MCM-41负载的Ni 2P、MoP和WP加氢脱硫性能比较

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)的十氢蓁溶液为模型化合物,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.

Comparison of hydrodesulfurization performances of Ni 2P, MoP and WP supported by MCM-41

MCM-41-supported Ni 2P, 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 Ni 2P catalyst shows the highest HDS performance, exhibiting the highest HDS reaction rate constant and \%TOF\%, while WP/MCM-41 is the lowest. The HDS reaction routes over the three catalysts exhibit different trends towards different temperatures. The presence of H 2S in the feed significantly suppresses the hydrogenation pathway of Ni 2P/MCM-41, and leads to a drastic decrease in the HDS activity. MoP/MCM-41 exhibits better sulfur resistance compared with other catalysts.