V/Sn/O mixed oxides were prepared by solid state reaction at 700C between tin oxohydrates and vanadium pentoxide. The resulting material contained different vanadium species: i) V4Plus; in a VxSn1-xO2-type solid solution, where vanadium ions replaced tin in the rutile lattice, ii) amorphous V5+ oxide spread over the solid solution, and iii) crystalline V2O5. The mixed oxides were tested as catalysts for the oxidative dehydrogenation of ethane. The reaction network was found to consist of parallel reactions for ethylene, CO and CO2 formation; consecutive reactions of ethylene and CO overoxidation also occurred. Increasing amounts of V4+ in the solid solution increased the SnO2 activity in ethane conversion. The selectivity to ethylene also was affected by the value of x. For x<0.02 the selectivity was greater than that of pure SnO2, while higher values lowered the selectivity. Independent of the value of x, hawever, the selectivity at 500C was close to 40%, higher than that obtained with SnO2. The V5+ oxide was instead detrimental for selectivity, because its presence led to the oxidation of ethane to CO. © 1994 Elsevier Science B.V.
Dispersion of V4+ ions in a SnO2 rutile matrix as a tool for the creation of active sites in ethane oxydehydrogenation / Bordoni S.; Castellani F.; Cavani F.; Trifiro F.; Kulkarni M.P.. - STAMPA. - (1994), pp. 93-102. (Intervento presentato al convegno Oxidation Catalysis tenutosi a Milano nel giugno 1994) [10.1016/S0167-2991(08)63401-1].
Dispersion of V4+ ions in a SnO2 rutile matrix as a tool for the creation of active sites in ethane oxydehydrogenation
Bordoni S.Investigation
;Cavani F.Methodology
;
1994
Abstract
V/Sn/O mixed oxides were prepared by solid state reaction at 700C between tin oxohydrates and vanadium pentoxide. The resulting material contained different vanadium species: i) V4Plus; in a VxSn1-xO2-type solid solution, where vanadium ions replaced tin in the rutile lattice, ii) amorphous V5+ oxide spread over the solid solution, and iii) crystalline V2O5. The mixed oxides were tested as catalysts for the oxidative dehydrogenation of ethane. The reaction network was found to consist of parallel reactions for ethylene, CO and CO2 formation; consecutive reactions of ethylene and CO overoxidation also occurred. Increasing amounts of V4+ in the solid solution increased the SnO2 activity in ethane conversion. The selectivity to ethylene also was affected by the value of x. For x<0.02 the selectivity was greater than that of pure SnO2, while higher values lowered the selectivity. Independent of the value of x, hawever, the selectivity at 500C was close to 40%, higher than that obtained with SnO2. The V5+ oxide was instead detrimental for selectivity, because its presence led to the oxidation of ethane to CO. © 1994 Elsevier Science B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
