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疏水双功能介孔固体酸的合成及其在乙酸乙酯酯化反应中的应用
引用本文:薛海霞,李军平,许振芹,王峰,赵宁,肖福魁,魏伟,孙予罕.疏水双功能介孔固体酸的合成及其在乙酸乙酯酯化反应中的应用[J].燃料化学学报,2009,37(6):747-751.
作者姓名:薛海霞  李军平  许振芹  王峰  赵宁  肖福魁  魏伟  孙予罕
作者单位:1. 中国科学院山西煤炭化学研究所,煤转化国家重点实验室,山西,太原,030001;中国科学院研究生院,北京,100049
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,山西,太原,030001
3. 宁阳县环境保护局,山东,宁阳,271400
摘    要:通过水热合成法一步合成了具有不同疏水基团-CH_3 、-(CH_3)_2 和-(CH_3)_3的双功能介孔固体酸SBA-15-SO_3H-(CH_3)_x催化剂.通过X射线粉末衍射(XRD)、N_2吸脱附、元素分析等方法对催化剂进行了表征,并在乙酸乙酯酯化反应中进行催化性能评价.结果表明,随着疏水前驱体中甲基数的增加,样品的疏水性增强.SBA-15-SO_3H-(CH_3)_x催化剂的催化活性随着疏水性的增强而提高,而具有较强疏水性的材料SBA-15-SO_3H-(CH_3)_3在反应中具有较高的催化性能.以SBA-15-SO_3H-(CH_3)_3为催化剂,酯化反应的最优条件为:温度为120℃,乙酸与乙醇摩尔比为4∶1,催化剂质量分数为1 %,反应时间为1h.在此条件下,乙醇的转化率和乙酸乙酯的选择性分别为93%和100%.

关 键 词:固体酸催化剂  介孔  疏水性  酯化反应
收稿时间:2009-02-16
修稿时间:2009-06-21

Synthesis of hydrophobic bifunctional mesoporous solid acid catalysts and their performance evalution in the esterification reaction of acetic acid with ethanol
XUE Hai-xia,LI Jun-ping,XU Zhen-qin,WANG Feng,ZHAO Ning,XIAO Fu-kui,WEI Wei,SUN Yu-han.Synthesis of hydrophobic bifunctional mesoporous solid acid catalysts and their performance evalution in the esterification reaction of acetic acid with ethanol[J].Journal of Fuel Chemistry and Technology,2009,37(6):747-751.
Authors:XUE Hai-xia  LI Jun-ping  XU Zhen-qin  WANG Feng  ZHAO Ning  XIAO Fu-kui  WEI Wei  SUN Yu-han
Abstract:Single-step synthesis of bifunctional mesoporous solid acid materials SBA-15-SO_3H-(CH_3)_x containing different hydrophobic alkyl (methyl, dimethyl or trimethyl) was carried out by hydrothermal treatment of gels. The catalysts were characterized by XRD, N_2 adsorption, elementary analysis, and were tested in the esterification reaction of acetic acid with ethanol. The results revealed that the hydrophobicity of the as-prepared materials increased with the increase of methyl number of hydrophobic precursors, and the catalytic activity increased with the hydrophobicity of the materials. Among these materials, SBA-15-SO_3H-(CH_3)_3 showed good performance toward the esterification reaction. Effects of reaction temperature, catalyst amounts, reaction time and the molar ratios of acetic acid/ ethanol over the catalyst SBA-15-SO_3H-(CH_3)_3 were also studied. Under the optimal reaction conditions of temperature 120℃, n(acetic acid)∶ n(ethanol) = 4∶1, catalyst 1%, time 1h, the conversion of ethanol and the selectivity of ethyl acetate were 93% and 100%, respectively.
Keywords:solid acid catalysts  mesoporous  hydrophobicity  esterification)
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