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Novel cerium doped titania catalysts for photocatalytic decomposition of ammonia
Authors: Reli Martin | Ambrožová Nela | Šihor Marcel | Matějová Lenka | Čapek Libor | Obalová Lucie | Matěj Zdeněk | Kotarba Andrzej | Kočí Kamila
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Applied catalysis B: Enviromental
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 108-116
Titles:
Language Name Abstract Keywords
cze Nové cérem dopované katalyzátory na bázi titanu pro fotokatalytický rozklad amoniaku Čisté TiO2 a ceriem dopované TiO2 fotokatalyzátory byly připraveny pomocí sol-gel metody v roztoku reverzních micel neiontoveho surfaktantu Triton X-114 v cyklohexanu. Textura, strukturní, mikrostrukturní, optické a elektronické vlastnosti fotokatalyzátorů byly stanoveny pomocí fyzisorpce dusíku, XRD, DR UV-VIS. Bylo zjištěno, že zvýšení množství iontů Ce v TiO2 vede k poklesu velikosti krystalitů anatasu, a tedy k vzrůstu specifického povrchu katalyzátoru. cér; TiO2; nanočástice; fotokatalýza; rozklad amoniaku
eng Novel cerium doped titania catalysts for photocatalytic decomposition of ammonia Parent TiO2 and cerium doped TiO2 photocatalysts (with cerium loadings in the range 0.6-1.4 wt.%) were prepared by using the sol-gel method controlled within reverse micelles of nonionic surfactant Triton X-114 in cyclohexane. Textural, structural, microstructural, optical and electronic properties of photocatalysts were characterized in detail by using nitrogen physisorption, powder X-ray diffraction, diffuse reflectance UV-vis spectroscopy and contact potential difference measurements. It was proved that increasing amount of cerium ions in TiO2 decreases the anatase crystallites size, which corresponded to the increase of specific surface area of the catalysts. The shift of spectral response of cerium doped catalysts to the visible light region was also observed, the significant decrease of absorption edge of photocatalysts with increasing Ce loading within 0.6-1.4 wt.% was detected. The photocatalytic decomposition of ammonia was carried out in a stirred batch annular reactor and the main product was hydrogen. The energetics of the TiO2 photocatalysts, which were crucially affected by the doping with Ce ions, play the key role in the ammonia photocatalytic decomposition. Cerium TiO2 nanoparticles; Photocatalysis; Ammonia decomposition

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