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Comparative study on adsorption of iodine vapor by silica-supported Cu nanoparticles and micronized copper / Mohammad Outokesh in Industrial & engineering chemistry research, Vol. 51 N° 47 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15315-15323 Titre : Comparative study on adsorption of iodine vapor by silica-supported Cu nanoparticles and micronized copper Type de document : texte imprimé Auteurs : Mohammad Outokesh, Auteur ; Arezoo Saket, Auteur ; Seyed Javad Ahmadi, Auteur Année de publication : 2013 Article en page(s) : pp. 15315-15323 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Nanoparticle  Adsorption  Comparative  study Résumé : The current study is aimed at comparison of adsorption behaviors of silica-supported Cu nanopartides (Si―N― Cu) and micrometric copper powder (Mi-Cu) for uptake of iodine vapor. The Si-N-Cu was synthesized by the decomposition of aqueous Cu(NO3)2 solution at supercritical condition, followed by reduction of the sample by H2―N2 mixture. The Si-N-Cu sample with 29.4 nm Cu particles adsorbed 95% of I2 at partial pressure 10―5 bar in 1 h, while the 1 μm Mi-Cu adsorbed 51% of iodine in 6 h, indicating higher yield and faster kinetics of the nanometric sample. Theoretical analysis revealed the existence of a strong thermodynamic size effect in the Cu―I2 reaction system, so that molar |ΔG| for 2 nm Cu particles was 2.5 times larger than |ΔG| for 1 μm particles. For the Mi-Cu, kinetics obeyed a three-dimensional diffusion model, while in the case of Si―N―Cu, diffusion did not play any role in the kinetics. Apparently, no passivation mechanism was operative in the iodination. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679652 [article] Comparative study on adsorption of iodine vapor by silica-supported Cu nanoparticles and micronized copper [texte imprimé] / Mohammad Outokesh, Auteur ; Arezoo Saket, Auteur ; Seyed Javad Ahmadi, Auteur . - 2013 . - pp. 15315-15323. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15315-15323 Mots-clés : Nanoparticle  Adsorption  Comparative  study Résumé : The current study is aimed at comparison of adsorption behaviors of silica-supported Cu nanopartides (Si―N― Cu) and micrometric copper powder (Mi-Cu) for uptake of iodine vapor. The Si-N-Cu was synthesized by the decomposition of aqueous Cu(NO3)2 solution at supercritical condition, followed by reduction of the sample by H2―N2 mixture. The Si-N-Cu sample with 29.4 nm Cu particles adsorbed 95% of I2 at partial pressure 10―5 bar in 1 h, while the 1 μm Mi-Cu adsorbed 51% of iodine in 6 h, indicating higher yield and faster kinetics of the nanometric sample. Theoretical analysis revealed the existence of a strong thermodynamic size effect in the Cu―I2 reaction system, so that molar |ΔG| for 2 nm Cu particles was 2.5 times larger than |ΔG| for 1 μm particles. For the Mi-Cu, kinetics obeyed a three-dimensional diffusion model, while in the case of Si―N―Cu, diffusion did not play any role in the kinetics. Apparently, no passivation mechanism was operative in the iodination. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679652