Preparation method of hydrogenated process catalyst

Abstract

A process for preparing the hydrocatalyst with high pore volume and specific surface area includes such steps as codepositing of the solution of metallic compounds, dewatering, pulverizing to obtain the main body of catalyst, sufficiently contacting with the ammonium compound of fluorine to make the fluorine to be combined with said main body of catalyst and adsorb the released ammonia by the millipores of catalyst powder, adding acidic solution or acidic adhesive, shaping, drying and calcining.

Description

technical field [0001] The invention relates to a preparation method of a hydrogenation treatment catalyst, in particular to a preparation method of a hydrogenation treatment catalyst containing auxiliary agent fluorine. Background technique [0002] Crude oil and distillates derived from crude oil contain impurities such as sulfur, nitrogen, oxygen and metals. The existence of these impurities not only affects the stability of the oil, but also emits SO during use. X , NO X and other harmful gases pollute the environment. During the secondary processing of oil products, the presence of impurities such as sulfur, nitrogen, oxygen and metals can poison catalysts. Distillate oil hydrotreating refers to the process of contacting raw oil and hydrogen with a catalyst at a certain temperature and pressure to remove impurities and saturate aromatics. [0003] A hydrotreating catalyst with excellent performance must have excellent hydrogenation activity and certain cracking acti...

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Problems solved by technology

[0005] Although the method for preparing catalyst by co-precipitation method described above can prepare highly active catalyst, the pore volume and specific surface area of ​​the catalyst prepared by this method are very low. In addition, the metal precipitate obtained by the above method cannot be directly applied to existing There are industrial devices, they must go through a molding step to make granular catalysts before they can be used in industrial devices, and their pore volume and specific surface area will be further reduced during the molding process

Although extreme conditions can be used to prepare catalysts with higher pore volume and specific surface area, metals with low or no hydrogenation activity (such as chromium) need to be used at this time, which will lead to a reduction in active metal content and molybdenum (or Tungsten) nickel atomic ratio is severely mismatched, which reduces the activity of the catalyst, while making a large amount of metals not well utilized

The pore volume and specific surface area of ​​the catalyst will reduce the reaction contact area, the utilization rate of active metals will decrease, and the ability of the catalyst to accommodate impurities will decrease, especially when processing heavy oil, the stability of the catalyst will become worse

Adding support materials during the molding process can increase the pore volume and specific surface area of ​​the catalyst, but since the support is basically inactive, the addition of support materials inevitably loses catalyst activity