以SiO_2为载体的磷化钼加氢脱硫催化剂研制

HYDRODESULFURIZATION OF SiO_2 SUPPORTED MoP CATALYST

以SiO2为载体,用钼酸铵和磷酸氢二铵作钼源和磷源,采用共浸渍法制备了氧化态前体,用氢气在固定床反应器上原位还原制备出了负载型磷化钼催化剂.在360℃、5.0 MPa和21h-1的反应条件下,考察了催化剂中MoP负载量、不同钼磷摩尔比对二苯并噻吩(DBT)加氢脱硫反应活性的影响.研究发现,MoP的负载量在8%～35%(质量分数)范围内,25%时活性最佳.n(Mo)/n(P)=1时的反应活性和n(Mo)/n(P)=1/2时相当,但远大于n(Mo)/n(P)=2时的反应活性.加入不同助剂Ni,Co,V后,未发现助剂组分和Mo之间存在协同作用.

Silica precursor and followed by supported MoP catalyst was prepared by co-impregnation to form an oxidized an in-situ reduction in the presence of hydrogen in a fixed bed reactor. The hydrodesulfurization （HDS） activity of the catalyst was measured in the same fixed bed reactor using 0.8% dibenzothiophene in decalin as model compound under the conditions of a reaction temperature of 360 ℃, a reaction pressure of 5.0 MPa and a WHSV of 21 h^-1. The loading of MoP, the ratios of Mo to P and the effects of co-catalyst components, such as Ni, Co and V, on catalyst performance were investigated. The test results showed that the optimum HDS activity was observed at a MoP loading of 25% within the loading range of 8%-35%; the catalytic activities of catalysts with Mo/P ratios of 1 and 1/2 were similar, but much higher than that of catalyst with Mo/P ratio of 2. Besides, no synergetic effect was observed among Mo atoms and the atoms of co-catalyst components.