Hydrocracking catalyst and preparation method thereof

Abstract

The invention discloses a hydrocracking catalyst and a preparation method thereof. The catalyst is prepared by a carbonization method and is amorphous silica aluminum subject to hydro-thermal treatment. The amorphous silica aluminum prepared by the method has the characteristics of large specific surface, large pore volume, centralized pore distribution and appropriate acidity; an enough channel is provided for reactants, the reactants and products are convenient to enter / exit, the active ingredients of the carrier are greatly increased, and the distribution uniformity of the acid centre in the pore channel is improved; and moreover, as a larger space and a specific surface are provided for loading metal, the hydrogenated metal has higher dispersibility, the metal utilization rate is improved, and the catalyst provided by the invention has appropriate cracking activity as well as high hydrogenation activity and medium oil selectivity. The catalyst provided by the invention is particularly suitable for finishing the single-stage hydrocracking process once.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and a preparation method thereof, in particular to a hydrocracking catalyst containing amorphous silicon-aluminum for processing heavy hydrocarbon raw materials and producing middle distillate oil and a preparation method thereof. Background technique [0002] As one of the main means of lightening heavy oil, hydrocracking technology has the advantages of strong feedstock adaptability, good product quality, high yield of middle distillate oil, and high added value of tail oil. It has become more and more important in the modern oil refining industry. more and more important. [0003] The hydrocracking catalyst is a dual-function catalyst that contains both an acidic component and a hydrogenation component. Hydrogenation activity is generally provided by metals of Group VIB and Group VIII in the periodic table of elements; and sources of acidity include supports such as zeolites and inorganic oxides, an...

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Problems solved by technology

[0004] GB2166971 discloses a method for preparing amorphous silicon-alumina, which is prepared by mixing alkali metal aluminate and silicate at pH 12-12.5, and then reacting with aluminum sulfate. The silicon content can reach about 35%, but Its disadvantage is that the pore volume and specific surface area are not high, and the silica-alumina used as a carrier catalyst cannot provide higher metal dispersion for active components.

In addition, the preparation of this patent is characterized by the rapid mixing of pumps to form gels, which requires high equipment and is difficult to produce, with certain limitations.

[0005] CN1210755A discloses a kind of amorphous silicon aluminum and its preparation method, its silicon oxide content is 10~50wt%, specific surface is 350~600m 2 / g, pore volume 0.8~1.5ml / g, infrared acidity 0.25~0.55mmol / g, its preparation process is NH 3 ·H 2 O and alumina first form alumina and then decompose silicate, which will produce ammonia and nitrogen-containing wastewater and pollute the environment

[0011] CN 1597093A discloses an amorphous silicon aluminum prepared by carbonization method, containing 8wt%-50wt% of silicon oxide, and the specific surface is 300-550m 2 / g, the pore volume is 0.7-1.5ml / g, and the infrared acidity is 0.32-0.50mmol / g. The disadvantage is that there are many strong acids and relatively few L acids, which will cause excessive cracking of the catalyst, which is not conducive to the selectivity of the catalyst. have to improve

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