Enhanced negative thermal expansion in MFI molecular sieves by varying framework composition

被引：15

作者：

Bhange, D. S. ^{[1
]}

Ramaswamy, Veda ^{[2
]}

机构：

[1] Natl Chem Lab, Catalysis Div, Pune 411008, Maharashtra, India

[2] Cent Leather Res Inst, Chem Phys Lab, Madras 600020, Tamil Nadu, India

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2010年 / 130卷 / 1-3期

关键词：

Silicalite-1; HTXRD; Negative thermal expansion; NEUTRON POWDER-DIFFRACTION; ZEOLITES; SILICA; CHABAZITE; BEHAVIOR; ZSM-5; CU;

D O I：

10.1016/j.micromeso.2009.11.029

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

In the present investigations we have carried out the high temperature X-ray diffraction (HTXRD) studies on the metallosilicate molecular sieves iron silicalite-1 (FeS-1) samples of different Si/M ratios (Si/Fe = 50, 75, 100 and infinity) for their negative thermal expansion (NTE) behavior. All the samples exhibit NTE behavior in the temperature range 373-773 K. Systematic increase in negative thermal expansion coefficient is observed as a function of increasing Fe content in the MFI framework. Strength of the negative thermal expansion increases in the order Si/Fe = infinity < 100 < 75 < 50. It is concluded that by changing the composition of the framework of MFI, enhanced negative thermal expansion can be obtained. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：322 / 326

页数：5

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