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La síntesis ionotérmica de cobalto aluminophosphate zeolita marco de trabajo de las estructuras
Emily R Parnham1, Russell E Morris
1EaStChem School of Chemistry, University of St. Andrews, Purdie Building, St. Andrews, KY16 9ST U.K.
Journal of the American Chemical Society
|February 16, 2006
Resumen
Las zeolitas de aluminofosfato de cobalto se sintetizaron utilizando métodos ionotérmicos. Se descubrió una nueva estructura de zeolita, SIZ-7, que muestra una distribución desigual de cobalto dentro de su marco.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- La cristalografía es una técnica de cristalografía.
Sus antecedentes:
- Las zeolitas son materiales microporosos cruciales con aplicaciones en catálisis y separación.
- Las zeolitas que contienen cobalto son de interés por sus propiedades catalíticas.
- La síntesis ionotérmica ofrece una ruta única para la fabricación de zeolita.
Objetivo del estudio:
- Para sintetizar nuevas zeolitas de cobalto aluminofosfato utilizando métodos ionotérmicos.
- Para caracterizar la estructura y las propiedades de los materiales sintetizados.
- Para investigar la distribución del cobalto dentro del marco de la zeolita.
Principales métodos:
- Síntesis ionotérmica que utiliza líquidos iónicos como disolvente y agente direccionador de la estructura.
- Difracción de rayos X en polvo para la identificación de fase.
- Difracción de rayos X monocristalino para el análisis estructural detallado.
Principales resultados:
- Se sintetizaron con éxito tres zeolitas de aluminofosfato de cobalto distintas.
- Se identificaron dos zeolitas como isostruturales con marcos conocidos de AEI y SOD.
- Se descubrió una nueva estructura de zeolita, SIZ-7, relacionada con las familias de zeolita de 8 anillos (MER, GIS, PHI).
- La difracción de rayos X de un solo cristal reveló una distribución desigual de cobalto a través de sitios tetraédricos en SIZ-7.
Conclusiones:
- La síntesis ionotérmica es efectiva para la creación de zeolitas de aluminofosfato de cobalto.
- El descubrimiento de SIZ-7 amplía la familia de las zeolitas de 8 anillos.
- La desigual distribución de cobalto en la SIZ-7 puede influir en su rendimiento catalítico.
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