Preparação e propriedades de zeólitas faujasita contendo cátions amônio
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Data
2010
Autores
Almeida, Karina Arruda
Martins, Leandro [UNESP]
Cardoso, Dilson
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Química
Resumo
Sodium faujasite zeolites with Si/Al ratio of 1.4 and 2.5 were exchanged with methylammonium cations. The influence of framework aluminum and ion exchange degree in their basic properties were evaluated. These properties were assessed in the Knoevenagel catalytic condensation. The sodium ion exchange was restricted to the supercavity and the exchange degree depended on the cation volume and on the Si/Al ratio. The higher catalytic activity is achieved for the zeolite with the lower Si/Al ratio exchanged with the monomethylammonium cation. The best performance of this catalyst is attributed to the higher basicity in combination with elevated micropore volume.
Descrição
Palavras-chave
faujasite zeólitas, basic catalyst, methylammonium cations
Como citar
Química Nova. Sociedade Brasileira de Química, v. 33, n. 5, p. 1077-1081, 2010.