A comparison between photocatalytic and catalytic oxidation of 2-Propanol over Au/TiO2-CeO2 catalysts

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RESEARCH PRODUCT

A comparison between photocatalytic and catalytic oxidation of 2-Propanol over Au/TiO2-CeO2 catalysts

Salvatore Scirè Roberto Fiorenza Marianna Bellardita Leonardo Palmisano

subject

Cerium oxide Inorganic chemistry Oxide Catalytic combustion 02 engineering and technology 010402 general chemistry Catalytic combustion 01 natural sciences Catalysis Catalysis Catalysi chemistry.chemical_compound Photocatalysi Physical and Theoretical Chemistry Chemistry Process Chemistry and Technology Cerium oxide 021001 nanoscience & nanotechnology 0104 chemical sciences Catalytic oxidation Titanium dioxide Photocatalysis Titanium dioxide Selective oxidation Gold Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie 0210 nano-technology BET theory

description

Abstract Photocatalytic and catalytic oxidation of 2-propanol, representative of volatile organic compounds (VOC’s), were compared over mixed TiO 2 –CeO 2 -based catalysts. The effect of different amounts of CeO 2 and the presence of gold (1 wt%) on TiO 2 was investigated. In the photocatalytic oxidation CeO 2 had a negative effect on the performance towards the alcohol conversion of both TiO 2 –CeO 2 and Au/TiO 2 –CeO 2 catalysts, being Au/TiO 2 the most active system. On the contrary mixed TiO 2 –CeO 2 and Au/TiO 2 –CeO 2 samples showed a higher catalytic oxidation efficiency for 2-propanol conversion compared to the single oxides. In this case Au/CeO 2 catalyst had the best performance. On the basis of characterization data (XRD, Raman spectroscopy, EDX, BET Surface area determinations, H 2 -TPR, DRIFT and DRS), it was proposed that the interaction of gold with TiO 2 caused an enhancement of the partial photo-oxidation activity to acetone due to an increase of the charge separation between the excited electron and the hole of TiO 2 , whereas the coexistence of gold and both TiO 2 and CeO 2 oxides favoured the total oxidation of the alcohol to CO 2 . The catalytic oxidation of 2-propanol is, instead, mainly directed by the presence of a reducible oxide support as CeO 2 , necessary to enable a strong interaction with gold nanoparticles, providing very active lattice oxygen atoms.

year	journal	country	edition	language
2016-05-01

10.1016/j.molcata.2016.01.025 http://hdl.handle.net/10447/177180