MoO3／γ-Al2O3催化剂中钼含量对草酸二甲酯与苯酚酯交换反应催化活性的影响

Effect of Mo content in MoO_3/γ-Al_2O_3 on the catalytic activity for transesterification of dimethyl oxalate with phenol

研究了使用催化剂MoO3/γ-Al2O3时钼含量对草酸二甲酯(DMO)与苯酚酯交换生成甲基苯基草酸酯(MPO)和草酸二苯酯(DPO)反应活性的影响。结果表明,钼含量为14%(质量分数)时,DPO达到最大收率6.1%,DMO达到最大转化率75.1%。并对MoO3/γ-Al2O3催化剂的组成、结构和相态采用比表面积测定、X射线衍射、吡啶吸附IR光谱分析、NH3-TPD测试等方法进行了表征。

The influence of molybdenum content on the catalytic performance in the transesterification of dimethyl oxalate （DMO） with phenol to methyl phenyl oxalate （MPO） and diphenyl oxalate （DPO） was investigated. The results indicated that the MoO3/γ-Al2O3 catalyst with 14% Mo content gave maximal DPO yield of 6.1% and 75.1% DMO conversion. The component, structure and phase of MoO3/γ-Al2O3 catalysts were characterized by means of X-ray diffraction （XRD）, BET specific surface area, temperature-programmed desorption of ammonia （NH3-TPD）, and FTIR analysis of adsorbed pyridine.