| Titre : | Comparative study on adsorption of iodine vapor by silica-supported Cu nanoparticles and micronized copper (2013) |
| Auteurs : | Mohammad Outokesh, Auteur ; Arezoo Saket, Auteur ; Seyed Javad Ahmadi, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 51 N° 47, Novembre 2012) |
| Article en page(s) : | pp. 15315-15323 |
| Note générale : | Industrial chemistry |
| Langues : | Anglais |
| Tags : | 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 |
