000			01801nab a2200193 4500
005			20260520000815.0
008			260224s2009 xxu
245	0	0	_aChromium species as captors of sulfur molecules on nickel-based hydrotreating catalysts
260			_a _b _cene. 2009
270			_a14/04/2009 ; 14/04/2009
300			_a9 p. ; 101-110
520			_aTranscripción del resúmen publicado por el autor: Three nickel-chromium catalysts supported on aluminated mesoporous silica (SBA-15) were prepared with a fixed nickel loading of 15 wt % and differing chromium contents, which ranged between 2.6 and 5.2 wt %. They were tested in the hydrotreating of tetralin in the presence of dibenzothiophene (DBT). Moreover, a monometallic nickel catalyst was also prepared and tested, for comparison. Information regarding the structure of the calcined, reduced, and used catalysts was obtained by several physical-chemical techniques such as X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H2-TPR), temperature-programmed desorption of ammonia (NH3-TPD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and elemental chemical analysis. The presence of small amounts of Cr3+ ions not only modifies the nickel dispersion, leading to the formation of a more active catalyst in the hydrogenation of tetralin, but also has a strong influence on the stability of these catalysts in the presence of 425 ppm DBT in the feed. The Cr3+ ions seem to act as a sulfur trap, thus preventing sulfur poisoning of nickel particles.
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aGómez-Cazalilla, M. _940841
100	1		_aInfantes-Molina, A. _940842
100	1		_aMérida-Robles, J. _940843
999			_c169546 _d169546