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Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route
Published on: April 3, 2016
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SSZ-87: una zeolita de borosilicato con aberturas de poro de 10 anillos inusualmente flexibles
Stef Smeets1, Lynne B McCusker, Christian Baerlocher
1Laboratory of Crystallography, ETH Zurich , Vladimir-Prelog-Weg 5, Zurich CH-8093, Switzerland.
Journal of the American Chemical Society
|January 22, 2015
Resumen
La estructura cristalina de la zeolita de borosilicato SSZ-87 se determinó mediante difracción de polvo de rayos X y difracción de electrones de rotación. Su estructura de poro única, con grandes jaulas unidas por 10 anillos, se reveló después de la calcinación y la inserción de aluminio.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La cristalografía es una técnica de cristalografía.
- La catálisis de la catálisis.
Sus antecedentes:
- Las zeolitas son materiales microporosos cruciales utilizados en la catálisis y la separación.
- Comprender las estructuras de la zeolita es clave para optimizar su rendimiento.
- Las propiedades estructurales y las aplicaciones potenciales de la zeolita de borosilicato SSZ-87 requieren una investigación detallada.
Objetivo del estudio:
- Para dilucidar la estructura cristalina detallada de la zeolita de borosilicato SSZ-87. sintetizado como SSZ-87. para clarificar la estructura cristalina detallada de la zeolita de borosilicato SSZ-87. para clarificar la estructura cristalina detallada de la zeolita de borosilicato SSZ-87.
- Investigar los cambios estructurales en el SSZ-87 tras la calcinación y la inserción de aluminio.
- Para correlacionar la estructura determinada con las propiedades catalíticas observadas.
Principales métodos:
- Difracción de polvo de rayos X de alta resolución (XPD) para la determinación de células unitarias y grupos espaciales.
- Difracción de electrones de rotación (RED) para la solución de la estructura inicial.
- Análisis de la estructura después de la calcinación y la inserción de aluminio para observar las transformaciones del material.
Principales resultados:
- La topología marco de SSZ-87 fue identificada como la misma que ITQ-52 (IFW).
- Se determinaron las ubicaciones del agente de dirección de la estructura (SDA) y los átomos de boro en el material sintetizado.
- La calcinación condujo a la desboronación parcial, y la posterior inserción de aluminio dio como resultado un material libre de boro y libre de defectos con un sistema de poros más flexible.
Conclusiones:
- SSZ-87 posee una estructura única con grandes jaulas interconectadas por 10 anillos.
- La flexibilidad del sistema de poros del material aumenta con la calcinación y la inserción de aluminio, atribuida a ventanas y huecos de 10 anillos individuales.
- Los conocimientos estructurales proporcionan una base para comprender y mejorar el rendimiento del SSZ-87 en aplicaciones catalíticas.
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