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Influence of preparation method on the nanocrystalline porosity of α-Al2O3 and the catalytic properties of Pd/α-Al2O3 in selective acetylene hydrogenation / Sataporn Komhom in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6273–6279 Titre : Influence of preparation method on the nanocrystalline porosity of α-Al2O3 and the catalytic properties of Pd/α-Al2O3 in selective acetylene hydrogenation Type de document : texte imprimé Auteurs : Sataporn Komhom, Auteur ; Okorn Mekasuwandumrong, Auteur ; Joongjai Panpranot, Auteur Année de publication : 2009 Article en page(s) : pp. 6273–6279 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Nanocrystalline  α-Al2O3  powder  Crystallite  sizes Résumé : Nanocrystalline α-Al2O3 powder with average crystallite sizes of 34−68 nm have been synthesized by three different methods, namely, solvothermal, sol−gel, and precipitation. Although the smallest crystallite size of α-Al2O3 was obtained via the sol−gel synthesis, the α-Al2O3 sol−gel possessed the least amount of specific surface area and pore volume. A narrow pore size distribution with an average pore diameter of 15 nm can be obtained via solvothermal method, whereas the precipitation method yielded α-Al2O3 with larger pore size and a wider pore size distribution. When used as a support for palladium catalysts, the α-Al2O3 solvothermal provided the highest palladium dispersion and the best catalyst performance in selective hydrogenation of acetylene. The catalytic properties of Pd/α-Al2O3 solvothermal were improved, in terms of both acetylene conversion and ethylene selectivity. As shown by temperature program studies, the use of solvothermal-derived α-Al2O3 facilitated H2 reduction at low temperature and the desorption of ethylene and CO. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801784f [article] Influence of preparation method on the nanocrystalline porosity of α-Al2O3 and the catalytic properties of Pd/α-Al2O3 in selective acetylene hydrogenation [texte imprimé] / Sataporn Komhom, Auteur ; Okorn Mekasuwandumrong, Auteur ; Joongjai Panpranot, Auteur . - 2009 . - pp. 6273–6279. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6273–6279 Mots-clés : Nanocrystalline  α-Al2O3  powder  Crystallite  sizes Résumé : Nanocrystalline α-Al2O3 powder with average crystallite sizes of 34−68 nm have been synthesized by three different methods, namely, solvothermal, sol−gel, and precipitation. Although the smallest crystallite size of α-Al2O3 was obtained via the sol−gel synthesis, the α-Al2O3 sol−gel possessed the least amount of specific surface area and pore volume. A narrow pore size distribution with an average pore diameter of 15 nm can be obtained via solvothermal method, whereas the precipitation method yielded α-Al2O3 with larger pore size and a wider pore size distribution. When used as a support for palladium catalysts, the α-Al2O3 solvothermal provided the highest palladium dispersion and the best catalyst performance in selective hydrogenation of acetylene. The catalytic properties of Pd/α-Al2O3 solvothermal were improved, in terms of both acetylene conversion and ethylene selectivity. As shown by temperature program studies, the use of solvothermal-derived α-Al2O3 facilitated H2 reduction at low temperature and the desorption of ethylene and CO. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801784f