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Type: Artigo de periódico
Title: Thermochemistry of n-alkylamines interaction with ETS-10 titaniunsilicate
Author: Ruiz, JAC
Ruiz, VSO
Airoldi, C
Pastore, HO
Abstract: According to the data from calorimetric adsorption of methylamine, under the best experimental conditions, 10 mg ETS-10 was saturated with 20 mul portions of an aqueous solution of methylamine at 0.05 mol dm(-3) concentration corresponding to 0.490 mmol of methylamine per gram of solid. From calorimetric titration data, the thermodynamic values of DeltaH, DeltaG and DeltaS were calculated, showing favourable n-alkylamine-ETS-10 interactions, from which the most favourable occurs for n-butylamine. The adsorption of these bases did not affect the structure of the titaniunsilicate as the XRD profile of ETS-10 is not altered. The FTIR spectra showed that with the increase in the amine mass the bands corresponding to the symmetric and asymmetric deformations at 1390 and 1467 cm(-1) increase in intensity along with the NH2 deformation at 1530 cm(-1) as expected. The thermogravimetry shows two mass losses for ETS-10 that correspond to physisorbed water and water in smaller channels and cavities. After methylamine adsorption, the same behaviour was observed, however for butyl- and pentylamine three other mass losses were observed corresponding to decomposition and/or release of n-alkylamines. (C) 2003 Elsevier B.V. All rights reserved.
Subject: ETS-10
Country: Holanda
Editor: Elsevier Science Bv
Citation: Thermochimica Acta. Elsevier Science Bv, v. 411, n. 2, n. 133, n. 138, 2004.
Rights: fechado
Identifier DOI: 10.1016/j.tca.2003.08.007
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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