01801nab a2200193 4500 20260520000815.0 260224s2009 xxu Chromium species as captors of sulfur molecules on nickel-based hydrotreating catalysts ene. 2009 14/04/2009 ; 14/04/2009 9 p. ; 101-110 Transcripción 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. Energy & fuels 23 ARTICULO Gómez-Cazalilla, M. 40841 Infantes-Molina, A. 40842 Mérida-Robles, J. 40843 169546 169546 0 0 0 0 237365 BAAB BAAB 2026-03-05 200044348 0 200044348 2026-03-05 15:11:45 2026-03-05 ARTICULO