NaY and CrY zeolites ion exchange. Thermodynamics

Authors

  • Lucia Tagami UEM
  • Onelia Aparecida Andreo dos Santos UEM
  • Eduardo Falabella Sousa-Aguiar CENPES/PETROBRAS
  • Pedro Augusto Arroyo UEM
  • Maria Angélica Simões Dornellas de Barros UEM

DOI:

https://doi.org/10.4025/actascitechnol.v23i0.2761

Keywords:

Cromo, troca iônica, isoterma, zeólita Y, propriedades termodinâmicas

Abstract

Isotherm ion exchange of Y zeolite has been studied at different temperatures. The direct exchanges of chromium in NaY show a very high selectivity to the in-going Cr3+ ion. It was also shown that exchange increases with increasing temperature. On the other hand, the reverse isotherms in Cr-NaY are non-preferential process. In both cases Kielland plots and thermodynamic properties such as standard enthalpy of ion exchange (ΔHo), standard free energy of ion exchange (ΔGo), and standard entropy of ion exchange (ΔSo) were calculated. Thermodynamic properties show a favorable process for direct exchange. The reverse exchange process is less sensitive to the changes in temperature due to the high energy needed to replace 3Na+ by Cr3+ in the zeolitic phase

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Author Biography

Maria Angélica Simões Dornellas de Barros, UEM

Possui graduação em Engenharia Quí­mica pela Universidade Estadual de Maringá (1992) , mestrado em Engenharia Quí­mica pela Universidade Estadual de Maringá (1996) e doutorado em Programa de Pós Graduação Em Engenharia Quí­mica pela Universidade Estadual de Maringá (2003) . Atualmente é Professor adjunto A da Universidade Estadual de Maringá. Tem experiência na área de Engenharia Quí­mica , com ênfase em Tecnologia Quí­mica. Atuando principalmente nos seguintes temas: cromo, troca iônica, Isotermas, leito fixo, Efluentes e curtume Currí­culo Lattes

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Published

2008-05-05

How to Cite

Tagami, L., Andreo dos Santos, O. A., Sousa-Aguiar, E. F., Arroyo, P. A., & Barros, M. A. S. D. de. (2008). NaY and CrY zeolites ion exchange. Thermodynamics. Acta Scientiarum. Technology, 23, 1351–1357. https://doi.org/10.4025/actascitechnol.v23i0.2761

Issue

Vol. 23 (2001)

Section

Chemical Engineering

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