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Immobilization of Polymer-Protected Ultrafine Metal Particles for Catalyst.

用于催化剂的聚合物保护的超细金属颗粒的固定化。

基本信息

批准号：
62850146
负责人：
HIRAI Hidefumi
金额：
$ 3.9万
依托单位：
Science University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62850146/
关键词：
Polymer Protected Metal Particles Ultrafine Particles of Metals Hydrogenation of Olefins Immobilized Catalysts Ultrafine Particles of Rhodium パラジウム超微粒子

项目摘要

Dispersions of ultrafine particle of rhodium were prepared as dark brown homogeneous solutions by refluxing ethanol-water mixture (1:1 in volume) of rhodium(III) chloride for 1 h in the presence of the methyl acrylate and N-vinyl-2-pyrrolidone copolymer. Electron microscopy showed that rhodium particles having dimateters 20-80A^^゜ were highly dispersed without coaggregation and their average diameter was 50A^^゜.The ultrafine particles of rhodium protected by the copolymer are treated with polyacrylamide gel having amino groups, resulting in immobilization of the particles onto the gel. The immobilization was successfully achieved in the pH region of 4-9. The binding of the particles to the gel was stable, and no release of the particles from the gel was detected when ph of the mixture was changed in a wide range (from 2 to 13) after the immobilization. The immobilized catalyst remained also intact when it was repeatedly washed with water. The gel-immobilized rhodium particles exhibited 2-22 fold larger catalytic activities than a commercial rhodium carbon catalyst for hydrogenation of olefins at 30 c under 1 atm.

在甲基丙烯酸甲酯和N-乙烯-2-吡咯烷酮共聚物的存在下，以1：1体积比的乙醇-水混合物回流反应1h，可制得分散的深褐色均相溶液。电子显微镜观察表明，粒径为20~80A゜的Rh粒子高度分散，平均粒径为50A゜。用含氨基的聚丙烯酰胺凝胶对共聚物保护的超细Rh粒子进行处理，使其固定在凝胶上。在pH为4~9的范围内成功地实现了固定化。当固定化后混合液的pH值在较大范围内(从2到13)变化时，颗粒与凝胶的结合稳定，没有检测到颗粒从凝胶中释放出来。固定化催化剂在用水反复洗涤时也保持完好。在30℃、1大气压下，凝胶固定化的Rh粒子的催化活性是商用Rh C催化剂的2-22倍。