Facile and fast synthesis of highly active Lewis acid MWW zeolite from pure silica ITQ-1
Facile and fast synthesis of highly active Lewis acid MWW zeolite from pure silica ITQ-1
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DOI：
10.1039/d2qi00611a
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发表时间：
2022-05-24
影响因子：
7
通讯作者：
Ren, Limin
中科院分区：
文献类型：
--
作者：
Wang, Tianlong;Huang, Wei;Ren, Limin
提出了一种简单的水热蚀刻-修复策略来制备基于纯二氧化硅ITQ-1前体的Sn-MWW沸石，该策略避免使用任何支撑剂和添加剂，如B3+和Na+。因此，不需要合成后的酸处理来去除这些添加剂以确保催化性能，这是对常规Sn-MWW合成路线的极大改进。此外，低有机结构导向剂（SDA）的消耗和快速增长使这种方法实际上具有吸引力。生长机制的研究揭示了至关重要的蚀刻和愈合的SDA，这导致成功的Sn引入的双重功能的作用。所得的Sn-MWW具有良好的葡萄糖异构化催化性能，这归因于其“干净”（没有添加剂的副作用）和明确的Sn位。
A facile hydrothermal etching-healing strategy is proposed to fabricate a Sn-MWW zeolite based on a pure silica ITQ-1 precursor, which avoids using any supporting agents and additives, such as B3+ and Na+. Thus, post-synthetic acid treatments for the removal of such additives to ensure catalytic performance are not required, which is a great improvement to the conventional Sn-MWW synthetic route. Moreover, low organic structure-directing agent (SDA) consumption and rapid growth make this approach practically attractive. The growth mechanism study reveals the crucial etching and healing dual functional role of the SDA, which leads to successful Sn introduction. The obtained Sn-MWW exhibits excellent glucose isomerization catalytic performance owing to the "clean" (without the side effect of additives) and well-defined Sn sites.