Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 106: Issue 3
Model-free kinetics applied for the removal of CTMA+ and TPA+ of the nanostructured hybrid AlMCM-41/ZSM-5 material
Authors:
Maria J. F. Costa Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil

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Antonio S. Araujo Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil

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Edjane F. B. Silva Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil

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Mirna F. Farias Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil

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Valter J. Fernandes Jr. Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, RN, 59078-970, Brazil

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Petrus d’Amorim Santa-Cruz Department of Fundamental Chemistry, Federal University of Pernambuco, Recife, PE, 50740-540, Brazil

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José G. A. Pacheco Department of Chemical Engineering, Federal University of Pernambuco, Recife, PE, 50740-521, Brazil

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Pages:
767–771
Online Publication Date:
13 Feb 2011
Publication Date:
01 Dec 2011
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-011-1297-z
Keywords:
Hybrid AlMCM-41/ZSM-5; Calcination; Thermal decomposition; Model-free kinetic; Thermogravimetry
Restricted access

Abstract

The nanostructured hybrid AlMCM-41/ZSM-5 composite was synthesized starting from a hydrogel with molar composition SiO2:0.32Na2O:0.03Al2O3:0.20TPABr:0.16CTMABr:55H2O. The cetyltrimethylammonium bromide (CTMABr) and tetrapropylammonium bromide (TPABr) were used as templates. The above mentioned material presents morphological properties with specific characteristics, such as the surface area of the composite which is approximately half of the surface area of the conventional MCM-41. Another interesting feature is the formation of walls with the double of the density of the MCM-41 structure, which characterizes the hybrid material, resulting in a high stability material for catalytic application. The aim of this study is obtain optimized structures of the hybrid material and for this purpose variations in the synthesis time were carried out. A comparative analysis was performed including X-ray diffraction, Fourier transform infrared spectroscopy, and Thermogravimetry measurements. The model-free kinetic algorithms were applied in order to determinate conversion and apparent activation energy of the decomposition of the CTMA+ and TPA+ species from the hybrid AlMCM-41/ZSM-5.

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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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