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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/4849

Title: Acidic Characterization of Copper Oxide and Niobium Pentoxide Supported on Silica–Alumina
Other Titles: Catalysis Letters
Authors: Garcia, Fillipe Augusto da Costa
Braga, Valdeilson Souza
Dias, José Alves
Silva, Júnia Chaves Marinho e
Dias, Sílvia Cláudia Loureiro
Davo, Jorge L. B.
Keywords: Copper oxide;Niobium pentoxide;Liquid phase microcalorimetry;Acidic characterization;Supported catalyst
Issue Date: 2007
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).
Description: p.101–107
URI: http://www.repositorio.ufba.br/ri/handle/ri/4849
ISSN: 1572-879X
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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