Improved diesel oil hydrocracking catalyst carrier and preparation method thereof

Abstract

The invention discloses an improved diesel oil hydrocracking catalyst carrier and a preparation method thereof. Raw materials of the carrier comprise the following components in percentages by weight: 3-35% of a molecular sieve, 5-75% of gamma-Al2O3, 15-75% of amorphous silica-alumina and 7-40% of an adhesive; the specific surface area of the carrier is 200-450m<2> / g, and the total pore volume is 0.35-0.75cm<3> / g. In a process of preparing a molecular sieve and aluminum oxide compound material, the molecular sieve without a template is added. In a mixed liquid, NH4<+> generated by ammonia salt and ammonia water and alkali Na<+> balancing negative charges of a molecular sieve framework exchange; in a roasting process, an organic template in the molecular sieve and NH4<+> are removed, so that ammonium exchange and template removal of a zeolite molecular sieve in a process of preparing the compound material are realized without independently using the molecular sieve for ammonium exchange and template removal. The template plays supporting and protecting roles on a dust structure of the molecular sieve. The hydrocracking catalyst carrier prepared by the carrier can remarkably reduce the condensation point of a diesel fraction and improve the cetane number of the diesel oil on the premise of guaranteeing a high yield of diesel oil.

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 economic development and the rapid growth of demand for petroleum products, my country's hydrocracking processing capacity has also developed rapidly. However, as the quality of processing feedstock oil in my country has gradually become heavier and worse, the processing volume of high-sulfur crude oil has increased year by year. Environmental protection has increasingly strict requirements on the refining process itself and the quality of petroleum products, which places 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 hydrocracking catalysts ma...

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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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