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Support and size effects of activated hydrotalcites for precombustion CO2 capture / Niels N. A. H. Meis in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1229–1235 Titre : Support and size effects of activated hydrotalcites for precombustion CO2 capture Type de document : texte imprimé Auteurs : Niels N. A. H. Meis, Auteur ; Johannes H. Bitter, Auteur ; Krijn P. de Jong, Auteur Année de publication : 2010 Article en page(s) : pp. 1229–1235 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Support--Size  Effects--Activated  Hydrotalcites--Precombustion  CO2  Capture Résumé : A series of Mg−Al hydrotalcites (HTs) with lateral platelet sizes ranging from 40 nm to 2 μm were prepared hydrothermally. Small HT platelets (20 nm) were obtained by deposition onto a carbon nanofiber (CNF) support. The CO2 sorption capacity at 523 K for the activated unsupported HT was low (0.1 mmol·g−1), regardless of the platelet size of the HT precursor. In addition, no relation was found between the CO2 sorption properties of activated HTs and their specific surface area. The sorption capacity of the activated CNF-supported HTs was increased, depending on the HT loading, by an order of magnitude (1.3−2.5 mmol·gHT−1) compared to that of the activated unsupported HT. We propose that the CO2 sorption capacities of HTs are determined by the amounts of low-coordination oxygen sites in the Mg(Al)Ox nanoparticles, which is highest on supported HTs. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901114d [article] Support and size effects of activated hydrotalcites for precombustion CO2 capture [texte imprimé] / Niels N. A. H. Meis, Auteur ; Johannes H. Bitter, Auteur ; Krijn P. de Jong, Auteur . - 2010 . - pp. 1229–1235. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1229–1235 Mots-clés : Support--Size  Effects--Activated  Hydrotalcites--Precombustion  CO2  Capture Résumé : A series of Mg−Al hydrotalcites (HTs) with lateral platelet sizes ranging from 40 nm to 2 μm were prepared hydrothermally. Small HT platelets (20 nm) were obtained by deposition onto a carbon nanofiber (CNF) support. The CO2 sorption capacity at 523 K for the activated unsupported HT was low (0.1 mmol·g−1), regardless of the platelet size of the HT precursor. In addition, no relation was found between the CO2 sorption properties of activated HTs and their specific surface area. The sorption capacity of the activated CNF-supported HTs was increased, depending on the HT loading, by an order of magnitude (1.3−2.5 mmol·gHT−1) compared to that of the activated unsupported HT. We propose that the CO2 sorption capacities of HTs are determined by the amounts of low-coordination oxygen sites in the Mg(Al)Ox nanoparticles, which is highest on supported HTs. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901114d