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	氯铝酸离子液体的酸性及其催化烷基化反应研究
	吴芹 ; 董斌琦 ; 韩明汉 ; 辛洪良 ; 左宜赞 ; 金涌 ; WU Qin ; DONG Bin-qi ; HAN Ming-han ; XIN Hong-liang ; ZUO Yi-zan ; JIN Yong
	2010-06-10 ; 2010-06-10
关键词	氯铝酸离子液体 红外光谱法 酸性 吡啶 乙腈 烷基化反应 Chloroaluminate ionic liquids IR spectroscopy Acidity Pyridine Acetonitrile Alkylation O643.32
其他题名	Studies on Acidity of Chloroaluminate Ionic Liquids and Its Catalytic Performance for Alkylation of Benzene with Long-Chain Alkenes
中文摘要	分别采用吡啶探针和乙腈探针红外光谱法研究了氯铝酸离子液体的酸性,结合固体酸表征方法,研究了离子液体的酸性对吡啶探针各振动模式的影响。发现当氯铝酸离子液体AlCl3的摩尔分数x为0.4~0.5时,离子液体显弱Lewis酸性,强碱性吡啶探针分子能很好地表征离子液体的酸性,而弱碱性乙腈探针分子只适用于表征酸性较强的离子液体。考察了氯铝酸离子液体酸强度对苯与长链烯烃烷基化反应的影响,结果发现,AlCl3的摩尔分数x≤0.5时,离子液体没有催化活性;x>0.55时,随着离子液体酸性的增强,烯烃转化率升高,但2位烷基苯选择性下降。结合离子液体的酸强度对烷基化反应机理进行初步分析认为具有催化活性的物质是强Lewis酸Al2Cl7-。; The acidity of chloroaluminate ionic liquids(ILs) was determined by using pyridine and acetonitrile as IR spectroscopic probes.Based on the characterization method of acidity of solid acid,IR νCCN absorption frequencies of pyridine in ionic liquids were assigned.By using the pyridine probe,it was found that when the anion molar composition x of ionic liquid varies within 0.4-0.5,ionic liquids exhibit weak Lewis acidity.Strongly basic molecular pyridine can be used as a probe to measure the acidity of ionic liquids whether their acidity is strong or weak,while weakly basic molecular acetonitrile is only fit for strong acid.In addition,the Lewis acidity-activity correlation for the chloroaluminate ionic liquids catalyst in the alkylation reaction was studied.The weakly acidic ILs with x≤ 0.5 does not exhibit any catalytic activity in the alkylation reaction.When the anion molar composition x is more than 0.55,the activity of ionic liquids is greatly enhanced due to the increase in the strength of the strong Lewis acidic species Al2Cl-7.But with the increase in alkenes conversion,the selectivity of 2-alkylbenzene is slightly reduced.; 国家自然科学基金重点项目(20436050)资助
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/64519]
专题	清华大学
推荐引用方式 GB/T 7714	吴芹,董斌琦,韩明汉,等. 氯铝酸离子液体的酸性及其催化烷基化反应研究[J],2010, 2010.
APA	吴芹.,董斌琦.,韩明汉.,辛洪良.,左宜赞.,...&JIN Yong.(2010).氯铝酸离子液体的酸性及其催化烷基化反应研究..
MLA	吴芹,et al."氯铝酸离子液体的酸性及其催化烷基化反应研究".(2010).

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