PETR 19 |
| A number of recent papers are dedicated to explain the benefits of new HDS catalyst and the potential modifications in the units that will help to achieve the 15 ppm sulfur content target Limited amount of literature and catalyst design are focused in solving the aromatic problem, mainly when cracked diesel component (LCO and LKGO) need to be incorporated into the pool. About two times more active catalysts are required to reduce density, poly-aromatics content and improve cetane number for a premium diesel fuel production. This paper deals with the characterization of a new WNiPd/TiO2-alumina catalyst [1] that was performed by XPS, pyridine (FTIR), ammonia (TPD) and by testing the hydrogenation and ring opening function by chemical reactions. The catalyst activity and selectivity were measured in a small bench scale hydrotreating unit using as feed a blend of naphthalene, tetralin, decaline and dibenzothiophene in decane at different temperatures. The products analysis were carried out by GC-MS, HRMS, and HNMR techniques. The surface characterization indicated that the catalyst is composed by a highly dispersed -WNi- clusters surrounded by -Pd- nano-particles and a medium strength acid sites. The catalyst testing with the synthetic blend shows the presence of highly active hydrogenating and isomerizating functions, and a modest cracking and hydrogenolizing function in comparison with standard NiMo/Al2O3 catalyst. The new catalyst favors the naphthenic ring opening reactions into a high molecular weight isoparafins. This behavior is associated to the type of acid sites present on surface that were characterized by pyridine and ammonia adsorption. [1] R Galiasso T and Juan Ravigli T. “Catalyst for ultra low sulfur and aromatic diesel”, Appl. Catal. A: Gen. 282, 1-2, (2005), 227-235 |
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2nd International Symposium on Hydrotreating/Hydrocracking Technologies
1:30 PM-4:30 PM, Sunday, 10 September 2006 Palace -- Presidio Room, Oral
Division of Petroleum Chemistry |