A kind of pyrolysis gasoline hydrotreating catalyst and its preparation method

Abstract

The invention relates to a pyrolysis gasoline hydrogenation catalyst. The catalyst uses molybdenum, cobalt, nickel, and strontium as active components, and uses silicon oxide-alumina as a carrier. Based on the total weight of the catalyst, the catalyst includes 9-19 wt% of molybdenum oxide , 3.0-8.5wt% cobalt oxide, 0.2-3.5wt% nickel oxide, 0.1-2.0wt% strontium oxide, silica-alumina carrier content of 75-85wt%, micropores, mesopores and macropores in the carrier Uneven distribution. The catalyst has good anti-colloid ability, strong anti-arsenic, anti-sulfur, and strong anti-water ability.

Description

technical field [0001] The invention relates to the field of oil refining and chemical industry, and relates to a pyrolysis gasoline hydrotreating catalyst and a preparation method thereof. Background technique [0002] With the improvement of ethylene production capacity, ethylene by-product pyrolysis gasoline also increases, and pyrolysis gasoline includes C5-C10 fractions. In the prior art, two-stage hydrogenation technology is generally used for the treatment of pyrolysis gasoline fractions. The first stage of pyrolysis gasoline is selective hydrogenation, and the purpose is to generate active components (such as alkynes, diolefins and alkenyl aromatics) therein. Corresponding monoolefins and alkyl aromatics, use noble metal hydrogenation catalysts or non-noble metal Ni-based catalysts to saturate these active unsaturated components in oil products at lower temperatures to reduce coking in the second-stage catalyst bed, thereby To ensure the operating cycle of the devic...

AI Technical Summary

Problems solved by technology

CN1353168A discloses a catalyst suitable for the second-stage hydrofining of pyrolysis gasoline and its preparation method. The alumina precursor is used to add a high polymer and the IV subgroup metal to obtain a molded carrier after drying and roasting. Immerse in ammonia co-impregnation solution containing Mo, Co, and Ni active components, dry at 100-120°C, and activate at 400-700°C in air to obtain a catalyst, which can adjust the acidity and alkalinity of the carrier and inhibit the coking and deactivation speed of the catalyst. The low specific surface area of ​​the carrier leads to low hydrogenation activity of the catalyst