Mesoporogen-free synthesis of hierarchical sodalite as a solid base catalyst from sub-molten salt-activated aluminosilicate  

作　　者：Jinbiao Yang Tiesen Li Xiaojun Bao Yuanyuan Yue Haiyan Liu 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,China University of Petroleum,18 Fuxue Road,Beijing 102249,China [2]East-China Design Branch,China Petroleum Engineering&Construction Corporation,2 Huayan Road,Qingdao 266071,China [3]National Engineering Research Center of Chemical Fertilizer,College of Chemical Engineering,Fuzhou University,2 Xueyuan Road,Fuzhou 350116,China

出　　处：《Particuology》2020年第1期48-54,共7页颗粒学报（英文版）

基　　金：The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China(grant Nos.91434206,21506034,and 21276270).

摘　　要：A rapid and environmentally friendly approach to synthesize hierarchical sodalite from natural aluminosilicate mineral without the involvement of any mesoporogen or post-synthesis treatment was developed.This strategy involves three important steps:the first is the depolymerization of an aluminosilicate mineral into highly reactive silicon and aluminum species with ideal meso-scale structures through activation of a sub-molten salt.The second step is the hydrolysis and condensation of the activated aluminosilicate mineral into zeolitic precursors that also have a meso-scale structure.The third is the rapid zeolitization of the zeolitic precursors through the reversed crystal growth route at room temperature and ambient pressure to form hierarchical sodalite.The physicochemical properties of the as-synthesized sodalite were systematically characterized,and the formation mechanism of the hierarchical pore structure was discussed.When used as a solid base catalyst for Knoevenagel condensation,the as-synthesized sodalite and its potassium ion-exchanged product with hierarchical micro-meso-macroporous structure both exhibited high catalytic activity and product selectivity.

关 键 词：Natural aluminosilicate mineral Hierarchical sodalite Reversed crystal growth route Kirkendall effect Solid base catalyst Knoevenagel condensation 

分 类 号：O62[理学—有机化学]