000			01799nab a2200205 4500
005			20260520000817.0
008			260224s2009 xxu
245	0	0	_aStructural characterization of asphaltenes obtained from hydroprocessed crude oils by SEM and TEM
260			_a _b _cene. 2009
270			_a15/05/2009 ; 20/04/2009
300			_a10 p. ; 429-439
520			_aTranscripción del resúmen publicado por el autor: Asphaltenes from Maya crude and its hydroprocessed oils at different reaction conditions were precipitated and studied by scanning and transmission electron microscopy (SEM and TEM). In order to better understand the changes occured in asphaltene structure during hydroprocessing the crude oil fractionation procedure with solvents was used to separate asphaltenes based on their solubility properties. Different asphaltene morphologies were observed depending on the mixture of solvents used for fractionating asphaltenes and reaction conditions at which crude oil was hydroprocessed. A comparison between asphaltenes from hydroprocessed and pure Maya crude oil was carried out on the way to distinguish morphological changes at microscopic level. It was observed that removal of alkyl chains during hydroprocessing makes asphaltenes suffer a rearrangement in solid state favoring stacking of aromatic cores as determined by TEM. SEM microscopy allowed different fractions of asphaltenes for seeing that they are constituted by agglomerate particles, porous structures, and smooth surfaces.
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aTrejo, Fernando _940953
100	1		_aAncheyta, Jorge _938129
100	1		_aRana, Mohan S. _940954
999			_c169602 _d169602
856			_uhttp://pubs.acs.org/doi/full/10.1021/ef8005405