几种粘土的孔隙结构与催化活性的研究

本文研究了五种不同产地的粘土在作为棉子油酸聚合反应催化剂时,其催化活性与孔隙结构的关系,采用气相流动色谱法,在液氮温度下测定粘土对氮气的吸附量,给出吸附及脱附等温线,确定其孔隙结构,对几种粘土作了差热分析及扫描电镜观察。研究结果表明:吉林粘土催化剂对棉子油酸聚合反应所得二聚酸的产率较高;所测样品均有较发达的中孔,孔径在30—40Å范围内的粘土对生成二聚酸有较好的选择性。

STUDY ON THE PORE STRUCTURE AND CATALYTIC ACTIVITY OF CLAY

This paper is concerned with the relation between the catalytic activity and pore structure of five kinds of clay from different places used as catalyst for the polymerization of cottonseed oil acid. The amount of N₂ adsorption on the clays was measured by means of gas chromatography at the temperature of liquid nitrogen. The types of the pore structure of clay were estimated from the isotherms of the adsorption and desorption as well as from the DTA and SEM bbservations. The calculated results show that all the samples are rich in the porosiy of medium size. since it gives the highest yield of dimeric octadecadienoic acid, the Jilin clay which has the pore diameter of d= 30-40Å showed a better specificity in the formation of the dimeric acid.