通过溶剂热法制备不同Si掺杂量的Si-TiO₂载体，采用等体积浸渍法制得Si-TiO₂/-V₂O₅催化剂，利用XRD、H₂-TPR、NH₃-TPD、UV-Vis对催化剂的性质进行表征，研究了Si掺杂改性对催化剂钒氧物种分散性和氧化还原性、催化剂表面酸性以及反应性能的影响。结果表明，硅掺杂改性后改善了催化剂表面钒氧物种的分散性，提高了催化剂的氧化还原能力，使催化剂具有更加适宜的酸性，提升了甲醇氧化制二甲氧基甲烷（DMM）的反应性能。Si掺杂量为3%的3Si-TiO₂/V₂O₅催化剂表现出良好的反应性能，此时甲醇转化率为58.5%，DMM的选择性高达99.1%。

Silicon doped TiO₂ is prepared through solvothermal treatment with tetraethyl orthosilicate and butyl titanate in acetic acid solution,and Si-TiO₂/-V₂O₅ catalysts are obtained by incipient impregnation with ammonium metavanadate solution.V₂O₅/Ce-TiO₂ catalysts are characterized by XRD,UV-Vis,H₂-TPR and NH₃-TPD.It is shown that the dispersion of vanadium species is improved on the surface of Si modified TiO₂.Si modification enhances the redox properties of catalysts and makes the acidity of the catalyst more suitable for the reaction of methanol to dimethoxymethane.With a silicon doping ratio of 3%,3Si-TiO₂/V₂O₅ shows a good reactive performance,over which methanol conversion and DMM selectivity reaches 58.5% and 99.1%,respectively.

谢锦印(1994-),男,硕士研究生,研究方向为多相催化,xiejinyin@163.com