Preparation method for hydrogenation pretreatment catalyst containing silicon aluminum-phosphorus aluminum composite molecule sieve

Abstract

The present invention discloses a preparation method for a hydrogenation pretreatment catalyst containing a silicon aluminum-phosphorus aluminum composite molecule sieve. According to the catalyst prepared by the method, a silicon aluminum-phosphorus aluminum composite molecule sieve, macroporous alumina and modified alumina form a carrier, one or a plurality of materials selected from group VIB metals and group VIII metals are adopted as active components, P2O5 is adopted as an auxiliary agent, a specific surface area of the catalyst is ??150-300 m<2> / g, and a pore volume is 0.30-0.60 cm<3> / g. According to the method, the silicon aluminum-phosphorus aluminum composite molecule sieve is introduced to regulate acid distribution of the catalyst, and the pH value of the impregnating solution is modulated to weaken acting force between the carrier and the metal, increase active center density, and reasonably match a hydrogenation activity center and an acid center of the catalyst. The catalyst prepared by the method provides an excellent aromatic ring hydrogenation saturation performance and C-N bond clearage capacity during a poor quality wax oil hydrotreating process so as to increase hydrogenation dearomatization and hydrogenation denitrogenation of the catalyst.

Description

technical field [0001] The invention relates to the field of hydrogenation treatment catalysts, in particular to a method for preparing a hydrogenation pretreatment catalyst containing silicon-aluminum-phosphorus-aluminum composite molecular sieves. Background technique [0002] As the world's petroleum resources become increasingly heavy and inferior, and petroleum fuel products become increasingly high-quality and clean, the development of high-efficiency conversion of heavy crude oil and clean oil production technology has become the top priority of today's petroleum processing industry. Hydrocracking technology is a comprehensive processing technology that integrates the lightening of heavy oil and the production of clean oil products. It has become the core technology of future oil processing and the main trend of vigorous development of refining and chemical enterprises. The core of the hydrocracking technology lies in the hydrocracking catalyst, and the catalyst conta...

AI Technical Summary

Problems solved by technology

Hydrogenation pretreatment catalysts usually use alumina as a carrier. However, due to the limitations of the pore size and surface acidity of alumina itself, the catalyst prepared solely as a carrier cannot achieve deep polycyclic aromatic hydrocarbon saturation and removal of heterocyclic nitrides. Modification of alumina

[0004] CN1769384A discloses a method for preparing a heavy oil hydrotreating catalyst, which is characterized in that a certain amount of Beta molecular sieve and alumina are used as a carrier together, and after impregnating the active component, the catalyst is prepared, but a strong acidic molecular sieve is added to modify the carrier, Although it increases the cracking activity of the catalyst, it also increases the amount of carbon deposition on the catalyst, which affects the long-term stable operation of the hydrotreating catalyst

However, a single introduction of molecular sieves cannot effectively match acid centers and hydrogenation centers. It is necessary to comprehensively modify the surface of the support and impregnate the active metals at the locked position to develop a high-activity hydrogenation pretreatment catalyst.

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