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Photocatalytic Hydrogen Formation from Ammonia in an Aqueous Solution Over Pt-Enriched TiO2-ZrO2 Photocatalyst
Authors: Šihor Marcel | Kočí Kamila | Matějová Lenka | Reli Martin | Ambrožová Nela | Pavlovský Jiří | Čapek Libor | Obalová Lucie
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Journal of Nanoscience and Nanotechnology
Publisher name: American Scientific Publishers
Place: Valencia
Page from-to: 6833-6839
Titles:
Language Name Abstract Keywords
cze Fotokatalytická tvorba vodíku z amoniaku ve vodném roztoku pomocí Pt-TiO2-ZrO2 fotokatalyzátoru Cílem studie bylo odstranění amoniaku z vodných roztoků pomocí jeho rozkladu na vodík a dusík působením ultrafialového světla. K rozkladu byl použit katalyzátor na bázi Pt nanesené na TiO2-ZrO2, který je perspektivní pro fotokatalýzu. fotokatalýza; TiO2-ZrO2; Ptr; nanočástice; fotokatalytický rozklad amoniaku
eng Photocatalytic Hydrogen Formation from Ammonia in an Aqueous Solution Over Pt-Enriched TiO2-ZrO2 Photocatalyst The aim of this study was to remove ammonia from an aqueous solution by its decomposition to valuable products such as H-2 and harmless N-2 under UV light. The decomposition of ammonia by photocatalytic process represents an emerging and interesting way of its removal since beside the need of its reduction from the drinking and wastewaters with the respect to its negative impact on human and mammals health, it can lead to generation of hydrogen as an alternative fuel. A laboratory-synthesized Pt/TiO2 ZrO2 photocatalyst was studied and its photocatalytic activity was compared with the activity of commercial TiO2 Evonik P25. The PtfTiO(2) ZrO2 photocatalyst was prepared by combining a sol gel process controlled within reverse micelles of nonionic surfactant Triton X-114 in cyclohexane, impregnation under vacuum and calcination. Explored photocatalysts were characterized by organic elementary analysis, nitrogen physisorption, XRD, FESEM and UVVis spectroscopy. The real platinum content in the Pt/TiO2 ZrO2 photocatalyst was determined by ICP-MS. The photocatalytic decomposition of ammonia was investigated in the time range of 0-12 h. During the first two hours the generation of hydrogen was almost negligible. The generation of hydrogen increased after 4 h of irradiation. Based on time dependences of ammonia decomposition the kinetic rate constants for Pt/TiO2 ZrO2 and TiO2 Evonik P25 photocatalysts were calculated. The ammonia photocatalytic decomposition was described well by the first order kinetic equation. The photocatalytic ammonia decomposition over the platinized TiO2 ZrO2 photocatalyst was proving 2 times higher photocatalytic performance than Evonik P25 (1241 mu mol/g(cat) and 665 mu mol/g(cat), respectively). Photocatalysis; TiO2-ZrO2; Platinum; Nanoparticles; Ammonia Photocatalytic Decomposition

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