000			02118nab a2200205 4500
005			20260520000843.0
008			260224s2009 xxu
245	0	0	_aHydro-treating of asphaltenes in supercritical toluene with MgO-supported Fe, Ni, NiMo, and CoMo catalysts
260			_a _b _cjul./ago. 2009
270			_a15/06/2010 ; 15/06/2010
300			_a7 p. ; 3645-3651
520			_aTranscripción del resumen del autor. For the first time, the AVTB-derived asphaltenes (containing very high concentrations of sulfur (7.70 wt % S) and nitrogen (1.08 wt % N)) were hydrotreated over novel MgO-supported Fe, Ni, NiMo, and CoMo catalysts in supercritical toluene at 380 °C under hydrogen of 5 MPa (cold pressure) in a batch reactor. The supercritical toluene alone without any catalyst was found to be effective for conversion of the highly aromatic asphaltenes (AS) to less aromatic maltenes (MA) through a thermal cracking mechanism. All the MgO-supported catalysts proved to be effective for hydro-conversion of AS to MA in supercritical toluene. The activities of these catalysts for AS conversion showed the order of sequence of Fe/MgO < Ni/MgO < CoMo/MgO < NiMo/MgO. Among all the MgO-supported catalysts tested, NiMo/MgO was found to be the most active one for promoting the removal of sulfur and AS. The sulfur/nitrogen/AS removal efficiencies for the NiMo/MgO catalyst increased with the treatment time, and the efficiencies at 120 min of treatment attained as high as 43%, 30%, and 70%, respectively. The MgO-supported catalysts showed excellent performance for preventing and retarding the formation of highly condensed aromatics or coke in the hydro-treatment of AS in supercritical toluene. With the presence of NiMo/MgO catalyst, hydro-treating AS in the supercritical toluene for a reaction time up to 120 min produced a strikingly low yield (<0.7%) of toluene-insoluble product.
581			_a4
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aXu, Chumbao (Charles) _942667
100	1		_aSu, Huasu _942668
100	1		_aGhosh, Mainak _942669
999			_c171028 _d171028