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Development of heterogeneous catalysts with molecular recognition by a molecular imprinting technique

通过分子印迹技术开发具有分子识别功能的多相催化剂

基本信息

批准号：
13650838
负责人：
SHIDO Takahumi
金额：
$ 2.3万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650838/
关键词：
Molecular imprinting Heterogeneous acid catalysis Ester hydrolysis Template Catalyst design Surface attaching 水素化反応不均一系触媒 EXAFS 制御不均一触媒 BET 加水分解水素化基質選択性

项目摘要

The aim of this study is to development of heterogeneous catalysts with molecular recognition by a molecular imprinting technique.We attempted to prepare a molecular imprinting catalyst which exhibits acid-base catalysis for hydrolysis of esters. Assuming a tetrahedral coordination conformation as a transition state model for the ester hydrolysis, we used a phosphorous compound as a template molecule for hydrolysis of ethyl acetate. The phosphorous template was adsorbed on an alumina surface, followed by formation of silica matrix overlayers surrounding the template. Then the template was extracted with ethanol. About 85 % of the templated adsorbed on the surface was removed to leave a cavity behind the template. The obtained catalyst showed a good performance for the hydrolysis of ethyl acetate. Hydrolysis of the larger ester molecules than the template was inhibited, while hydrolysis of the esters with molecular sizes equivalent to and smaller than the template size was promoted on the molecular imprinting catalyst with the template cavity.

本研究的目的是利用分子印迹技术开发具有分子识别功能的多相催化剂，尝试制备一种具有酸碱催化作用的分子印迹催化剂，用于酯的水解反应。假设四面体配位构象作为酯水解的过渡态模型，我们使用磷化合物作为乙酸乙酯水解的模板分子。将磷模板吸附在氧化铝表面上，随后形成围绕模板的二氧化硅基质覆盖层。然后用乙醇提取模板。约85%吸附在表面上的模板被去除，在模板后面留下空腔。该催化剂对乙酸乙酯的水解反应具有良好的催化性能。在具有模板空腔的分子印迹催化剂上，比模板分子大的酯分子的水解被抑制，而分子大小等于或小于模板分子的酯分子的水解被促进。