| 余晓鹏,张付宝.溶胶-凝胶法制备MoO3/SiO2催化草酸二甲酯和苯酚酯交换反应[J].分子催化,2018,32(4):334-341 |
| 溶胶-凝胶法制备MoO3/SiO2催化草酸二甲酯和苯酚酯交换反应 |
| Transesterification of Dimethyl Oxalate with Phenol over MoO3/SiO2 Catalysts Prepared by Sol-Gel Method |
| 投稿时间：2018-06-06 修订日期：2018-07-19 |
| DOI： |
| 中文关键词: 溶胶-凝胶法 MoO3/SiO2催化剂 甲基苯基草酸酯 草酸二苯酯 酯交换 |
| 英文关键词:sol-gel method MoO3/SiO2 catalyst methyl phenyl oxalate diphenyl oxalate transesterification |
| 基金项目:四川理工学院人才引进项目（2013RC04） |
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| 中文摘要: |
| 采用溶胶-凝胶法在碱性条件下制备了一系列MoO3/SiO2催化剂用于草酸二甲酯和苯酚酯交换反应，并利用XRD、IR、XPS、NH3-TPD等表征催化剂结构.结果表明：弱酸中心是草酸二甲酯和苯酚酯交换反应的活性中心.当MoO3负载量为12%（重量百分比），pH为9.1时的MoO3/SiO2催化剂具有更高的催化性能，这可能与该催化剂表面Mo物种分散更好和更高的酸量有关.在1.20 g MoO3/SiO2催化剂，0.20 mol苯酚，n（草酸二甲酯）/n（苯酚）=2，180℃反应3 h的条件下，苯酚转化率达70.0%，甲基苯基草酸酯和草酸二苯酯选择性分别为88.4%和11.5%. |
| 英文摘要: |
| A series of MoO3/SiO2 catalysts for the transesterification of dimethyl oxalate (DMO) with phenol were prepared by sol-gel method under alkaline conditions, and their structures were characterized by XRD, FT-IR, XPS and NH3-TPD. The results indicated that weak Lewis acid sites were occurred. When the loading of MoO3 is 12%, the MoO3/SiO2 catalyst prepared at pH=9.1 exhibited higher catalytic performance, which might be attributed to the higher dispersion of Mo species and the higher surface acid amounts. Under optimal transesterification reaction conditions (m (catalyst)=1.20 g, 0.20 mol Phenol,n(DMO)/n(Phenol)=2, T=180℃, t=3 h), the conversion of phenol reached 70.0%, and the selectivities to methyl phenyl oxalate (MPO) and diphenyl oxalate (DPO) were 88.4% and 11.5%, respectively. |
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