Synthesis of NaY zeolite from a submolten depolymerized perlite:Alkalinity effect and crystallization kinetics  

作　　者：Yanli Qu Peng Dong Li Yang Yuanyuan Yue Haoliang Wang Jingcai Cheng Chao Yang 

机构地区：[1]CAS Key Laboratory of Green Process and Engineering,State Key Laboratory of Petroleum Molecular&Process Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [2]School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100190,China [3]Qingyuan Innovation Laboratory,Quanzhou 362801,China [4]National Engineering Research Center of Chemical Fertilizer Catalyst,College of Chemical Engineering,Fuzhou University,Fuzhou 350108,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第6期130-138,共9页中国化学工程学报（英文版）

基　　金：supports from National Natural Science Foundation of China(21938009,22308358,22208346,22078332);National Key Research and Development Program(2022YFC3902701);Ningxia Natural Science Foundation(2021AAC01002);the External Cooperation Program of BIC,Chinese Academy of Sciences(122111KYSB20190032);CAS Project for Young Scientists in Basic Research(YSBR-038)are gratefully acknowledged.

摘　　要：NaY zeolites are synthesized using submolten salt depolymerized natural perlite mineral as the main silica and alumina sources in a 0.94 L stirred crystallizer.Effects of alkalinity ranging from 0.38 to 0.55(n(Na_(2)O)/n(SiO_(2)))on the relative crystallinity,textural properties and crystallization kinetics were investigated.The results show that alkalinity exerts a nonmonotonic influence on the relative crystallinity and textural properties,which exhibit a maximum at the alkalinity of 0.43.The nucleation kinetics are studied by fitting the experimental data of relative crystallinity with the Gualtieri model.It is shown that the nucleation rate constant increases with increasing alkalinity,while the duration period of nucleation decreases with increasing alkalinity.For n(Na_(2)O)/n(SiO_(2))ratios ranging from 0.38 to 0.55,the as-synthesized NaY zeolites exhibit narrower crystal size distributions with the increase in alkalinity.The growth rates determined from the variations of average crystal size with time are 51.09,157.50,46.17 and 24.75 nm·h^(-1),respectively.It is found that the larger average crystal sizes at the alkalinity of 0.38 and 0.43 are attributed to the dominant role of crystal growth over nucleation.Furthermore,the combined action of prominent crystal growth and the longer duration periods of nucleation at the alkalinity of 0.38 and 0.43 results in broader crystal size distributions.The findings demonstrate that control of the properties of NaY zeolite and the crystallization kinetics can be achieved by conducting the crystallization process in an appropriate range of alkalinity of the reaction mixture.

关 键 词：NaY zeolite Submolten salt depolymerized perlite ALKALINITY Crystallization kinetics 

分 类 号：TQ424.25[化学工程]