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K10 montmorillonite based catalysts for the growth of multiwalled carbon nanotubes through catalytic chemical vapor deposition / Candida Milone in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3242–3249 Titre : K10 montmorillonite based catalysts for the growth of multiwalled carbon nanotubes through catalytic chemical vapor deposition Type de document : texte imprimé Auteurs : Candida Milone, Auteur ; Manikandan Dhanagopal, Auteur ; Saveria Santangelo, Auteur Année de publication : 2010 Article en page(s) : pp. 3242–3249 Note générale : Industial Chemistry Langues : Anglais (eng) Mots-clés : K10  Montmorillonite  Catalysts  Multiwalled  Carbon  Nanotubes  Catalytic  Chemical  Vapor  Deposition Résumé : Multiwalled carbon nanotubes (MWCNT) are synthesized by isobutane decomposition at 700 °C over as-purchased and iron-loaded K10-montmorillonite catalysts. The results show that, upon reduction at 500 °C, K10 catalyzes isobutane decomposition. Few carbon fibers accompany the prevailing carbon flakes formation. Upon Na+ exchange or by increasing the reduction temperature, the activity of the clay decreases. Fe−K10 behaves as a bifunctional catalyst: on added metal sites, MWCNT preferentially form, while on the support, carbon flake formation mainly occurs. At a given metal load, the increase of the reduction temperature up to 700 °C or the use of Na+-exchanged K10 as a support generally leads to an enhancement of the selectivity to MWCNT, because of the diminishing of the support active sites. Under the present reaction conditions, Fe supported on Na+ exchanged K10 are the most active among the investigated catalysts. MWCNT copiously form, both at low and high metal load, and exhibit the highest structural order. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9018275 [article] K10 montmorillonite based catalysts for the growth of multiwalled carbon nanotubes through catalytic chemical vapor deposition [texte imprimé] / Candida Milone, Auteur ; Manikandan Dhanagopal, Auteur ; Saveria Santangelo, Auteur . - 2010 . - pp. 3242–3249. Industial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3242–3249 Mots-clés : K10  Montmorillonite  Catalysts  Multiwalled  Carbon  Nanotubes  Catalytic  Chemical  Vapor  Deposition Résumé : Multiwalled carbon nanotubes (MWCNT) are synthesized by isobutane decomposition at 700 °C over as-purchased and iron-loaded K10-montmorillonite catalysts. The results show that, upon reduction at 500 °C, K10 catalyzes isobutane decomposition. Few carbon fibers accompany the prevailing carbon flakes formation. Upon Na+ exchange or by increasing the reduction temperature, the activity of the clay decreases. Fe−K10 behaves as a bifunctional catalyst: on added metal sites, MWCNT preferentially form, while on the support, carbon flake formation mainly occurs. At a given metal load, the increase of the reduction temperature up to 700 °C or the use of Na+-exchanged K10 as a support generally leads to an enhancement of the selectivity to MWCNT, because of the diminishing of the support active sites. Under the present reaction conditions, Fe supported on Na+ exchanged K10 are the most active among the investigated catalysts. MWCNT copiously form, both at low and high metal load, and exhibit the highest structural order. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9018275