表面修饰多壁碳纳米管负载二氧化钛的制备及催化碳酸二甲酯与苯酚酯交换反应的性能

制备了表面修饰多壁碳纳米管负载TiO2的催化剂，并将其应用于碳酸二甲酯与苯酚的酯交换反应．采用x射线电子能谱、透射电子显微镜、低温N2吸附一脱附和x射线衍射等对催化剂进行了表征．结果表明，以低浓度的氨水（0．4％）代替去离子水作为沉淀剂时，制备的催化剂显示出更好的催化活性、分离性与重复使用性．考察了TiO2负载量、催化剂用量及反应时间对反应性能的影响．在最佳反应条件下，苯酚转化率为42．5％，碳酸甲苯酯与碳酸二苯酯的总选择性达到99．9％以上．经过4次重复使用后，催化剂的活性略有下降．...

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Bibliographic Details
Published in催化学报 Vol. 35; no. 4; pp. 481 - 489
Main Author 周喜 葛鑫 唐荣芝 陈彤 王公应
Format Journal Article
LanguageChinese
Published a中国科学院成都有机化学研究所催化中心，四川 成都 610041 2014
b邵阳学院生物与化学工程系，湖南 邵阳 422000%a中国科学院成都有机化学研究所催化中心,四川 成都,610041
Subjects
二氧化钛
多壁碳纳米管
沉淀剂
碳酸二苯酯
酯交换
碳酸二苯酯
二氧化钛
Multi-walled carbon nanotube
酯交换
Diphenyl carbonate
Transesterification
Titanium dioxide
沉淀剂
Precipitant
多壁碳纳米管
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ISSN0253-9837
1872-2067
DOI10.1016/S1872-2067(14)60010-3

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Summary:制备了表面修饰多壁碳纳米管负载TiO2的催化剂，并将其应用于碳酸二甲酯与苯酚的酯交换反应．采用x射线电子能谱、透射电子显微镜、低温N2吸附一脱附和x射线衍射等对催化剂进行了表征．结果表明，以低浓度的氨水（0．4％）代替去离子水作为沉淀剂时，制备的催化剂显示出更好的催化活性、分离性与重复使用性．考察了TiO2负载量、催化剂用量及反应时间对反应性能的影响．在最佳反应条件下，苯酚转化率为42．5％，碳酸甲苯酯与碳酸二苯酯的总选择性达到99．9％以上．经过4次重复使用后，催化剂的活性略有下降．
Bibliography:Modified multi-walled carbon nanotube-supported TiO2 samples were prepared and used as an efficient heterogeneous catalyst for the transesterification of dimethyl carbonate with phenol. The catalysts were characterized by X-ray photoelectron spectroscopy, transmission electron micros copy, N2 adsorption-desorption, and X-ray powder diffraction. The results showed that the catalyst, which was prepared using a low concentration （0.4%） of ammonium hydroxide as the precipitant instead of ionized water, had better catalytic activity, separability, and reusability properties. The effects of the Ti02 loading, amount of catalyst and reaction time on the performance of the trans- esterification reaction were also studied. Under the optimum reaction conditions, the conversion of phenol reached 42.5% with over 99.9% selectivity for methyl phenyl carbonate and diphenyl car bonate. The catalyst could be reused for the transesterification in four runs with only slight loss of its catalytic activity.
Multi-walled carbon nano
ISSN:0253-9837
1872-2067
DOI:10.1016/S1872-2067(14)60010-3