| Cr2O3/SiO2催化苯酚与碳酸二乙酯邻位烷基化反应 |
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| 引用本文： | 贾泉,薛冰,许杰,李永昕. Cr2O3/SiO2催化苯酚与碳酸二乙酯邻位烷基化反应[J]. 化工进展, 2011, 30(5): 1019-1023 |
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| 作者姓名： | 贾泉 薛冰 许杰 李永昕 |
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| 作者单位： | 常州大学石油化工学院，江苏 常州 213164 |
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| 基金项目： | 江苏省高技术研究项目，江苏省"青蓝工程"青年骨干教师项目 |
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| 摘 要： | 以Cr(NO3)3?9H2O为前体，采用等体积浸渍法制备了一系列不同Cr2O3负载量的Cr2O3/SiO2催化剂；在固定床连续微反装置上，考察了Cr2O3/SiO2催化剂对苯酚与碳酸二乙酯邻位烷基化反应的催化性能；采用XRD、NH3-TPD、CO2-TPD和吡啶吸附、红外等手段对催化剂进行了表征。实验结果表明，随着Cr2O3负载量的增加，苯酚的转化率和邻乙基苯酚的选择性均逐渐增加；当Cr2O3负载量达到7.5%时，苯酚的转化率和邻乙基苯酚的选择性均达到最大值，分别为48%和67%。催化剂的表征结果表明，L酸中心是苯酚邻位烷基化反应的活性中心，苯酚转化率和邻乙基苯酚选择性的变化主要是由催化剂的酸、碱中心数目变化引起的。
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| 关 键 词： | 氧化铬 二氧化硅 碳酸二乙酯 苯酚 邻乙基苯酚 2,6-二乙基苯酚 |
Ortho-selective alkylation of phenol with diethyl carbonate over Cr2O3/SiO2 catalyst |
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| JIA Quan,XUE Bing,XU Jie,LI Yongxin. Ortho-selective alkylation of phenol with diethyl carbonate over Cr2O3/SiO2 catalyst[J]. Chemical Industry and Engineering Progress, 2011, 30(5): 1019-1023 |
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| Authors: | JIA Quan XUE Bing XU Jie LI Yongxin |
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| Affiliation: | School of Petrochemical Technology，Changzhou University，Changzhou 213164，Jiangsu，China |
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| Abstract: | Cr2O3/SiO2 catalysts with different Cr2O3 loadings were prepared by impregnation with Cr(NO3)3?9H2O as precursor．Ortho-selective alkylation of phenol with diethyl carbonate was performed in a continuous flow fixed-bed reactor filled with Cr2O3/SiO2 catalysts．The Cr2O3/SiO2 catalysts were characterized by means of XRD，NH3-TPD，CO2-TPD and FT-IR with pyridine adsorption．The results indicated that with increasing Cr2O3 loading，conversion of phenol and selectivity to o-ethylphenol increased；when Cr2O3 loading reached 7.5%，conversion of phenol and selectivity for o-ethylphenol reached a maximum of 48% and 67%，respectively．The catalyst characterization results showed that the Lewis acid sites were the active centers of ortho-selective alkylation of phenol；and the variations in phenol conversion and selectivity to o-ethylphenol could be mainly ascribed to the change in the number of acid sites and base sites． |
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