Structural evolution of dealuminated Y zeolites during KOH solution treatment

被引：23

作者：

Liu, DS ^{[1
]}

Bao, SL ^{[1
]}

Xu, QH ^{[1
]}

机构：

[1] NANJING UNIV,DEPT CHEM,NANJING 210008,PEOPLES R CHINA

来源：

ZEOLITES | 1997年 / 18卷 / 2-3期

关键词：

dealuminated Y zeolites; realumination; nmr FT ir;

D O I：

10.1016/S0144-2449(96)00129-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

H(4)EDTA- and (NH4)(2)SiF6- liquid phase dealuminated Y zeolites (EDY and FDY) and hydrothermally dealuminated Y zeolites (USY) were treated with an aqueous solution of KOH. The products were characterized by using XRD, n.m.r., FT i.r., SEM, and fast atom bombardment mass spectroscopy (FABMS) techniques. A decrease of Si/Al ratios was observed in the basic solution-treated samples. The results clearly show that dissolution of the surface of EDY and removal of silicon atoms from the framework lattice of FDY occurs during basic solution treatment. Realumination of ultrastable Y zeolite (USY) takes place through reinsertion of aluminum into the framework vacancies formed during hydrothermal treatment of NH4NaY or formed during a basic solution treatment of USY. (C) Elsevier Science Inc. 1997.

引用

页码：162 / 170

页数：9

共 15 条

[1] STRUCTURAL EVOLUTION OF DEALUMINATED Y-ZEOLITES DURING VARIOUS CHEMICAL TREATMENTS [J].