摘要
在FeCl3/氯化丁基甲基咪唑离子液体中加入少量H+改性后,用于催化苯与乙烯的烷基化反应。结果表明,离子液体中加入H+改性后,乙烯的转化率由改性前的95.23%提高到100%,提高了4.77个百分点,乙苯的选择性由98.25%提高到99.42%。利用Raman光谱、FAB(快速原子轰击)和1HNMR分析手段,对改性离子液体改善催化烷基化效果的原因进行了研究。结果表明,改性后离子液体中阴离子Fe2Cl7-的强度下降,离子液体中加入H+后,形成超强酸,成为不同种类正碳离子的良好接受体,从而改善了H+传递反应的活性,使其具有较高的催化活性和选择性。
The alkylation of benzene with ethylene catalyzed by FeCl3/[bmim]Cl ionic liquid modified with proton （H^＋ ） was studied. The test results showed that after adding a small amount of H^＋ to FeCl3^- bmimCl ionic liquid the conversion of ethylene and the selectivity of ethylbenzene increased from 95.23% to 100%, and 98. 25% to 99.42%, respectively, The structure and anions of ionic liquid before and after adding H^＋ were investigated by Raman spectrum, FAB and ^1H NMR. The results showed that after adding H^＋ the concentration of Fe2 Cl7^- decreased; super-acid formed in the ionic liquid had the static charge field that stabilized the carbonium ions, and improved the activity of hydrogen transfer reaction, Thus, the ionic liquid modified with H^＋ exhibited improved catalytic activity and selectivity.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2005年第7期37-40,共4页
Petroleum Processing and Petrochemicals
基金
国家自然科学基金资助项目(No.20276038)
