氧化钛晶须改性对Ni-Mo/γAl_2O_3催化剂加氢脱硫性能的影响

EFFECT OF TITANIA WHISKER MODIFICATION ON HYDRODESULFURIZATION OF Ni-Mo/γAl_2O_3 CATALYST

将纯锐钛矿晶型的TiO2晶须材料引入Al2O3中,可提高Ni-Mo/γ-Al2O3催化剂的加氢脱硫活性,Raman光谱和H2-TPR表征发现,TiO2晶须材料可以减弱Al2O3与活性组分间的相互作用,有利于活性金属Mo形成具有高活性的八面体Mo物种,进而提高催化剂活性。当TiO2晶须含量超过一定范围后,由于比表面积下降对催化剂活性的抑制作用更加显著,导致催化剂活性下降。

Bring titania whisker with pure anatase crystal structure into alumina,the hydrodesulfurization activity of Ni-Mo/γ-Al2O3 catalyst can be increased.The characterizations of Raman spectrum and H2-TPR indicate that titania whisker can weak the interaction between alumina and active components,which favors the active metal molybdenum to form octahedral species,resulting in higher activity of the catalyst.When the content of titania whisker is beyond a certain rang,the catalyst activity is decreased due to the significant reduction of specific surface area.