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A comparative study of ZnO-CuO-Al2O3/SiO2-Al2O3 composite and hybrid catalysts for direct synthesis of dimethyl ether from syngas / Sajo P. Naik in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9791–9794 Titre : A comparative study of ZnO-CuO-Al2O3/SiO2-Al2O3 composite and hybrid catalysts for direct synthesis of dimethyl ether from syngas Type de document : texte imprimé Auteurs : Sajo P. Naik, Auteur ; Hao Du, Auteur ; Haijun Wan, Auteur Année de publication : 2009 Article en page(s) : p. 9791–9794 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Comparative  study  ZnO−CuO−Al2O3/SiO2−Al2O3  Dimethyl  ether  Syngas Résumé : Two different strategies for the preparation of active dimethyl ether catalysts are evaluated using CuO−ZnO−Al2O3 and SiO2−Al2O3 as methanol synthesis and methanol dehydration catalysts components, respectively. Composite catalysts are prepared by mixing of the two freshly precipitated catalyst precursors and by coprecipitation methods, whereas hybrid catalysts are prepared by mechanical mixing of the two calcined catalyst components by grinding. Composite catalysts are partially deactivated during the catalyst preparation or calcination stages and therefore exhibit much lower activity, as compared to the hybrid catalysts toward syngas conversions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801437c [article] A comparative study of ZnO-CuO-Al2O3/SiO2-Al2O3 composite and hybrid catalysts for direct synthesis of dimethyl ether from syngas [texte imprimé] / Sajo P. Naik, Auteur ; Hao Du, Auteur ; Haijun Wan, Auteur . - 2009 . - p. 9791–9794. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9791–9794 Mots-clés : Comparative  study  ZnO−CuO−Al2O3/SiO2−Al2O3  Dimethyl  ether  Syngas Résumé : Two different strategies for the preparation of active dimethyl ether catalysts are evaluated using CuO−ZnO−Al2O3 and SiO2−Al2O3 as methanol synthesis and methanol dehydration catalysts components, respectively. Composite catalysts are prepared by mixing of the two freshly precipitated catalyst precursors and by coprecipitation methods, whereas hybrid catalysts are prepared by mechanical mixing of the two calcined catalyst components by grinding. Composite catalysts are partially deactivated during the catalyst preparation or calcination stages and therefore exhibit much lower activity, as compared to the hybrid catalysts toward syngas conversions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801437c