[article] 
inIndustrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5666–5670

Titre :	Preferential oxidation of CO in H2 stream on Au/TiO2 catalysts : effect of preparation method
Type de document :	texte imprimé
Auteurs :	Palanivelu Sangeetha, Auteur ; Li-Hsin Chang, Auteur ; Chen, Yu-Wen, Auteur
Année de publication :	2009
Article en page(s) :	pp. 5666–5670
Note générale :	Chemical engineering
Langues :	Anglais (eng)
Mots-clés :	Au/TiO2 catalysts Deposition-precipitation methods Inductively coupled plasma-mass spectrometry X-ray diffraction Transmission electron microscopy photoelectron spectroscopy
Résumé :	A series of Au/TiO2 catalysts were prepared by either photodeposition or deposition−precipitation methods. The catalysts were characterized by inductively coupled plasma-mass spectrometry (ICP-MS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The catalytic performance of these catalysts was investigated by preferential oxidation of carbon monoxide in a hydrogen stream. A high gold dispersion and narrow size distribution was obtained for Au/TiO2 catalysts prepared by both photodeposition or deposition−precipitation methods. The photodeposition method facilitates the preparation of gold particles as small as 1.5 nm on the support, whereas in the deposition−precipitation method, the gold particles were found to be around 2−3 nm. The catalyst prepared by the photodeposition method showed higher CO conversion and CO selectivity than those prepared by the deposition−precipitation method. The selectivity of CO reacting with O2 decreased with increasing reaction temperature due to H2 competing with CO at high temperatures. Au/TiO2 catalysts prepared by the photodeposition method showed relatively higher CO selectivity below 65 °C when compared with the deposition−precipitation method. The differences in activity could be attributed to the difference in chemical state of gold particles and the particle size of gold. The catalyst prepared by photodeposition had a smaller particle size (1.5 nm). It had higher CO conversion at low temperature (
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie900403s

[article] Preferential oxidation of CO in H2 stream on Au/TiO2 catalysts : effect of preparation method [texte imprimé] / Palanivelu Sangeetha, Auteur ; Li-Hsin Chang, Auteur ; Chen, Yu-Wen, Auteur . - 2009 . - pp. 5666–5670.
Chemical engineering
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5666–5670

Mots-clés :	Au/TiO2 catalysts Deposition-precipitation methods Inductively coupled plasma-mass spectrometry X-ray diffraction Transmission electron microscopy photoelectron spectroscopy
Résumé :	A series of Au/TiO2 catalysts were prepared by either photodeposition or deposition−precipitation methods. The catalysts were characterized by inductively coupled plasma-mass spectrometry (ICP-MS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The catalytic performance of these catalysts was investigated by preferential oxidation of carbon monoxide in a hydrogen stream. A high gold dispersion and narrow size distribution was obtained for Au/TiO2 catalysts prepared by both photodeposition or deposition−precipitation methods. The photodeposition method facilitates the preparation of gold particles as small as 1.5 nm on the support, whereas in the deposition−precipitation method, the gold particles were found to be around 2−3 nm. The catalyst prepared by the photodeposition method showed higher CO conversion and CO selectivity than those prepared by the deposition−precipitation method. The selectivity of CO reacting with O2 decreased with increasing reaction temperature due to H2 competing with CO at high temperatures. Au/TiO2 catalysts prepared by the photodeposition method showed relatively higher CO selectivity below 65 °C when compared with the deposition−precipitation method. The differences in activity could be attributed to the difference in chemical state of gold particles and the particle size of gold. The catalyst prepared by photodeposition had a smaller particle size (1.5 nm). It had higher CO conversion at low temperature (
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie900403s