负载型KI催化甘油与CO2合成甘油碳酸酯.pdf

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CHEMICAL INDUSTRY AND ENGINEERING PROGRESS2015年第34卷第2期
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负载型KI催化甘油与CO2合成甘油碳酸酯
王富丽,黄世勇,余青云2,黄媚,孙果宋
广西壮族自治区化工研究院,广西南宁530006;2广西大学化学化工学院,广西南宁530004)
摘要:添加不同组分对氧化铝載体进行调变改性,再以改性氧化铝为载体,负载I制各了一系列负載型催化剂
KI/Al2O3-MgO、KIAl2O3-ZnO、KIAl2O3-TiO2和KAl2O3-2ZrO2,并通过CO2、环氧丙烷和甘油合成甘油碳酸酯
反应评价其催化活性,发现KIAl2O3-Mg0具有最高的活性。由不同載体的CO2-TPD分析可以发现,载体表面
少量碱性位的存在有利于反应进行。实验研究了不同负载量KIA1O3-MgO的活性及稳定性,发现K[负载量为
.5 mmog较为适宜。同时,实验又通过N2吸附/脱附(BET)、X射线衍射(XRD)等手段对不同负载量的
KI/A2O3-MgO进行了表征,进一步说明了负載量过多会导致KI晶粒团聚,并阻塞载体孔道。优化了反应条件,
在最佳条件下(环氧丙烷0.3mol,甘油0.1mol,反应温度130℃,反应时间2h,反应压力6.0MPa),甘油的转
化率为65.5%,甘油碳酸醋的产率为60.8%。
关键词:甘油;二氧化碳;催化;甘油碳酸酯;多相反应
中图分类号:TQ426.8文献标志码:A文章编号:1000-6613(2015)02-0402-06
DOI:10.16085/j.iss.1000-6613.2015.02.016
Synthesis of glycerol carbonate from glycerol and CO2 by supported KI
catalysts
WANG Fuli HUANG Shiyong, YU ingun, HUANG Mei, SUN Guosong
(Guangxi Research Institute of Chemical Industry, Nanning 530006, Guangxi, China, School of Chemistry and
Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China)
Abstract: Different components were chosen to modify alumina and then KI was loaded on the surface
of modified alumina, and a series of supported KI catalysts were prepared, such as KIAL2O3-MGO
KI/Al2 O3-zno K1/Al2 O -Tio2 and KI/Al2 O3 -Zro>. The catalytic activities were evaluated by the
reaction of CO2, propylene epoxide and glycerol to synthesize glycerol carbonate and KI/A120 -Mgo
was found to be the best one. Through CO2-TPD of diffirent supports, it could be found that a few basic
positions on the surface of supports were favorable to the reaction. The catalytic activity and stability
of KI/Al2o -Mgo with different loading amounts were investigated and the optimal loading amount o
KI was 1. 5mmol/g. At the same time, KI/A12O3 -Mgo was characterized by N2 adsorption/desorption
(BET)and X ray diffraction(XRD). Overfull loading amount could lead to agglomeration of KI
crystals and blockage of support pores. Reaction conditions were optimized. Under the optima
conditions(propylene oxide 0. 3 mol, glycerol 0. Imol, reaction temperature 130 C, reaction time 2h, and
reaction pressure 6.0MPA), conversion of glycerol was 65.5% and yield of glycerol carbonate was 60.8%
Key words: glycerol; carbon dioxide; catalysis; glycerol carbonate; multiphase reaction
生物柴油作为一种新型绿色能源越来越受到世收稿日期:2014-05-16;修改稿日期:20409-21
界各国的广泛关注。然而,生物柴油制备过程中会
基金项目:广西自然科学基金项目(2011G
第一作者:王富丽(1976一),女,硕士,工程师,研究方向为绿色化
副产甘油,若能实现甘油的高效转化,可以有效地学联系人:黄世勇,博士,高级工程师E- mail shiyonghuang(@63com