A kind of multilevel porous hydrocracking catalyst containing silicon and aluminum and its application

Abstract

The invention provides a multilevel-pore hydrocracking catalyst containing aluminum silicon and application of the catalyst. The catalyst contains a carrier and a hydrogenation active metal component loaded on the carrier, the carrier contains a Y-shaped molecular sieve, weakly acidic aluminum silicon and aluminum oxide, and the hydrogenation active metal component is selected from molybdenum and / or tungsten of the VIBth group and nickel and / or cobalt of the VIIIth group. The multilevel-pore hydrocracking catalyst is characterized in that pore distribution of the catalyst meets the requirements that the volume of pores with the pore diameter smaller than 2 nm accounts for 2-50% the total pore volume of the catalyst, the volume of pores with the pore diameter ranging from 2 nm to 100 nm accounts for 20-85% the total pore volume of the catalyst, and the volume of pores with the pore diameter larger than 100 nm accounts for 3-7% the total pore volume of the catalyst. Compared with the prior art, the catalyst has higher hydrocracking activity.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and its application. Background technique [0002] Industrial hydrocracking feedstocks include VGO and other 350-540°C fractions. The heavy fraction has a large molecular weight and requires a catalyst to provide a large pore space. The pore space of the supported catalyst is mainly determined by the carrier, which requires increasing the pore size of the carrier to improve the contact of reaction molecules. ability to hydrogenate active metals within the catalyst. Due to the small pore volume of molecular sieves and metal sulfides, especially the lack of medium and large pores that meet the requirements of macromolecular hydrocarbon feedstocks required by petroleum processing, conventional methods can introduce large pore volume heat-resistant inorganic oxides into the hydrocracking catalyst carrier. Substrate method to achieve, for example, the introduction of alumina matrix. [0003] ZL01123765.1 A...

AI Technical Summary

Problems solved by technology

The alumina preparation process adopts a two-step aging method for preparation. Since the treatment conditions in the aging process are generally harsh, it will reduce the active hydroxyl groups on the surface of the alumina precursor, change the interaction between the metal carrier and the catalyst. The pore distribution reduces the reactivity of the catalyst

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