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Adsorptive removal of dimethyl disulfide in olefin rich C4 with ion-exchanged zeolites / Jieun Lee in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6382-6390 Titre : Adsorptive removal of dimethyl disulfide in olefin rich C4 with ion-exchanged zeolites Type de document : texte imprimé Auteurs : Jieun Lee, Auteur ; Hee Tae Beum, Auteur ; Chang Hyun Ko, Auteur Année de publication : 2011 Article en page(s) : pp. 6382-6390 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Zeolite Résumé : The purpose of this study is to investigate the removal of dimethyl disulfide (DMDS) in the olefin rich Fluid Catalytic Cracking (FCC) C4 hydrocarbon mixture with the ion-exchanged β-zeolite. Effects of Si/Al ratio, metal cations, and the ion exchange level on the removal efficiency have been accessed by performing the breakthrough experiment with a model C4 mixture of 20 ppm DMDS in 40% n-Butane/60% 1-Butene. The metal ions used for the preparation of ion exchanged zeolite are Ag(I), Cu(II), Ni(II), Fe(III), and Cu(I). The adsorption characteristics of 1-Butene and DMDS on the adsorbent have been studied through the temperature programmed desorption (TPD). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158935 [article] Adsorptive removal of dimethyl disulfide in olefin rich C4 with ion-exchanged zeolites [texte imprimé] / Jieun Lee, Auteur ; Hee Tae Beum, Auteur ; Chang Hyun Ko, Auteur . - 2011 . - pp. 6382-6390. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6382-6390 Mots-clés : Zeolite Résumé : The purpose of this study is to investigate the removal of dimethyl disulfide (DMDS) in the olefin rich Fluid Catalytic Cracking (FCC) C4 hydrocarbon mixture with the ion-exchanged β-zeolite. Effects of Si/Al ratio, metal cations, and the ion exchange level on the removal efficiency have been accessed by performing the breakthrough experiment with a model C4 mixture of 20 ppm DMDS in 40% n-Butane/60% 1-Butene. The metal ions used for the preparation of ion exchanged zeolite are Ag(I), Cu(II), Ni(II), Fe(III), and Cu(I). The adsorption characteristics of 1-Butene and DMDS on the adsorbent have been studied through the temperature programmed desorption (TPD). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158935

Selective dibenzothiophene adsorption on graphene prepared using different methods / Hoon Sub Song in Industrial & engineering chemistry research, Vol. 51 N° 30 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp.10259–10264 Titre : Selective dibenzothiophene adsorption on graphene prepared using different methods Type de document : texte imprimé Auteurs : Hoon Sub Song, Auteur ; Chang Hyun Ko, Auteur ; Wook Ahn, Auteur Année de publication : 2012 Article en page(s) : pp.10259–10264 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Dibenzothiophene  Adsorption Résumé : Graphite oxide synthesized with phosphoric acid, labeled “GOP”, shows a higher degree of oxidation and has a larger interlayer spacing than the oxide prepared using the conventional Hummers method, referred to as “GOH”, as confirmed by X-ray photoelectron spectroscopy and X-ray diffraction analyses. This study was performed under the assumption that the oxygen-containing functional groups between the GOP layers are more easily reduced than those between the GOH layers. Raman analysis supported this assumption in that the reduced graphene from GOP has a larger number of sp2 carbons and fewer defects than the graphene obtained from GOH. The relative extent of defects in graphene can be investigated by dibenzothiophene (DBT) adsorption, which requires π–π interactions between the free π-bonds of sp2 atoms from graphene and those from the aromatic ring of DBT. The graphene obtained from GOP showed higher DBT adsorption capacity than that synthesized from GOH. In addition, the DBT adsorption capacity on graphene decreased as the concentrations of other aromatic compounds increased. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301209c [article] Selective dibenzothiophene adsorption on graphene prepared using different methods [texte imprimé] / Hoon Sub Song, Auteur ; Chang Hyun Ko, Auteur ; Wook Ahn, Auteur . - 2012 . - pp.10259–10264. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp.10259–10264 Mots-clés : Dibenzothiophene  Adsorption Résumé : Graphite oxide synthesized with phosphoric acid, labeled “GOP”, shows a higher degree of oxidation and has a larger interlayer spacing than the oxide prepared using the conventional Hummers method, referred to as “GOH”, as confirmed by X-ray photoelectron spectroscopy and X-ray diffraction analyses. This study was performed under the assumption that the oxygen-containing functional groups between the GOP layers are more easily reduced than those between the GOH layers. Raman analysis supported this assumption in that the reduced graphene from GOP has a larger number of sp2 carbons and fewer defects than the graphene obtained from GOH. The relative extent of defects in graphene can be investigated by dibenzothiophene (DBT) adsorption, which requires π–π interactions between the free π-bonds of sp2 atoms from graphene and those from the aromatic ring of DBT. The graphene obtained from GOP showed higher DBT adsorption capacity than that synthesized from GOH. In addition, the DBT adsorption capacity on graphene decreased as the concentrations of other aromatic compounds increased. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301209c