface nickel phosphosulfide phase may be formed under HDS reaction,and which is considered as the real active phase.Ni2P is mainly prepared by temperature-programmed reduction and liquid phase synthesis.The support,promoter and complex agent have important effect on the formation of Ni2P active phase,as well as the catalytic activity.Compared with commercial sulfide catalyst,the Ni2P catalyst shows higher HDS activity for thiophene,dibenzothiophene and 4,6-dimethyldibenzothiophene.