| 摘要 |
FIELD: petroleum processing and catalysts. ^ SUBSTANCE: field of invention is production of catalysts for catalytic hydrotreatment (desulfurization) of gasoline fractions, e.g. straight-run gasoline. Herein disclosed is block-type high-porosity cellular catalyst for hydrotreatment of straight-run gasoline having porosity at least 90-93% and microporosity up to 30%, average pore size being ranging from 0.5 to 2.0 mum. Catalyst consists of alpha-alumina-based carrier and active catalyst portion containing sulfated zirconium dioxide and metallic palladium in concentration 0.5-0.9 wt %. Catalyst preparation method is also claimed and is as follows. Carrier is prepared from reticular polyurethane foam and impregnated with slurry containing more than 30 wt % alpha-alumina, after which calcined at 1300-1500°C, impregnated with water-soluble zirconium salts, dried at 100-200°C, calcined at 450-950°C, treated with 5-10% sulfuric acid, dried, calcined at 500-550°C, treated with palladium nitrate, dried, and calcined at 400-450°C, whereupon palladium oxide is reduced to metallic palladium. ^ EFFECT: lowered pressure and temperature of hydrotreatment process, considerably reduced process duration, lowered sulfur level in straight-run gasoline due to developed surface of catalyst, and prevented crumbling and loss of catalyst due to cellular structure and high strength. |
