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Intercambio iónico a alta presión y temperatura del aluminosilicato y el galosilicato de natrolito
Gemma L Hill1, Edward Bailey, Martin C Stennett
1School of Chemistry, University of Birmingham, Edgbaston, UK.
Journal of the American Chemical Society
|August 9, 2011
Resumen
La alta presión y temperatura permiten el intercambio directo de iones en las zeolitas, creando nuevas formas catiónicas. Este método atrapa a los cationes de cesio más grandes dentro de la estructura de la zeolita natrolita.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La geoquímica es la geoquímica.
- Física mineral Física de los minerales
Sus antecedentes:
- Las zeolitas son minerales microporosos de aluminosilicato con importantes aplicaciones industriales.
- El intercambio iónico en las zeolitas generalmente implica pequeños cationes debido a limitaciones en el tamaño de los poros.
- La natrolita es un marco específico de zeolita conocido por su estructura de canal.
Objetivo del estudio:
- Investigar la viabilidad del intercambio iónico directo de cationes grandes en estructuras de zeolita.
- Explorar el uso de alta presión y temperatura para superar las limitaciones de tamaño catiónico.
- Para sintetizar nuevas formas catiónicas de zeolitas.
Principales métodos:
- Aplicación simultánea de alta presión y alta temperatura a la zeolita natrolita.
- Inducir un estado superhidratado en la natrolita para aumentar las dimensiones de los poros.
- Realización de intercambio directo de iones con grandes cationes de cesio por cationes de sodio.
Principales resultados:
- Exitoso intercambio directo de iones de grandes cationes de cesio por pequeños cationes de sodio en la natrolita.
- El marco de zeolita mantuvo la integridad estructural bajo alta presión y temperatura.
- Los cationes más grandes quedaron efectivamente atrapados dentro de los poros de la zeolita al liberarse la presión.
Conclusiones:
- La alta presión y la alta temperatura simultáneas es un método eficaz para sintetizar nuevas formas catiónicas de zeolita.
- Esta técnica supera las limitaciones de tamaño típicamente encontradas en el intercambio iónico de zeolita.
- Los materiales resultantes representan nuevas composiciones de zeolita con potencial para nuevas aplicaciones.
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