Promoting effect of adding carbon black to TiO2 for aqueous photocatalytic degradation of methyl orange / Chih-Chung Mao in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009)  

Public ISBD [article]  inChemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 744-749 Titre : Promoting effect of adding carbon black to TiO2 for aqueous photocatalytic degradation of methyl orange Type de document : texte imprimé Auteurs : Chih-Chung Mao, Auteur ; Hung-Shan Weng, Auteur Année de publication : 2010 Article en page(s) : pp. 744-749 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Photocatalytic degradation Composite catalysts Titania Carbon black Index. décimale : 660 Résumé : The photocatalytic activity and the promoting effect of titania (TiO2) incorporated with carbon black (CB) for removing the pollutant in wastewater were investigated. The TiO2/CB composite photocatalysts with various ratios of TiO2 to CB were prepared by the sol–gel method. The degradation of methyl orange (MO), as the model reaction, was carried out in the aqueous slurry solution using these photocatalysts at 20 °C. Experimental results reveal that the ratio of TiO2 to CB largely affected the performance of composite catalyst. An optimal weight ratio of 1 for the highest photocatalytic capability was found. The photocatalytic performances of TiO2/CB catalysts were also found better than those of TiO2 incorporated with activated carbon. The better promoting effect might be attributed to the larger pores of CB which allow a faster diffusion of the adsorbed MO from CB toward TiO2 and the high electrical conductivity of CB which can reduce the recombination of electrons and holes generated in TiO2. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X7GMP2-5&_user=6 [...] [article] Promoting effect of adding carbon black to TiO2 for aqueous photocatalytic degradation of methyl orange [texte imprimé] / Chih-Chung Mao, Auteur ; Hung-Shan Weng, Auteur . - 2010 . - pp. 744-749. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 744-749 Mots-clés : Photocatalytic degradation Composite catalysts Titania Carbon black Index. décimale : 660 Résumé : The photocatalytic activity and the promoting effect of titania (TiO2) incorporated with carbon black (CB) for removing the pollutant in wastewater were investigated. The TiO2/CB composite photocatalysts with various ratios of TiO2 to CB were prepared by the sol–gel method. The degradation of methyl orange (MO), as the model reaction, was carried out in the aqueous slurry solution using these photocatalysts at 20 °C. Experimental results reveal that the ratio of TiO2 to CB largely affected the performance of composite catalyst. An optimal weight ratio of 1 for the highest photocatalytic capability was found. The photocatalytic performances of TiO2/CB catalysts were also found better than those of TiO2 incorporated with activated carbon. The better promoting effect might be attributed to the larger pores of CB which allow a faster diffusion of the adsorbed MO from CB toward TiO2 and the high electrical conductivity of CB which can reduce the recombination of electrons and holes generated in TiO2. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X7GMP2-5&_user=6 [...]

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Regeneration of coked al-promoted sulfated zirconia catalysts by high pressure hydrogen / Yang, Ying-Chieh in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1982–1985 Titre : Regeneration of coked al-promoted sulfated zirconia catalysts by high pressure hydrogen Type de document : texte imprimé Auteurs : Yang, Ying-Chieh, Auteur ; Hung-Shan Weng, Auteur Année de publication : 2010 Article en page(s) : pp 1982–1985 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalysts High Pressure Hydrogen. Résumé : To avoid the inconvenience and danger caused by using air or oxygen as a regenerating gas for coked catalysts, this work proposes an effective regeneration method for the fouled Al-promoted sulfated zirconia (AL/SZ) catalyst. This work tries hydrogen for regenerating fouled catalysts; nevertheless, regaining activity is low when introducing atmospheric hydrogen as a regenerating gas. Fortunately, over 98% of original activity can be regained using high pressure hydrogen (2.1 MPa) at 250 °C within 8 h. The operation temperature for this new regeneration method is much lower than that for conventional methods using air or oxygen as a regenerating gas. This method does not affect the product distribution of n-C4 isomerization. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900338b [article] Regeneration of coked al-promoted sulfated zirconia catalysts by high pressure hydrogen [texte imprimé] / Yang, Ying-Chieh, Auteur ; Hung-Shan Weng, Auteur . - 2010 . - pp 1982–1985. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1982–1985 Mots-clés : Catalysts High Pressure Hydrogen. Résumé : To avoid the inconvenience and danger caused by using air or oxygen as a regenerating gas for coked catalysts, this work proposes an effective regeneration method for the fouled Al-promoted sulfated zirconia (AL/SZ) catalyst. This work tries hydrogen for regenerating fouled catalysts; nevertheless, regaining activity is low when introducing atmospheric hydrogen as a regenerating gas. Fortunately, over 98% of original activity can be regained using high pressure hydrogen (2.1 MPa) at 250 °C within 8 h. The operation temperature for this new regeneration method is much lower than that for conventional methods using air or oxygen as a regenerating gas. This method does not affect the product distribution of n-C4 isomerization. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900338b

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