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.

开发了一种快速，环保的方法，无需任何介孔原或合成后处理，即可从天然铝硅酸盐矿物合成分层方钠石。该策略涉及三个重要步骤：第一是通过活化亚熔融盐将铝硅酸盐矿物解聚为具有理想介观尺度结构的高反应性硅和铝物质。第二步是将活化的铝硅酸盐矿物水解和缩合为也具有中尺度结构的沸石前体。第三是在室温和环境压力下通过反向的晶体生长途径将沸石前体快速沸石化以形成分级方钠石。系统地表征了合成的方钠石的理化性质，并探讨了孔结构分层的形成机理。当用作Knoevenagel缩合反应的固体基础催化剂时，刚合成的方钠石及其具有分级的微介观大孔结构的钾离子交换产物均显示出高催化活性和产物选择性。