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RESEARCH PRODUCT

Enhanced (photo)catalytic activity of Wells-Dawson (H6P2W18O62) in comparison to Keggin (H3PW12O40) heteropolyacids for 2-propanol dehydration in gas-solid regime

Leonardo PalmisanoFrancesca Rita PomillaFrancesca Rita PomillaGiuseppe MarcìLeonarda F. LiottaElisa I. García-lópez

subject

Inorganic chemistry02 engineering and technologyActivation energy010402 general chemistry01 natural sciencesRedoxCatalysisCatalysiCatalysisPropeneReaction ratePropanolchemistry.chemical_compound2-Propanol dehydration Heteropolyacid Keggin Photocatalysis Polyoxometalate Wells-DawsonPhotocatalysiKegginWellsWells-Dawson2-Propanol dehydrationOrganic chemistryKegginPolyoxometalateProcess Chemistry and TechnologyHeteropolyacid021001 nanoscience & nanotechnology0104 chemical scienceschemistryPolyoxometalatePhotocatalysisSettore CHIM/07 - Fondamenti Chimici Delle TecnologieHeteropolyacid Polyoxometalate0210 nano-technologyphotocatalysis

description

Abstract Catalytic and photocatalytic 2-propanol dehydration to propene at atmospheric pressure and a temperature range of 60–120 °C were carried out in gas-solid regime by using bare and supported Keggin H 3 PW 12 O 40 (PW 12 ) and Wells-Dawson H 6 P 2 W 18 O 62 (P 2 W 18 ) heteropolyacids (HPAs). Binary materials were prepared by impregnation of the HPAs on commercial SiO 2 and TiO 2 . The Wells-Dawson was in any case more active than the Keggin heteropolyacid and the differences were enhanced when the supported samples were used. In particular, Wells-Dawson HPA supported on TiO 2 and under irradiation showed the highest activity. The HPA species played the key role both in the catalytic and photo-assisted reactions. The acidity of the cluster accounts for the catalytic role, whereas both the acidity and the redox properties of the HPA species were responsible for the increase of the reaction rate in the photo-assisted catalytic reaction. The estimated apparent activation energy resulted always lower for the photocatalytic process than for the catalytic one.

yearjournalcountryeditionlanguage
2016-11-01Applied Catalysis A: General
https://doi.org/10.1016/j.apcata.2016.10.002