Catalyst deactivation during LCO upgrade to high - quality diesel Roberto
نویسنده
چکیده
Diesel fuels of 50 and 15 ppm of sulfur content were produced in a pilot plant by upgrading light catalytic cracking gas oil (LCO) during 10 weeks of continuous operation. The end-of-run catalysts were characterized before and after soluble coke extraction by CH2Cl2. The cokes were characterized by CNMR, TPO, GC-MS, and elemental analysis. Catalyst surfaces were characterized by XPS, CO adsorption, pyridine adsorption, and chemical reactions. The results indicate important differences in amount and composition of the soluble type of coke on the two deactivated catalysts. Soluble coke differently affected the accessibility to the catalyst actives sites in both samples. Catalyst deactivation is higher and ring opening reaction rate lower with greater hydrotreating severity used to achieve 5 ppm instead of 50 ppm of sulfur. Keyword: LCO upgrading, low aromatic diesel, catalyst deactivation, WNiPd/TiO2Al2O3
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