Synthesis and characterisation of sod-, can-and jbw-type structures by hydrothermal reaction of kaolinite at 200oc
Low-silica zeolitic materials like SOD, CAN and JBW crystallized after hydrothermal transformation of kaolinite in the system Na₂O–Al₂O₃–SiO₂–H₂O at 200oC, with or without the addition of a structure-directing agent. The synthesis products were characterized by XRD, SEM, FTIR, ²⁹Si and ²⁷Al MAS-NMR...
- Autores:
-
Ríos Reyes, Carlos Alberto
Denver Williams, Craig
Roberts, Clive
- Tipo de recurso:
- Article of journal
- Fecha de publicación:
- 2011
- Institución:
- Universidad Nacional de Colombia
- Repositorio:
- Universidad Nacional de Colombia
- Idioma:
- spa
- OAI Identifier:
- oai:repositorio.unal.edu.co:unal/37735
- Acceso en línea:
- https://repositorio.unal.edu.co/handle/unal/37735
http://bdigital.unal.edu.co/27819/
- Palabra clave:
- Low-silica zeolitic materials
hydrothermal
synthesis
kaolinite
dissolution
- Rights
- openAccess
- License
- Atribución-NoComercial 4.0 Internacional
| Summary: | Low-silica zeolitic materials like SOD, CAN and JBW crystallized after hydrothermal transformation of kaolinite in the system Na₂O–Al₂O₃–SiO₂–H₂O at 200oC, with or without the addition of a structure-directing agent. The synthesis products were characterized by XRD, SEM, FTIR, ²⁹Si and ²⁷Al MAS-NMR and TGA. After dissolution of kaolinite in alkaline medium, co-crystallization of SOD and CAN, likely via a metastable LTA intermediate, was followed by a transformation to JBW-type structure. |
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