An Interrupted Zeolite PKU-26 and Its Transformation to a Fully Four-Connected Zeolite PKU-27 upon Calcination

被引：3

作者：

Chen, Yanping ^{[1
]}

Ma, Ning ^{[1
]}

Huang, Shiliang ^{[2
]}

Du, Xin ^{[1
]}

Liao, Fuhui ^{[1
]}

Zh, Yuexiang ^{[1
]}

Sun, Junliang ^{[1
]}

Wang, Yingxia ^{[1
]}

机构：

[1] Peking Univ, Coll Chem & Mol Engn, BNLMS, Beijing 100871, Peoples R China

[2] China Acad Engn Phys, Inst Chem Mat, Mianyang 621900, Peoples R China

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2019年 / 25卷 / 13期

基金：

中国国家自然科学基金;

关键词：

mechanism; microporous materials; silicogermanate; structural transformation; zeolite framework; BOROSILICATE ZEOLITE; FRAMEWORK TOPOLOGY; PHASE-TRANSITION; PERIODIC B3LYP; FAMILY; UNITS; OCTADECASIL; D4R;

D O I：

10.1002/chem.201805972

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The thermal stability and structural transformation mechanism are critical for the industrial applications of zeolites and the design of new framework types. Herein, a new zeolite PKU-26 has been hydrothermally synthesized under fluoride conditions using a tetraethylammonium (TEA(+)) cation as the structure-directing agent (SDA) and its framework contains partial Q(3) T atoms [Q(3) for T(-O-T)(3)OH]. Upon calcination, PKU-26 processed a single-crystal to single-crystal transformation to another novel zeolite PKU-27 with the elimination of terminal -OH groups and enhanced thermal stability up to 650 degrees C, exhibiting the first Q(3)Q(4) transformation [Q(4) for T(-O-T)(4)] in 3D zeolite frameworks. The mechanism of the structural transformation, involving proton transfer, framework dehydration, and TO4 reconstruction, is proposed and supported by theoretical calculations.

引用

页码：3219 / 3223

页数：5

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