负载顺序对CoMoP/Al_(2)O_(3)-TiO_(2)催化剂汽油脱硫性能的影响

Effect of Loading Sequence on Gasoline Desulfurization Performance of CoMoP/Al_(2)O_(3)-TiO_(2)

改变Ti、P、Mo、Co的负载顺序,采用分步浸渍法制备了CoMoP/TiO_(2)-Al_(2)O_(3)。结合XRD、N2吸附-脱附和H2-TPR表征技术,考察负载顺序对催化剂的金属分散状态、孔结构、还原性及模型汽油的选择性加氢脱硫性能的影响。结果表明,与依次负载Ti、Mo、Co、P所得TMCP催化剂及依次负载P、Ti、Mo、Co所得PTMC催化剂相比,依次负载Ti、P、Mo、Co所得TPMC催化剂的Mo分散度较高,具有较大的孔容和平均孔径,较强的金属还原性,较弱的Mo-Al_(2)O_(3)相互作用,在模型汽油脱硫反应中表现出较高的脱硫活性及选择性。

By changing the sequence of loading Ti,P,Mo,and Co,CoMoP/TiO_(2)-Al_(2)O_(3)is prepared by a step-wise impregnation method.Combining XRD,N2 adsorption-desorption and H2-TPR characterization techniques,the effects of loading sequence on the metal dispersion state,pore structure,reducibility and model gasoline selective hydrodesulfurization performance of catalysts are investigated.The results show that compared to TMCP catalyst(loaded with Ti,Mo,Co,and P respectively)and PTMC catalyst(loaded with P,Ti,Mo and Co respectively),TPMC catalyst(loaded with Ti,P,Mo and Co respectively)has higher Mo dispersion,larger pore volume and average pore size,higher metal reducibility,weaker Mo-Al_(2)O_(3)interaction,and exhibits superior desulfurization activity and selectivity in the desulfurization reaction of model gasoline.