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Studying PW-Amberlite catalyst deactivation in limonene epoxidation by hydrogen peroxide
Estudio de la desactivación del catalizador PW-Amberlita en la epoxidación de limoneno con peróxido de hidrógeno
Keywords:
PW-Amberlita, estabilidad del catalizador, regeneración del catalizador, epoxidación de limoneno (en)PW-Amberlita, estabilidad del catalizador, regeneración del catalizador, epoxidación de limoneno (es)
The PW-Amberlite catalyst is active for limonene epoxidation in triphasic conditions; it becomes deactivated in reaction conditions. Catalyst stability during the reaction and recovery of catalyst activity when it was treated with several solvents were evaluated. It was found that the catalyst recovered 99% of its initial activity when it was washed with toluene and that the recovery was 95% and 97% when ethanol or acetone were used as washing solvents, respectively. Leaching tests showed that the reaction did not continue when the catalyst was removed from the reaction mixture, confirming the absence of leaching during the catalyst's active phase. FTIR analysis revealed that the characteristic species of the phosphotungstate complex did not vary with successive reusing of the catalyst.
El catalizador PW-Amberlita es activo para la epoxidación de limoneno en condiciones trifásicas, pero se desactiva durante la reacción. En esta contribución se evaluó la estabilidad del catalizador en la reacción y la recuperación de la actividad catalítica al tratarlo con varios solventes. Se encontró que el catalizador recupera el 99% de su actividad inicial cuando se lavó con tolueno y que la recuperación fue de 95 y 97% cuando se utilizaron etanol o acetona como solventes de lavado, respectivamente. Las pruebas de lixiviación mostraron que la reacción no continuaba al separar el catalizador de la mezcla de reacción, confirmando la ausencia de lixiviación de la fase activa del catalizador. Mediante análisis FTIR se evidenció que las especies características del complejo fosfotungstato no se modificaron con reutilizaciones sucesivas del catalizador.
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References
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Copyright (c) 2009 Rolando Barrera Zapata, Aída Luz Villa Holguín de P., Consuelo Montes de Correa
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