https://repositorio.ufba.br/handle/ri/4849
Tipo: | Artigo de Periódico |
Título: | Acidic Characterization of Copper Oxide and Niobium Pentoxide Supported on Silica–Alumina |
Título(s) alternativo(s): | Catalysis Letters |
Autor(es): | Garcia, Fillipe Augusto da Costa Braga, Valdeilson Souza Dias, José Alves Silva, Júnia Chaves Marinho e Dias, Sílvia Cláudia Loureiro Davo, Jorge L. B. |
Autor(es): | Garcia, Fillipe Augusto da Costa Braga, Valdeilson Souza Dias, José Alves Silva, Júnia Chaves Marinho e Dias, Sílvia Cláudia Loureiro Davo, Jorge L. B. |
Abstract: | Copper oxide and niobium pentoxide were supported on silica–alumina with 2, 5, 10, 15 and 25 mass% loadings and 1:1 mass ratio of CuO:Nb2O5. XRD and BET measurements confirmed that monolayer coverage is reached with loadings between 5–10 mass%(~308 m2 g–1). The DRIFTS spectra of pyridine adsorbed catalysts showed bands associated with Bro¨nsted, Lewis and a combination of both acidic sites. Thermal analysis and liquid phase microcalorimetry provided the parameters for the best catalyst (10 mass%), which has the highest number of acidic sites (0.38 mmol g–1) and enthalpies of interaction with pyridine for Bro¨nsted and Lewis sites (DH1 = –107.5 and DH2 = –64.4 kJ mol–1, respectively). |
Palavras-chave: | Copper oxide Niobium pentoxide Liquid phase microcalorimetry Acidic characterization Supported catalyst |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/4849 |
Data do documento: | 2007 |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
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