Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 87: Issue 2
Acid properties of semicrystalline zeolitic mesoporous UL-ZSM-5 materials
Authors:
A. Ungureanu Department of Chemical Engineering, Laval University, Ste Foy, Québec, Canada, G1K 7P4
Laboratory of Catalysis, Technical University of Iasi, Iasi, Romania, 6600, 71 D. Mangeron

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H. V. Thang Department of Chemical Engineering, Laval University, Ste Foy, Québec, Canada, G1K 7P4

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D. Trong On Department of Chemical Engineering, Laval University, Ste Foy, Québec, Canada, G1K 7P4

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E. Dumitriu Laboratory of Catalysis, Technical University of Iasi, Iasi, Romania, 6600, 71 D. Mangeron

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S. Kaliaguine Department of Chemical Engineering, Laval University, Ste Foy, Québec, Canada, G1K 7P4

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Pages:
417–422
Online Publication Date:
07 Feb 2007
Publication Date:
01 Jan 2007
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-006-6891-0
Keywords:
acidity; FTIR; mesoporous molecular sieves; microcalorimetry; UL-zeolites; zeolites
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Abstract

UL-ZSM-5 materials have been prepared by templated solid-state crystallization of zeolites starting from the amorphous mesostructured aluminosilicate Al-Meso. Microcalorimetry and FTIR have been employed to characterize their surface acidity. In good agreement with 27Al MAS NMR data, UL-ZSM-5 displayed an improved density and strength of Brönsted acid sites, as compared to Al-Meso, owing to the incorporation of aluminium in a tetrahedral environment similar to that of zeolite ZSM-5. Moreover, they showed an enhanced Brönsted/Lewis relative acid ratio. However, Al-Meso showed the highest concentration of strong Lewis acid sites due to its largest amount of aluminium in extraframework positions.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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