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用异丙氧基钛溶液浸渍法将一定量TiO_2覆盖在Al_2O_3表面上,制成TiO_2-Al_2O_3二元氧化物载体,然后担载上不同含量的MoO_3;运用LRS,XRD,XPS和TPR等方法考察了MoO_3的分散状态和还原行为。结果表明,TiO_2O_3表面的覆盖可削弱MoO_3与载体Al_2O_3的相互作用,抑制Al_2(MoO_4)_3的生成和增加表面上Mo原子浓度。TiO_2对Al_2O_3的调变还有利于MoO_3还原成低价Mo(Ⅳ),从而提高催化剂的加氢脱硫初活性。
A certain amount of TiO 2 was coated on the surface of Al 2 O 3 by impregnation with titanium isopropoxide to make TiO 2 -Al 2 O 3 binary oxide support, and then loaded with different content of MoO 3. The results of LRS, XRD, XPS and TPR MoO 3 dispersion and reduction behavior. The results show that the coating of TiO 2 O 3 can weaken the interaction between MoO 3 and Al 2 O 3, restrain the formation of Al 2 (MoO 4) 3 and increase the concentration of Mo on the surface. The modulation of TiO 2 to Al 2 O 3 also favors the reduction of MoO 3 to Mo (Ⅳ), which improves the initial hydrodesulfurization activity of the catalyst.