Data/hora: 12/06/2024 12:33:59

Provedor de dados: | Anais da Academia Brasileira de Ciências
País: | Brazil
Título: | The promoting effect of cesium on structure and morphology of silver catalysts
Autores: | Carvalho,Marta C. N. A.; Perez,Carlos A.; Simão,Renata A.; Passos,Fabio B.; Schmal,Martin.
Data: | 2004-03-01
Ano: | 2004
Palavras-chave: | Silver; Cesium; Catalyst; AFM; XPS.
Resumo: | Silver supported catalysts on alpha-alumina were prepared and characterized by Brunauer-Emmet-Teller equations, scanning electronic microscopy, X-ray diffraction and atomic force microscopy techniques. Results show that these are powerful techniques for the determination of texture, morphology and surface properties. It has been shown that the addition of Cs in the Ag/Al2O3 catalyst increased the dispersion of silver with the formation of small silver particles over a thin silver film already formed over the alumina support. It is important to stress that atomic force microscopy measurements are significant to observe the film and the dispersion of Ag and, on the contrary, X-ray photoelectronic spectroscopy did not, however, it allows to the conclusion that undistinguishable silver, either as metallic or oxidation state, are present at the surface. X-ray diffraction results confirm predominantly metallic silver.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100003
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/S0001-37652004000100003
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.76 n.1 2004
Fonte: | info:eu-repo/semantics/openAccess