Cu – Zn – al oxide cores packed by metal - doped amorphous silica – alumina membrane for catalyzing the hydrogenation of carbon dioxide to dimethyl ether / Fei Zha in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 345–352 Titre : Cu – Zn – al oxide cores packed by metal - doped amorphous silica – alumina membrane for catalyzing the hydrogenation of carbon dioxide to dimethyl ether Type de document : texte imprimé Auteurs : Fei Zha, Auteur ; Jian Ding, Auteur ; Yue Chang, Auteur Année de publication : 2012 Article en page(s) : pp. 345–352 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydrogenation Catalyst Résumé : The direct synthesis of a millimeter-sized core–shell-like catalyst that can be used in the hydrogenation of carbon dioxide to dimethyl ether was achieved by in situ hydrothermal synthesis. The capsule catalyst exhibited a special core–shell-like structure of a coprecipitated CuO/ZnO/Al2O3 core enwrapped by one layer of metal-doped amorphous silica–alumina (ASA) membrane and was characterized by XRD, SEM, and thermal analysis. The effects of metal oxide cores and membranes prepared with different precipitants, structure-directing templates, and hydrothermal synthesis conditions, as well as temperatures and pressures, on the catalytic activity of the capsule catalyst for the hydrogenation of CO2 to dimethyl ether were investigated. Under reaction conditions of a pressure of 3.0 MPa, a space velocity (SV) of 1800 mL·gcat–1·h–1, a CO2/H2 volume ratio of 1:3, and a temperature of 266 °C, the capsule catalysts with cores coprecipitated by urea using n-butylamine as the templating agent to enwrap the amorphous silica–alumina membranes had excellent catalytic properties for dimethyl ether synthesis, and the conversion of CO2 reached 47.1%, with a dimethyl ether yield and selectivity of 19.9% and 42.4%, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202090f [article] Cu – Zn – al oxide cores packed by metal - doped amorphous silica – alumina membrane for catalyzing the hydrogenation of carbon dioxide to dimethyl ether [texte imprimé] / Fei Zha, Auteur ; Jian Ding, Auteur ; Yue Chang, Auteur . - 2012 . - pp. 345–352. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 345–352 Mots-clés : Hydrogenation Catalyst Résumé : The direct synthesis of a millimeter-sized core–shell-like catalyst that can be used in the hydrogenation of carbon dioxide to dimethyl ether was achieved by in situ hydrothermal synthesis. The capsule catalyst exhibited a special core–shell-like structure of a coprecipitated CuO/ZnO/Al2O3 core enwrapped by one layer of metal-doped amorphous silica–alumina (ASA) membrane and was characterized by XRD, SEM, and thermal analysis. The effects of metal oxide cores and membranes prepared with different precipitants, structure-directing templates, and hydrothermal synthesis conditions, as well as temperatures and pressures, on the catalytic activity of the capsule catalyst for the hydrogenation of CO2 to dimethyl ether were investigated. Under reaction conditions of a pressure of 3.0 MPa, a space velocity (SV) of 1800 mL·gcat–1·h–1, a CO2/H2 volume ratio of 1:3, and a temperature of 266 °C, the capsule catalysts with cores coprecipitated by urea using n-butylamine as the templating agent to enwrap the amorphous silica–alumina membranes had excellent catalytic properties for dimethyl ether synthesis, and the conversion of CO2 reached 47.1%, with a dimethyl ether yield and selectivity of 19.9% and 42.4%, respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202090f

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