| DOI | Trouver le DOI : https://doi.org/10.1080/08927020802101742 |
|---|
| Auteur | Rechercher : Stoyanov, Stanislav R.1; Rechercher : Gusarov, Sergey1; Rechercher : Kovalenko, Andriy1 |
|---|
| Affiliation | - Conseil national de recherches du Canada. Institut national de nanotechnologie
|
|---|
| Format | Texte, Article |
|---|
| Sujet | bitumen; desulfurisation; zeolite nanoparticle; ion exchange; periodic DFT |
|---|
| Résumé | We investigate bitumen desulfurisation on zeolite chabazite nanoparticles that contain Ag+ and Cu+ by using periodic density functional theory. The large bitumen molecules that contain thiophene derivative impurities and useful aromatic hydrocarbons cannot enter into zeolite pores but adsorb on the outer surface of the zeolite. The zeolite nanoparticle surface can be optimised for efficient impurities removal and bitumen upgrading, as we have shown recently. On chabazite nanoparticle surface, Ag+ that reside near the main channel enhance the bitumen fragment adsorption in the order benzene < thiophene < benzothiophene < dibenzothiophene. For Cu+, the bitumen fragment adsorption strength increases in the order benzene < dibenzothiophene < benzothiophene < thiophene. The different trends arise from the spatial constraint of the surface termination and the smaller ionic radius of Cu+ relative to Ag+. Our results show that zeolite surface modifications allow for stronger adsorption of thiophenes relative to hydrocarbons. Our results can be applied toward the rational design of zeolite nanoparticles for bitumen upgrading. We conclude that the preferred configurations of organic macromolecules adsorbed on zeolite outer surfaces can be safely predicted by using Fukui functions. |
|---|
| Date de publication | 2008-09-01 |
|---|
| Dans | |
|---|
| Langue | anglais |
|---|
| Publications évaluées par des pairs | Oui |
|---|
| Numéro du CNRC | 331 |
|---|
| Numéro NPARC | 8926510 |
|---|
| Exporter la notice | Exporter en format RIS |
|---|
| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
|---|
| Identificateur de l’enregistrement | 97228489-0dc4-4c7e-ba39-a06af6541dc4 |
|---|
| Enregistrement créé | 2009-04-23 |
|---|
| Enregistrement modifié | 2020-04-15 |
|---|
