Au/CuOx-TiO2 catalysts for preferential oxidation of CO in hydrogen sStream / Palanivelu Sangeetha in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2096–2102 Titre : Au/CuOx-TiO2 catalysts for preferential oxidation of CO in hydrogen sStream Type de document : texte imprimé Auteurs : Palanivelu Sangeetha, Auteur ; Bin Zhao, Auteur ; Chen, Yu-Wen, Auteur Année de publication : 2010 Article en page(s) : pp. 2096–2102 Note générale : Industrial Chemisty Langues : Anglais (eng) Mots-clés : Catalysts  Au/CuOx-TiO2  Preferential Oxidation Résumé : A series of Au/CuOx−TiO2 catalysts with various Cu/Ti atomic ratios were prepared by deposition−precipitation method. The catalysts were characterized by inductively coupled plasma−mass spectrometry, X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The preferential oxidation of CO in H2 stream (PROX) on these catalysts was carried out in a fixed bed microreactor with a gas mixture (CO:O2:H2:He = 1.33:1.33:65.33:32.01 by volume ratios) was fed with a space velocity of 30000 mL/(g·h). Au/CuOx−TiO2 with various Cu/Ti atomic ratios showed similar gold particle size (2.3−2.5 nm). The gold in the starting material was almost totally loaded on the CuOx−TiO2 support at pH = 7. Au/CuOx−TiO2 catalysts with gold content of 1 wt % and calcined at 180 °C had superior catalytic activity and selectivity for CO oxidation at temperature of 80 °C. Au/CuOx−TiO2 (Cu/Ti = 4.8/95.2) had a CO conversion of 100% at 80 °C, and CO selectivity reaches 68%. Gold particles were well dispersed and stable on the support. Even after PROX reaction at 80 °C for a long time, most of the particles still maintained at 2.4 nm. The CO conversion slightly decreased from 100% to 95%, and CO selectivity was nearly the same. Au/CuOx−TiO2 is a highly effective and thermally stable catalyst for PROX reaction compared with Au/TiO2 catalyst. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901233e [article] Au/CuOx-TiO2 catalysts for preferential oxidation of CO in hydrogen sStream [texte imprimé] / Palanivelu Sangeetha, Auteur ; Bin Zhao, Auteur ; Chen, Yu-Wen, Auteur . - 2010 . - pp. 2096–2102. Industrial Chemisty Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2096–2102 Mots-clés : Catalysts  Au/CuOx-TiO2  Preferential Oxidation Résumé : A series of Au/CuOx−TiO2 catalysts with various Cu/Ti atomic ratios were prepared by deposition−precipitation method. The catalysts were characterized by inductively coupled plasma−mass spectrometry, X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The preferential oxidation of CO in H2 stream (PROX) on these catalysts was carried out in a fixed bed microreactor with a gas mixture (CO:O2:H2:He = 1.33:1.33:65.33:32.01 by volume ratios) was fed with a space velocity of 30000 mL/(g·h). Au/CuOx−TiO2 with various Cu/Ti atomic ratios showed similar gold particle size (2.3−2.5 nm). The gold in the starting material was almost totally loaded on the CuOx−TiO2 support at pH = 7. Au/CuOx−TiO2 catalysts with gold content of 1 wt % and calcined at 180 °C had superior catalytic activity and selectivity for CO oxidation at temperature of 80 °C. Au/CuOx−TiO2 (Cu/Ti = 4.8/95.2) had a CO conversion of 100% at 80 °C, and CO selectivity reaches 68%. Gold particles were well dispersed and stable on the support. Even after PROX reaction at 80 °C for a long time, most of the particles still maintained at 2.4 nm. The CO conversion slightly decreased from 100% to 95%, and CO selectivity was nearly the same. Au/CuOx−TiO2 is a highly effective and thermally stable catalyst for PROX reaction compared with Au/TiO2 catalyst. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901233e

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Au/FeOx−TiO2 catalysts for the preferential oxidation of CO in a H2 stream / Yi-Fen Yang in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10402–10407 Titre : Au/FeOx−TiO2 catalysts for the preferential oxidation of CO in a H2 stream Type de document : texte imprimé Auteurs : Yi-Fen Yang, Auteur ; Palanivelu Sangeetha, Auteur ; Chen, Yu-Wen, Auteur Année de publication : 2010 Article en page(s) : pp. 10402–10407 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Au/FeOx−  TiO2--Catalysts--Preferential--Oxidation--CO--H2--Stream Résumé : A series of gold catalysts supported on Fe2O3−TiO2 with various iron contents were prepared. A FeOx−TiO2 support was prepared via incipient-wetness impregnation with aqueous solution of Fe(NO3)3 on TiO2. A gold catalyst with a nominal loading of 1 wt % was prepared by deposition−precipitation at pH 7 and 65 °C. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The catalytic performance of these catalysts were investigated by preferential oxidation of carbon monoxide in hydrogen stream (PROX). The reaction was conducted in a fixed-bed microreactor with a feed of CO:O2:H2:He = 1:1:49:49 (volume ratios). A limited amount of oxygen was used. Gold catalysts have been reported to be efficient catalysts for the PROX reaction to reduce CO concentration to ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900806r [article] Au/FeOx−TiO2 catalysts for the preferential oxidation of CO in a H2 stream [texte imprimé] / Yi-Fen Yang, Auteur ; Palanivelu Sangeetha, Auteur ; Chen, Yu-Wen, Auteur . - 2010 . - pp. 10402–10407. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10402–10407 Mots-clés : Au/FeOx−  TiO2--Catalysts--Preferential--Oxidation--CO--H2--Stream Résumé : A series of gold catalysts supported on Fe2O3−TiO2 with various iron contents were prepared. A FeOx−TiO2 support was prepared via incipient-wetness impregnation with aqueous solution of Fe(NO3)3 on TiO2. A gold catalyst with a nominal loading of 1 wt % was prepared by deposition−precipitation at pH 7 and 65 °C. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The catalytic performance of these catalysts were investigated by preferential oxidation of carbon monoxide in hydrogen stream (PROX). The reaction was conducted in a fixed-bed microreactor with a feed of CO:O2:H2:He = 1:1:49:49 (volume ratios). A limited amount of oxygen was used. Gold catalysts have been reported to be efficient catalysts for the PROX reaction to reduce CO concentration to ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900806r

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Preferential oxidation of CO in H2 stream on Au/TiO2 catalysts / Palanivelu Sangeetha in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009)  

Public ISBD [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

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