caa a22 4500 463252136 CHVBK 20180405153343.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10562-007-9204-8 doi (NATIONALLICENCE)springer-10.1007/s10562-007-9204-8 Acidic Characterization of Copper Oxide and Niobium Pentoxide Supported on Silica-Alumina [Elektronische Daten] [Fillipe Garcia, Valdeilson Braga, Júnia Silva, José Dias, Sílvia Dias, Jorge Davo] 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% (∼308m2g−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 (0.38mmol g−1) and enthalpies of interaction with pyridine for Brönsted and Lewis sites (ΔH1=−107.5 and ΔH2=−64.4kJ mol−1, respectively). Springer Science+Business Media, LLC, 2007 Copper oxide nationallicence Niobium pentoxide nationallicence Liquid phase microcalorimetry nationallicence Acidic characterization nationallicence Supported catalyst nationallicence Garcia Fillipe Laboratório de Catálise, Instituto de Química, Universidade de Brasília, caixa postal 4478, 70904-970, Brasília, DF, Brazil aut Braga Valdeilson Instituto de Ciências Ambientais e Desenvolvimento Sustentável (ICADS), Universidade Federal da Bahia (UFBA), Rua Professor José Seabra S/N, 47805-100, Barreiras, BA, Brazil aut Silva Júnia Laboratório de Catálise, Instituto de Química, Universidade de Brasília, caixa postal 4478, 70904-970, Brasília, DF, Brazil aut Dias José Laboratório de Catálise, Instituto de Química, Universidade de Brasília, caixa postal 4478, 70904-970, Brasília, DF, Brazil aut Dias Sílvia Laboratório de Catálise, Instituto de Química, Universidade de Brasília, caixa postal 4478, 70904-970, Brasília, DF, Brazil aut Davo Jorge Technology Center CBMM-Companhia Brasileira de Metalurgia e Mineração, Córrego da Mata, s/n, 38183-903, Araxa, MG, Brazil aut Catalysis Letters Springer US; http://www.springer-ny.com 119/1-2(2007-11-01), 101-107 1011-372X 119:1-2<101 2007 119 10562 https://doi.org/10.1007/s10562-007-9204-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10562-007-9204-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Garcia Fillipe Laboratório de Catálise, Instituto de Química, Universidade de Brasília, caixa postal 4478, 70904-970, Brasília, DF, Brazil aut NATIONALLICENCE 700 1- Braga Valdeilson Instituto de Ciências Ambientais e Desenvolvimento Sustentável (ICADS), Universidade Federal da Bahia (UFBA), Rua Professor José Seabra S/N, 47805-100, Barreiras, BA, Brazil aut NATIONALLICENCE 700 1- Silva Júnia Laboratório de Catálise, Instituto de Química, Universidade de Brasília, caixa postal 4478, 70904-970, Brasília, DF, Brazil aut NATIONALLICENCE 700 1- Dias José Laboratório de Catálise, Instituto de Química, Universidade de Brasília, caixa postal 4478, 70904-970, Brasília, DF, Brazil aut NATIONALLICENCE 700 1- Dias Sílvia Laboratório de Catálise, Instituto de Química, Universidade de Brasília, caixa postal 4478, 70904-970, Brasília, DF, Brazil aut NATIONALLICENCE 700 1- Davo Jorge Technology Center CBMM-Companhia Brasileira de Metalurgia e Mineração, Córrego da Mata, s/n, 38183-903, Araxa, MG, Brazil aut NATIONALLICENCE 773 0- Catalysis Letters Springer US; http://www.springer-ny.com 119/1-2(2007-11-01), 101-107 1011-372X 119:1-2<101 2007 119 10562 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer