V/Mo-HMS催化苯甲醇氧化制苯甲醛
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0643

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Oxidation of benzyl alcohol to Benzaldehyde Catalyzed by V/Mo-HMS
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    摘要:

    以偏钒酸铵、磷钼酸为活性组分,采用溶胶-凝胶法原位合成钒、钼改性HMS介孔材料(V/Mo-HMS)。通过X射线衍射光谱(XRD)、扫描电镜(SEM)、N2吸附-脱附(BET)、H2程序升温还原(H2-TPR)、X射线光电子能谱(XPS)及热分析(TG-DTA)等手段对合成的V/Mo-HMS进行表征。同时以30%双氧水为氧化剂,V/Mo-HMS为催化剂,催化苯甲醇氧化制苯甲醛,讨论了不同金属改性HMS对催化反应的影响。结果表明,与HMS比较,V/Mo-HMS的比表面积、孔容及平均孔径均降低;0.1mol苯甲醇用0.8 mol 30% H2O2氧化,乙酸乙酯为溶剂,催化剂用量0.07 g,在90℃下反应6h,苯甲醇的转化率可达68.16%,苯甲醛的选择性达到89.02%。催化剂可回收重复使用。

    Abstract:

    ammonium metavanadate, phosphomolybdic acid as active component were used to HMS mesoporous materials by sol-gel method to obtain V/Mo-HMS catalysts, and the modified catalysts were characterized by X-ray differential(XRD), scanning electron microscopy(SEM), N2 adsorption- desorption(BET), H2 temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), thermal analysis(TG-DTA). The catalytic performance the V/Mo-HMS was investigated in the oxidation of benzyl alcohol to benzaldehyde using aqueous hydrogen peroxide(mass fraction 30% H2O2) as oxidant and the effect of HMS modified by various matal on catalytic oxidation reaction was tested. The results indicated that the specific surface area, pore volume and mean pore size of V/Mo-HMS were decreased Compared with HMS. The catalytic activity of V/Mo-HMS was better than the HMS modified by other matals. Conversion rate of benzyl alcohol reached 68.16 % with the selectivity of 89.02% to benzaldehyde when benzyl alcohol was 0.1mol, 30% H2O2 was 0.8 mol, catalyst amount was 0.07 g at 90 ℃ for 6h and ethyl acetate as solvent. The catalyst can be recycled and reused.

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陈平. V/Mo-HMS催化苯甲醇氧化制苯甲醛[J].精细化工,2017,34(2):

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  • 收稿日期:2016-04-07
  • 最后修改日期:2016-09-06
  • 录用日期:2016-11-03
  • 在线发布日期: 2017-02-09
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