Role of phosphorus in carbon matrix in desulfurization of diesel fuel using adsorption process

FUEL

卷:92

Article

Seredych, Mykola¹  Wu, Chi Tang²  Brender, Patrice³  Ania, Conchi O.^3,4  Vix-Guterl, Cathie³  Bandosz, Teresa J.¹ 

[1] CUNY City Coll, Dept Chem, New York, NY 10031 USA

[2] Stuyvensant High Sch, New York, NY 10282 USA

[3] CNRS LRC 7228, Inst Sci Mat Mulhouse, F-68057 Mulhouse, France

[4] CSIC, Inst Nacl Carbon, INCAR, Oviedo 33011, Spain

关键词: Dibenzothiophenes;    Model diesel fuel;    Activated carbon;    P-functionalities;    Reactive adsorption;   

DOI  :  10.1016/j.fuel.2011.08.007

来源: Elsevier

【 摘 要 】

Adsorptive removal of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (DMDBT) from model diesel fuel with 20 ppmw total concentration of sulfur was investigated on polymer-derived carbons with incorporated heteroatoms of oxygen, sulfur and phosphorus. The materials before and after exposure to model diesel fuel were characterized using adsorption of nitrogen, thermal analysis, potentiometric titration, XPS and elemental analysis. The selectivities for DBT and DMDBT adsorption were calculated with reference to naphthalene. The results indicated that the presence of phosphorus, especially in the form of pyrophosphates and P2O5, increases the capacity and selectivity for removal of dibenzothiophenes. It also affects the adsorption mechanism. Phosphorus suppresses oxidation reactions of DBT and DMDBT. Owing to a possible location of bulky phosphorus groups in pore with sizes between 1 and 3 nm thiophenic molecules are strongly adsorbed there via dispersive forces. Acidic environment also enhances adsorption via acid-base interactions. Physical adsorption mechanism and stability of surface make these carbons attractive candidates for thermal regeneration. (C) 2011 Elsevier Ltd. All rights reserved.

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