Improved diesel hydrocracking catalyst carrier and preparation method thereof

Abstract

The invention discloses an improved diesel hydrocracking catalyst carrier and a preparation method thereof. The carrier raw materials include the following components and weight percentages: 3-35% molecular sieve, 5-75% γ-Al 2 O 3 , 15-75% amorphous silicon aluminum and 7-40% binder; the specific surface area of ​​the carrier is 200-450m 2 / g, the total pore volume is 0.35~0.75cm 3 / g. In the present invention, in the process of preparing the molecular sieve and alumina composite material, a molecular sieve that does not release the template is added. In the mixed liquid, the NH4 generated by the reaction of the aluminum salt and ammonia water is + In exchange with the alkali Na+ that balances the negative charge of the molecular sieve skeleton, during the roasting process, the organic template agent and NH in the molecular sieve are 4 + removal, thereby completing the ammonium exchange and template release of the zeolite molecular sieve during the preparation of composite materials. There is no need to separately perform the template release agent and ammonium exchange on the molecular sieve. The template agent has a supporting and protective effect on the molecular sieve channel structure. It is prepared with this carrier The hydrocracking catalyst can significantly reduce the freezing point of the diesel fraction and increase the cetane number of the diesel while ensuring a high yield of diesel.

Description

technical field [0001] The invention relates to a catalyst carrier, in particular to an improved diesel hydrocracking catalyst carrier and a preparation method thereof. Background technique [0002] With the rapid development of the economy, the demand for petroleum products has grown rapidly, and my country's hydrocracking processing capacity has also achieved rapid development. However, as the quality of raw oil processed in my country gradually becomes heavier and worse, the processing volume of high-sulfur crude oil is increasing year by year, and environmental protection has increasingly strict requirements on the refining process itself and the quality of petroleum products, which put forward higher requirements on the level of hydrocracking technology , while the catalyst plays a central role in the hydrocracking reaction, the key to the hydrocracking technology lies in the development and improvement of the catalyst. [0003] The conventional preparation methods of h...

AI Technical Summary

Problems solved by technology

CN1393521A discloses a medium-oil type hydrocracking catalyst and its preparation method. The carrier used in the catalyst is amorphous silica-alumina, composite molecular sieve of alumina, Y and β molecular sieve, wherein the composite molecular sieve is to burn off the former powder of β molecular sieve to remove template After mixing with modified Y molecular sieve, it is obtained by ammonium exchange treatment. The catalytic activity of this catalyst is not high, and the product quality of middle distillates of jet fuel and diesel oil is average, which needs to be further improved.

However, the above-mentioned hydrocracking catalyst carrier components are simply mechanically mixed, and the components in the catalyst are easily agglomerated into secondary particles, which makes the dispersion of the active components poor, and the prepared catalyst is difficult to exert the best performance.

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