From natural aluminosilicate minerals to zeolites: synthesis of ZSM-5 from rectorites activated via different methods
From natural aluminosilicate minerals to zeolites: synthesis of ZSM-5 from rectorites activated via different methods
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从天然铝硅酸盐矿物到沸石：通过不同方法活化累托石合成 ZSM-5
DOI：
10.1016/j.clay.2015.07.040
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发表时间：
2015-10-01
影响因子：
5.6
通讯作者：
Bao, Xiaojun
中科院分区：
文献类型：
--
作者：
Liu, Haiyan;Shen, Tong;Bao, Xiaojun
从天然铝硅酸盐矿物合成沸石成功的关键在于有效活化。本文提出了一种基于亚熔盐（SMS）体系的节能高效方法。以累托石为例，研究了各种活化方法对所得矿物反应活性的影响。结果表明，在900℃热处理后，累托石转变为由扭曲的结晶态AlO₆和SiO₄/AlO₄单元组成的变累托石；在900℃碱熔后，结晶态的SiO₄单元解聚为二硅酸盐（Na₂SiO₃/Na₂Si₂O₂）和单硅酸盐（Na₄SiO₄），AlO₆/AlO₄单元转化为铝酸钠（NaAlO₂/Na₂Al₂O₄）；在250℃经亚熔盐活化后，SiO₄单元仅解聚为单硅酸盐，AlO₆/AlO₄单元转化为NaAlO₂和/或Na₂Al₂O₄。结果是，当以碱熔或亚熔盐活化的矿物为起始原料时，获得了纯相ZSM - 5沸石。（C）2015爱思唯尔有限公司。版权所有。
The key to success in synthesizing zeolites from natural aluminosilicate minerals is the effective activation. This article presents an energy-saving and high-efficient method based on a submolten salt (SMS) system. Taking rectorite as an example, the effects of various activation methods on the reactivity of the resulting minerals were investigated. The results showed that after being thermally treated at 900 degrees C, the rectorite was transformed into meta-rectorite consisting of distorted crystallized AlO6 and SiO4/AlO4 units; after being alkali-fused at 900 degrees C the crystallized SiO4 units were depolymerized into disilicates (Na2SiO3/Na2Si2O2) and monosilicates (Na4SiO4), and the AlO6/AlO4 units were converted into sodium aluminates (NaAlO2/Na2Al2O4); after being SMS-activated at 250 degrees C, the SiO4 units were exclusively depolymerized into monosilicates, and the AlO6/AlO4 units were converted into NaAlO2 and/or Na2Al2O4. As a result, when taking the alkali-fused or SMS-activated minerals as the starting materials, pure-phase ZSM-5 zeolites were obtained. (C) 2015 Elsevier B.V. All rights reserved.