High-activity amorphous silica-alumina, hydrocracking catalyst supported by amorphous silica-alumina, and preparation methods thereof

Abstract

The invention discloses a high-activity amorphous silica-alumina, a hydrocracking catalyst supported by amorphous silica-alumina, and preparation methods thereof. The preparation method of the amorphous silica-alumina supporter comprises the following steps: preparing a silicon source-aluminum source mixed water solution, mixing the mixed water solution with a precipitant solution, carrying out cocurrent flow coprecipitation to obtain a precipitated slurry, transferring the slurry into a closed vessel, aging, molding, and roasting. The invention also provides a preparation method of a hydrocracking catalyst by using the amorphous silica-alumina as the supporter. The preparation method of the hydrocracking catalyst is as follows: in the preparation method of the amorphous silica-alumina supporter, a nickel salt or nickel salt and metal aid M salt is / are added into the silicon source-aluminum source mixed water solution in the step (1), and the rest steps are the same as those in the preparation method of the amorphous silica-alumina supporter. The coprecipitation process is adopted in the preparation process, and the silicon source and aluminum source finally exist in the catalyst in the form of the amorphous silica-alumina, but the catalyst has much higher activity than the common amorphous silica-alumina catalyst.

Description

technical field [0001] The invention relates to a high-activity amorphous silicon-aluminum catalyst, a hydrocracking catalyst using it as a carrier and a preparation method thereof, belonging to the field of oil product processing. Background technique [0002] FT synthetic oil is sulfur-free, nitrogen-free, and aromatic-free. It is mainly composed of paraffins and olefins with different carbon numbers, and most of the olefins are alpha olefins. The carbon number distribution of FT products is relatively wide, and the highest can exceed one hundred. FT synthetic intermediate products are suitable for processing and producing high-quality diesel oil, aviation kerosene, naphtha, etc. Converting FT heavy hydrocarbons into diesel and aviation kerosene through hydrocracking process is one of the more important technologies in FT product processing technology, and the performance of hydrocracking catalyst directly affects the yield and quality of target products. [0003] The hy...

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Problems solved by technology

[0005] Chinese patent application (CN1597093A) discloses an amorphous silicon-alumina prepared by carbonization, containing 8wt%-50wt% of silicon oxide, and a specific surface of 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 more strong acids and relatively less L acids, which will cause excessive cracking of the catalyst, which is not conducive to the selection of middle distillate oil for catalysts. sexual enhancement

FT intermediate products are sulfur-free, and the use of sulfurized catalysts will cause sulfur-containing impurities in the product, making the product unable to meet the content standards required by the state

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