Preparation and characterization of lanthanum palygorskite clays as acid catalysts
Palygorskite clays containing 2, 4, 6 or 10% lanthanum (w/w) were prepared by ion-exchange from acid-leached natural clays. Samples were characterized by chemical and thermogravimetric analysis, X-ray diffraction, infrared spectroscopy, and N2 adsorption. Isopropyl alcohol was transformed in order t...
| Autores: | , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2002 |
| País: | Brasil |
| Recursos: | Universidade Federal do Rio Grande do Norte (UFRN) |
| Repositório: | Repositório Institucional da UFRN |
| Idioma: | inglês |
| OAI Identifier: | oai:repositorio.ufrn.br:123456789/31465 |
| Acesso em linha: | https://repositorio.ufrn.br/handle/123456789/31465 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Lanthanum Palygorskite Mineral clays Characterization |
| Resumo: | Palygorskite clays containing 2, 4, 6 or 10% lanthanum (w/w) were prepared by ion-exchange from acid-leached natural clays. Samples were characterized by chemical and thermogravimetric analysis, X-ray diffraction, infrared spectroscopy, and N2 adsorption. Isopropyl alcohol was transformed in order to improve the acid behavior of the material. The introduction of La3+ did not change the structure of the palygorskite. Surface areas as high as 177.6 m2 g−1 were measured for catalysts containing 2% lanthanum. This material also showed a very good activity for alcohol dehydration |
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