Hole-growth phenomenon during pyrolysis of a cation-exchange resin particle  

作　　者：Zheng-liang HUANG Yun-bo YU Qi SONG Yao YANG Jing-yuan SUN Jing-dai WANG Yong-rong YANG 

机构地区：[1]Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,College of Chemical and Biological Engineering,ZhejiangUniversity,Hangzhou 310027,China [2]State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2022年第12期974-987,共14页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the Joint Funds of the National Natural Science Foundation of China (No. U21B2095);the Major Research Project of National Natural Science Foundation of China (No. 91834303);the Science Fund for Creative Research Groups of National Natural Science Foundation of China (No. 61621002)。

摘　　要：A novel central hole-expansion phenomenon is identified, in which the cation-exchange resin is pyrolyzed in a mixed atmosphere of nitrogen and oxygen at 400–500 ℃. In this reaction, the reaction path is predictable and always starts from the center of the resin particle to form a central hole, then continues and expands around the hole, finally forming a uniformly distributed hole group;the particle surface remains intact. Analysis shows that this formation mode is due to the different reaction paths of sulfonic groups between the surface and interior of the particle, caused by the temperature difference. On the surface, transformation reactions happen at high temperatures(410–500 ℃) to form stable organic sulfur structures, while decomposition occurs inside the particle at a relatively low temperature(<410 ℃) and promotes complete pyrolysis of the copolymer matrix to form holes.

关 键 词：Non-catalytic gas-solid reaction Cation-exchange resin PYROLYSIS Central-hole expansion Temperature difference TRANSFORMATION 

分 类 号：TQ03[化学工程]