碳酸二甲酯在固体碱上吸附和活化的原位红外光谱研究  

Study of Dimethyl Carbonate Adsorption and Activation on Solid Bases by Fourier Transform Infrared Spectroscopy

作　　者：吴功德[1] 王晓丽[1] 董庆年[2] 魏伟[2] 孙予罕[2] 倪珊[1] 周鑫鑫[1] 

机构地区：[1]南京工程学院环境工程系,南京211167 [2]中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原030001

出　　处：《分析化学》2010年第3期405-408,共4页Chinese Journal of Analytical Chemistry

基　　金：南京工程学院引进人才科研启动基金(Nos.KXJ08033;KXJ08034);南京工程学院大学生科技创新基金(No.N20081201)资助

摘　　要：采用原位红外技术研究了碳酸二甲酯在氧化镁、氟化镁、镁铝复合氧化物和氟改性的镁铝复合氧化物4种固体碱表面上的吸附和活化行为。结果表明:碳酸二甲酯以单、双齿两种形态吸附于固体碱的表面,双齿吸附的比单齿吸附的更易活化。碳酸二甲酯吸附于氧化镁和镁铝复合氧化物上活化生成甲氧基,吸附于氟化镁上活化生成甲氟基;而吸附于氟改性的镁铝复合氧化物上优先活化生成甲氟基,随着吸附表面温度的升高,逐渐有甲氧基生成,说明氟改性的镁铝复合氧化物是一种优良的甲基化反应催化剂。The adsorption and activation of dimethyl carbonate on the surface of solid base were investigated by in situ FTIR,and the solid bases included magnesia,magnesium fluoride,Mg-Al mixed oxide and fluorinemodified Mg-Al mixed oxide. The FTIR results showed that dimethyl carbonate adsorbed on the surface of solid based by two modes of bidentate and unidentate complex. The bidentate was more active than the unidentate. Methoxyl group was formed from the adsorbed dimethyl carbonate on the surface of magnesia and Mg-Al mixed oxide. And fluomethyl group was formed from the adsorbed dimethyl carbonate on the surface of sodium fluoride. However,dimethyl carbonate on the surface of fluorine-modified Mg-Al mixed oxide showed preference for generating fluomethyl group. With the increasing of the treating temperature of samples,the methoxyl group was gradually formed on the surface. Accordingly,the fluorine-modified Mg-Al mixed oxide was found to be an excellent catalyst for methylation.

关 键 词：固体碱 水滑石 氟 碳酸二甲酯 傅里叶变换红外光谱 

分 类 号：O647.3[理学—物理化学]