MCM-41负载的Ni_2P、MoP和WP加氢脱硫性能比较

Comparison of hydrodesulfurization performances of Ni_2P,MoP and WP supported by MCM-41

通过原位程序升温还原方法制备了以MCM-41负载的Ni2P、MoP和WP催化剂,并用XRD和CO化学吸附对催化剂进行了表征.以质量分数0.8%的二苯并噻吩(DBT)的十氢萘溶液为模型化合物,考察了3种磷化物催化剂的加氢脱硫(HDS)反应性能.结果表明,Ni2P/MCM-41催化剂在DBT的HDS反应中表现出最佳的反应性能,具有最高的反应速率常数和TOF,而WP/MCM-41最低.DBT在3种磷化物催化剂上的HDS反应路径随温度的变化表现出不同的趋势.H2S的存在显著抑制了Ni2P/MCM-41催化剂加氢路径,从而强烈抑制了其HDS反应活性.MoP/MCM-41表现出相对较好的耐硫性能.

MCM-41-supported Ni2P,MoP and WP catalysts were prepared by an in-situ temperature programmed reduction method from their oxide precursors and characterized by XRD and CO chemisorption.The hydrodesulfurization（HDS）performances of the three catalysts were evaluated using a model fuel containing 0.8% dibenzothionphene（DBT）in decalin.The results indicate that MCM-41-supported Ni2P catalyst shows the highest HDS performance,exhibiting the highest HDS reaction rate constant and TOF,while WP/MCM-41is the lowest.The HDS reaction routes over the three catalysts exhibit different trends towards different temperatures.The presence of H2S in the feed significantly suppresses the hydrogenation pathway of Ni2P/MCM-41,and leads to a drastic decrease in the HDS activity.MoP/MCM-41exhibits better sulfur resistance compared with other catalysts.