A Quasi-Solid-Phase Approach to Activate Natural Minerals for Zeolite Synthesis
A Quasi-Solid-Phase Approach to Activate Natural Minerals for Zeolite Synthesis
复制标题
一种准固相方法来活化天然矿物以合成沸石
DOI：
10.1021/acssuschemeng.6b03031
复制
发表时间：
2017-04-01
影响因子：
8.4
通讯作者：
Bao, Xiaojun
中科院分区：
文献类型：
--
作者：
Yang, Jinbiao;Liu, Haiyan;Bao, Xiaojun
Synthesis of zeolites or zeolite/clay composites from natural aluminosilicate minerals has received extensive attention because of its great usefulness in greening the zeolite manufacturing process, in which effective activation of natural aluminosilicate minerals is crucially important. Herein, we present an energy saving and green approach, the quasi-solid-phase activation method, to efficiently destruct the natural minerals under the conditions of a temperature as low as 100 degrees C and an activation time as short as 30 min. Our strategy consists of the following three steps: (1) preparation of a mixture of a natural kaolin mineral, NaOH, and water by kneading, (2) extruding of the mixture into sticks, and (3) low-temperature calcination of the stick, featured by the combined use of mechanochemical actions. The results showed that 84.7% Si species and 69.0% Al species in the kaolin mineral underwent a large degree of depolymerization in the kneading extruding steps, and following calcination at 100 degrees C resulted in the complete depolymerization of the kaolin mineral to monomer orthosilicate anions (Q) and tetra coordinated aluminum (A(IV)) species, which are highly active silica and alumina sources for synthesizing aluminosilicate zeolites. Using the activated kaolin mineral as a starting material, pure-phase NaY and NaA zeolites have been successfully synthesized.
