|
|||||
|
|
Acidic Characterization of Copper Oxide and Niobium Pentoxide Supported on Silica–Alumina |
|
| Authors: | Fillipe A C Garcia Valdeilson S Braga Júnia C M Silva José A Dias Sílvia C L Dias Jorge L B Davo |
| Affiliation: | 1. Laboratório de Catálise, Instituto de Química, Universidade de Brasília, caixa postal 4478, Brasília, DF, 70904-970, Brazil 2. Instituto de Ciências Ambientais e Desenvolvimento Sustentável (ICADS), Universidade Federal da Bahia (UFBA), Rua Professor José Seabra S/N, Barreiras, BA, 47805-100, Brazil 3. Technology Center CBMM-Companhia Brasileira de Metalurgia e Minera??o, Córrego da Mata, s/n, Araxa, MG, 38183-903, Brazil |
| 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 Brönsted, 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 Brönsted and Lewis sites (ΔH1 = ?107.5 and ΔH2 = ?64.4 kJ mol?1, respectively). |
| Keywords: | Copper oxide Niobium pentoxide Liquid phase microcalorimetry Acidic characterization Supported catalyst |
| 本文献已被 SpringerLink 等数据库收录！ | |