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Sol-gel derived Pd supported TiO2-ZrO2 and TiO2 photocatalysts; their examination in photocatalytic reduction of carbon dioxide
Authors: Koci Kamila | Matejova Lenka | Reli Martin | Čapek Libor | Matejka Vlastimil | Lacny Zdenek | Kustrowski Piotr | Obalova Lucie
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Catalysis Today
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 20-26
Titles:
Language Name Abstract Keywords
cze Sol-gel příprava Pd na TiO2-ZrO2 a TiO2 fotokatalyzátorů; jejich testování ve p¨fotokatalytické redukci CO2 Čisté a Pd obsahující fotokatalyzátory na bázi TiO2 a TiO2-ZrO2 byly připraveny sol-gel metodou. připravené katalyzátory byly charakterizovány pomocí ICP MS, N2 fyzisorpce, XRD, UV-VIS a dalšími metodami. CO2; fotokatalýza; Pd; sol-gel; TiO2; ZrO2
eng Sol-gel derived Pd supported TiO2-ZrO2 and TiO2 photocatalysts; their examination in photocatalytic reduction of carbon dioxide Pure and palladium-enriched TiO2 and TiO2-ZrO2 photocatalysts were prepared by the sol-gel process controlled within reverse micelles and impregnated under vacuum. The catalysts were characterized by ICP MS, nitrogen physisorption, X-ray diffraction, UV-vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy and TEM/SEAD and investigated in the CO2 photocatalytic reduction in a batch annular photoreactor. Methane and hydrogen were the main reduction products in the gas phase. Low amounts of carbon monoxide were also detected. The observed order of product yields ( timolIg of a catalyst) was: H-2 > CH4 > CO. The catalyst performance (expressed as timol of products per grams of a photocatalyst) ranking was TiO2-ZrO2 > Pd/TiO2-ZrO2 > TiO2 > Pd/TiO2 > TiO2 Evonic P25. The detrimental effect of surface modification by Pd on the photocatalytic properties of both TiO2 and TiO2-ZrO2 photocatalysts can be explained by the presence of PdO clusters masking the supports surface and/or playing the role of the recombination centres. Carbon dioxide; Photocatalysis; Palladium; Sol gel; Titania; Zirconia

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