TY  - SER
AU  - Gómez-Cazalilla,M.
AU  - Infantes-Molina,A.
AU  - Mérida-Robles,J.
TI  - Chromium species as captors of sulfur molecules on nickel-based hydrotreating catalysts
PY  - 2009///
CY  - 
PB  - 
N2  - 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
ER  -