RT Conference Proceedings
T1 Carbon materials as template for the preparation of mixed oxides with controlled morphology
A1 Cabrera-Molina, Antonio
A1 Valero-Romero, María José
A1 Guerrero-Pérez, María Olga
A1 Rodríguez-Mirasol, José
A1 Cordero-Alcántara, Tomás
K1 Ingeniería química
K1 Hidrocarburos
AB Bulk mixed oxide catalysts are widely used for many applications, such as catalysts forselective oxidation processes, electrocatalysts for fuel cells, gas sensors, and solid oxideelectrolysers for the production of hydrogen. VPO (vanadium and phosphorous oxides) areone of the bulk mixed oxide materials which are of interest nowadays since they are activecatalysts for saturated hydrocarbon activation. With the conventional synthesis proceduresfor preparing bulk mixed oxides is really difficult to control the morphology and theporous structure of these materials. In practice, there are just a few works about thesynthesis of mixed oxide materials with controlled morphology. The aim of this work wasto describe new approaches for the preparation of VPO mixed oxides materials withspherical morphology.A carbon material was prepared using cellulose as starting material by hydrothermaltreatment with phosphoric acid at 200ºC and carbonized at 500ºC. SEM analysis showedthat carbon spheres with diameter up to 0.5  m were prepared by this procedure. Thesephosphorous containing carbon material was impregnated with the appropriate amount ofvanadium oxide species in order to obtain a monolayer of VOx species on the surface ofthe carbon materials following a procedure described previously (1). By this manner, acarbon supported VOx material with spherical morphology was obtained (VPO/Csph). Thecalcination of this material was optimized in order to obtain VPO spheres with diameter upto 1-2  m and with BET area values close to 100 m2/g. Figure 1 shows a SEM image ofthis sample (VPOsph). The presence of vanadium pyrophosphate phase, which has beendescribed as the active phase of this catalytic system, was identified by XRD and Ramanspectroscopy. Thus, the chemical composition as well as the morphology and porousstructure of these new spherical materials makes them quite promising as catalysts.
YR 2013
FD 2013-06-18
LK http://hdl.handle.net/10630/5805
UL http://hdl.handle.net/10630/5805
LA eng
NO Resumen del libro de actas del Congreso: 5th Czech-Italian-Spanish Conference on Molecular Sieves and Catalysis, celebrado en Segovia del 16 al 19 de junio de 2013
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 25 ene 2026