Adsorption Behavior of Metal–Organic Frameworks for Thiophenic Sulfur from Diesel Oil / Hong - Xing Zhang in Industrial & engineering chemistry research, Vol. 51 N° 38 (Septembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12449-12455 Titre : Adsorption Behavior of Metal–Organic Frameworks for Thiophenic Sulfur from Diesel Oil Type de document : texte imprimé Auteurs : Hong - Xing Zhang, Auteur ; Hong-Liang Huang, Auteur ; Chun-Xi Li, Auteur Année de publication : 2012 Article en page(s) : pp. 12449-12455 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorption Résumé : Four metal―organic frameworks (MOFs) are synthesized using two different metal centers and two different organic ligands, viz., Cu3[C6H3(CO2)3]2 (Cu-BTC), Cu[O2C―C6H4―CO2] (Cu-BDC), Cr(OH)[O2C―C6H4―CO2] (Cr-BDC), and Cr3F(H2O)3O[C6H3(CO2)3]2 (Cr-BTC). Their adsorption behaviors for thiophenic sulfurs in model diesel oils are systematically investigated at mild temperatures and follow the order Cu-BTC > Cr-BDC > Cr-BTC ≫ Cu-BDC. Meanwhile, the adsorption capacity of different sulfur compounds follows the order dibenzothiophene (DBT) > benzothiophene (BT) > 3-methylthiophene (3-MT). The MOFs adsorption mechanism is regarded as a combined effect of many factors involving appropriate framework structure, suitable pore size and shape, and exposed Lewis acid site matching the S-compound to be adsorbed. The difference in adsorptive activity among the organosulfurs is mainly ascribed to their π-electron number and the electron density on the S-atom. Finally, the used MOF can be easily regenerated by solvent washing and recycled at least five times. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26399696 [article] Adsorption Behavior of Metal–Organic Frameworks for Thiophenic Sulfur from Diesel Oil [texte imprimé] / Hong - Xing Zhang, Auteur ; Hong-Liang Huang, Auteur ; Chun-Xi Li, Auteur . - 2012 . - pp. 12449-12455. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 38 (Septembre 2012) . - pp. 12449-12455 Mots-clés : Adsorption Résumé : Four metal―organic frameworks (MOFs) are synthesized using two different metal centers and two different organic ligands, viz., Cu3[C6H3(CO2)3]2 (Cu-BTC), Cu[O2C―C6H4―CO2] (Cu-BDC), Cr(OH)[O2C―C6H4―CO2] (Cr-BDC), and Cr3F(H2O)3O[C6H3(CO2)3]2 (Cr-BTC). Their adsorption behaviors for thiophenic sulfurs in model diesel oils are systematically investigated at mild temperatures and follow the order Cu-BTC > Cr-BDC > Cr-BTC ≫ Cu-BDC. Meanwhile, the adsorption capacity of different sulfur compounds follows the order dibenzothiophene (DBT) > benzothiophene (BT) > 3-methylthiophene (3-MT). The MOFs adsorption mechanism is regarded as a combined effect of many factors involving appropriate framework structure, suitable pore size and shape, and exposed Lewis acid site matching the S-compound to be adsorbed. The difference in adsorptive activity among the organosulfurs is mainly ascribed to their π-electron number and the electron density on the S-atom. Finally, the used MOF can be easily regenerated by solvent washing and recycled at least five times. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26399696

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Catalytic oxidative desulfurization of fuel by H2O2 in situ produced via oxidation of 2 - propanol / Hong - Xing Zhang in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4868–4874 Titre : Catalytic oxidative desulfurization of fuel by H2O2 in situ produced via oxidation of 2 - propanol Type de document : texte imprimé Auteurs : Hong - Xing Zhang, Auteur ; Jia-jun Gao, Auteur ; Hong Meng, Auteur Année de publication : 2012 Article en page(s) : pp. 4868–4874 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic oxidative Résumé : A novel integrated process is proposed for the catalytic oxidative desulfurization of fuel oil, in which the oxidant H2O2 is in situ generated by oxidizing 2-propanol with oxygen, and its feasibility is evaluated in terms of the S-conversion of 3-methylthiophene (3-MT), benzothiophene (BT), and dibenzothiophene (DBT) in octane under varying conditions. The catalysis of [π-C5H5NC16H33]3[PW4O16] is found to be much superior to H3PW12O40 and [(C4H9)4N]3[PW12O40] due to its good dispersivity in oil and adsorptivity for S-compounds. Some influencing factors for the S-conversion were studied, viz., time, temperature, various S-compounds, and the amount of 2-propanol, initiator, oxygen, and catalyst. All factors that favor the production of the 2-propanol radicals affect the desulfurization rate remarkably. Both BT and DBT can be removed efficiently at mild conditions (1.4 MPa O2, 90 °C) in 6 h with S-conversion above 96%, and the resulting sulfones can be separated via settling or filtration. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300035c [article] Catalytic oxidative desulfurization of fuel by H2O2 in situ produced via oxidation of 2 - propanol [texte imprimé] / Hong - Xing Zhang, Auteur ; Jia-jun Gao, Auteur ; Hong Meng, Auteur . - 2012 . - pp. 4868–4874. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4868–4874 Mots-clés : Catalytic oxidative Résumé : A novel integrated process is proposed for the catalytic oxidative desulfurization of fuel oil, in which the oxidant H2O2 is in situ generated by oxidizing 2-propanol with oxygen, and its feasibility is evaluated in terms of the S-conversion of 3-methylthiophene (3-MT), benzothiophene (BT), and dibenzothiophene (DBT) in octane under varying conditions. The catalysis of [π-C5H5NC16H33]3[PW4O16] is found to be much superior to H3PW12O40 and [(C4H9)4N]3[PW12O40] due to its good dispersivity in oil and adsorptivity for S-compounds. Some influencing factors for the S-conversion were studied, viz., time, temperature, various S-compounds, and the amount of 2-propanol, initiator, oxygen, and catalyst. All factors that favor the production of the 2-propanol radicals affect the desulfurization rate remarkably. Both BT and DBT can be removed efficiently at mild conditions (1.4 MPa O2, 90 °C) in 6 h with S-conversion above 96%, and the resulting sulfones can be separated via settling or filtration. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300035c

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Removal mechanism of thiophenic compounds in model oil by inorganic lewis acids / Jia-jun Gao in Industrial & engineering chemistry research, Vol. 51 N° 12 (Mars 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4682–4691 Titre : Removal mechanism of thiophenic compounds in model oil by inorganic lewis acids Type de document : texte imprimé Auteurs : Jia-jun Gao, Auteur ; Hong-qiang Li, Auteur ; Hong - Xing Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 4682–4691 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorption Inorganic lewis Résumé : The adsorptive desulfurization ability of four inorganic Lewis acids (AlCl3, FeCl3, ZnCl2, and CuCl) for three thiophenic S-compounds, viz., 3-methylthiophene (3-MT), benzothiophene (BT), and dibenzothiophene (DBT), from their model oils were studied here experimentally at 290 K. The results were explained in terms of the theory of hard and soft acids and bases (HSAB) reasonably. The results show that AlCl3 has excellent removal ability for 3-MT with its adsorbance being 141.4 without toluene and 123.0 mgS/g with 25 wt % toluene. It is noteworthy that 3-MT is removed solely through complexing adsorption; in contrast, BT is adsorbed, accompanied with the formation of oil soluble BT oligomers under catalysis of AlCl3 which can promote the complexation greatly. Further, the addition of benzene and toluene can accelerate the desulfurization rate of 3-MT and BT due to the concentration of aromatics on the adsorbent and the oligomerization between BT and the aromatics. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202831p [article] Removal mechanism of thiophenic compounds in model oil by inorganic lewis acids [texte imprimé] / Jia-jun Gao, Auteur ; Hong-qiang Li, Auteur ; Hong - Xing Zhang, Auteur . - 2012 . - pp. 4682–4691. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4682–4691 Mots-clés : Adsorption Inorganic lewis Résumé : The adsorptive desulfurization ability of four inorganic Lewis acids (AlCl3, FeCl3, ZnCl2, and CuCl) for three thiophenic S-compounds, viz., 3-methylthiophene (3-MT), benzothiophene (BT), and dibenzothiophene (DBT), from their model oils were studied here experimentally at 290 K. The results were explained in terms of the theory of hard and soft acids and bases (HSAB) reasonably. The results show that AlCl3 has excellent removal ability for 3-MT with its adsorbance being 141.4 without toluene and 123.0 mgS/g with 25 wt % toluene. It is noteworthy that 3-MT is removed solely through complexing adsorption; in contrast, BT is adsorbed, accompanied with the formation of oil soluble BT oligomers under catalysis of AlCl3 which can promote the complexation greatly. Further, the addition of benzene and toluene can accelerate the desulfurization rate of 3-MT and BT due to the concentration of aromatics on the adsorbent and the oligomerization between BT and the aromatics. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202831p

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