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Title: Preparation, characterisation and evaluation of brazilian clay-based catalysts for use in esterification reactions
Authors: Rezende, Michelle J. C.
Pereira, Mírian da Silva Costa
Santos, Gabriel F. N.
Aroeira, Gabriel O. P.
Albuquerque Junior, Tiago C.
Suarez, Paulo Anselmo Ziani
Pinto, Angelo C.
Assunto:: Ativação ácida
Argila
Esterificação
Issue Date: 2012
Publisher: Sociedade Brasileira de Química
Citation: REZENDE, Michelle J. C. et al. Preparation, characterisation and evaluation of brazilian clay-based catalysts for use in esterification reactions. Journal of the Brazilian Chemical Society, São Paulo, v. 23, n. 7, p. 1209-1215, jul. 2012. DOI: http://dx.doi.org/10.1590/S0103-50532012000700003. Disponível em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532012000700003&lng=en&nrm=iso&tlng=en. Acesso em: 12 out. 2020.
Abstract: Catalisadores a base de argilas naturais brasileiras foram preparados, caracterizados, e sua atividade catalítica foi avaliada em reações de esterificação. As argilas naturais foram ativadas por tratamento ácido como recebidas, sem qualquer tratamento prévio. As argilas naturais e as argilas ácidas foram caracterizadas por DRX, TPD-NH3, termodessorção de n-butilamina, análise de adsorção de N2, FT-IR, TGA e DTA. O desempenho catalítico foi investigado em reações de esterificação de diversos ácidos carboxílicos com diferentes álcoois. As reações foram realizadas com razão molar ácido carboxílico/álcool 1:3, a 100 ºC e pressão atmosférica, por 3 h. As argilas ácidas forneceram boas conversões e apresentaram desempenho melhor que a argila comercial K10.
Abstract: Natural Brazilian clay-based catalysts were prepared, characterised, and their catalytic activity was assessed in esterification reactions. The natural clays were acid activated as received, without any previous treatment. Both natural and acid-activated clays were characterised by XRD, NH3-TPD, thermodesorption of n-butylamine, N2 adsorption analysis, FT-IR, TGA and DTA. The catalytic performance was investigated in the esterification of several carboxylic acids with different alcohols. The reactions were carried out in a 1:3 carboxylic acid/alcohol molar ratio at 100 ºC and atmospheric pressure for 3 h. The acid-activated clays provided good yields and better performance than commercial clay K10.
Licença:: Journal of the Brazilian Chemical Society - (CC BY-NC) - All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. Fonte: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532012000700003&lng=en&nrm=iso&tlng=en. Acesso em: 12 out. 2020.
DOI: https://dx.doi.org/10.1590/S0103-50532012000700003
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