@prefix prodottidellaricerca: . @prefix istituto: . @prefix prodotto: . istituto:CDS054 prodottidellaricerca:prodotto prodotto:ID33627 . @prefix rdf: . @prefix retescientifica: . prodotto:ID33627 rdf:type retescientifica:ProdottoDellaRicerca , prodotto:TIPO1101 . @prefix rdfs: . prodotto:ID33627 rdfs:label "Laal1-xcrxo3 perovskite-type solid solutions: Structural, electronic, magnetic properties and catalytic activity towards CO oxidation. (Articolo in rivista)"@en . @prefix xsd: . @prefix pubblicazioni: . prodotto:ID33627 pubblicazioni:anno "2002-01-01T00:00:00+01:00"^^xsd:gYear . @prefix skos: . prodotto:ID33627 skos:altLabel "
Cordischi D., De Rossi S., Faticanti M., Minelli G., Porta P.. (2002)
Laal1-xcrxo3 perovskite-type solid solutions: Structural, electronic, magnetic properties and catalytic activity towards CO oxidation.
in PCCP. Physical chemistry chemical physics (Print)
"^^rdf:HTML ; pubblicazioni:autori "Cordischi D., De Rossi S., Faticanti M., Minelli G., Porta P.."^^xsd:string ; pubblicazioni:paginaInizio "3085"^^xsd:string ; pubblicazioni:paginaFine "3090"^^xsd:string ; pubblicazioni:numeroVolume "4"^^xsd:string . @prefix ns9: . prodotto:ID33627 pubblicazioni:rivista ns9:ID163631 ; skos:note "ISI Web of Science (WOS)"^^xsd:string ; pubblicazioni:titolo "Laal1-xcrxo3 perovskite-type solid solutions: Structural, electronic, magnetic properties and catalytic activity towards CO oxidation."^^xsd:string ; prodottidellaricerca:abstract "Perovskite-type LaAl1-xCrxO3 samples were prepared from citrate precursors \nand calcined at several temperatures up to 1073 K. The materials were \ncharacterized by XRD, diffuse reflectance spectroscopy (DRS), EPR and \nmagnetic susceptibility measurements. At 773 K all samples are amorphous, \nat 923 K the perovskite structure starts to form in addition to other La-\nCr oxides such as LaCrO4 and La2CrO6, whereas at 1073 K all samples are \nsingle phase LaAl1-xCrxO3 perovskite-type solid solutions. EPR analysis \nconfirmed the presence of both Cr3+ and Cr5+ in the materials fired at 923 \nK. DRS patterns, magnetic susceptibility measurements and EPR analysis \nconfirmed the presence of Cr3+ alone in all the perovskite-type solid \nsolutions obtained at 1073 K. For these samples: (i) the particle sizes \nand surface areas are in the 610 to >1000 A and 3-7 m2 g-1 ranges, \nrespectively; (ii) a linear increase of the unit cell volume, V, with x \nwas observed, in agreement with expectations based on the ionic size of \ninterchanging Al3+ and Cr3+ ions. The perovskite samples calcined at 1073 \nK were tested for CO oxidation. All Cr-containing materials are much more \nactive than LaAlO3 pointing to the essential role of the transition metal \nion in developing highly active catalysts. The activity trend and the \nvariation of the activation energy with the increase in Cr content suggest \na change in the active site from mononuclear to polynuclear." ; prodottidellaricerca:prodottoDi istituto:CDS054 . ns9:ID163631 pubblicazioni:rivistaDi prodotto:ID33627 .