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

TitleEnhanced negative thermal expansion in MFI molecular sieves by varying framework composition
Publication TypeJournal Article
Year of Publication2010
AuthorsBhange, DS, Ramaswamy, V
JournalMicroporous and Mesoporous Materials
Volume130
Issue1-3
Pagination322-326
Date PublishedMAY
ISSN1387-1811
KeywordsHTXRD, Negative thermal expansion, Silicalite-1
Abstract

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.

DOI10.1016/j.micromeso.2009.11.029
Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)3.220
Divison category: 
Catalysis and Inorganic Chemistry