Superdeep hydrodesulfurization catalyst and preparation method thereof

Abstract

The invention discloses a bulk phase superdeep hydrodesulfurization catalyst and a preparation method thereof. The catalyst comprises NixWyOz which is a composite oxide, MoO3 and aluminum oxide and microporous and mesoporous composite molecular sieves. The method comprises the following steps of: adding proper quantity of water-solubility nitrogenous compounds in the precipitation process of Ni, W and Al, gelatinating, adding serous fluid of the composite molecular sieves, aging, beating the mixture with the MoO3, and forming and activating to prepare the bulk phase superdeep hydrodesulfurization catalyst. By the method, a pore structure of the catalyst is improved, so that more metal active sites are exposed from the surface of the catalyst to improve the utilization rate of active metal, and the composite molecular sieves contact the hydrogenated active metal uniformly and better coordinate with the hydrogenated active metal to produce the performance of the composite molecular sieves fully and achieve the effect of superdeep desulfuration of diesel oil, and particularly, the effect of processing macromolecular distillate with more content is more obvious.

Description

technical field [0001] The invention relates to a hydrodesulfurization catalyst and a preparation method thereof, in particular to a distillate oil ultra-deep hydrodesulfurization catalyst containing a composite molecular sieve and a preparation method thereof. Background technique [0002] Since the combustion of sulfur compounds in fuels will cause serious harm to the world's environment and society, the standards for clean fuels formulated by countries around the world have greatly increased the restrictions on sulfur content. The U.S. Environmental Protection Agency has lowered the diesel sulfur content standard to 15ppm in June 2006. Among various desulfurization technologies for diesel, the most mature one is hydrodesulfurization technology. Ways to achieve deep desulfurization include the development of new reactors and new catalysts. Kinetic studies have shown that to reduce the sulfur content of diesel from 500ppm to below 15ppm, the reactor volume must be tripled...

AI Technical Summary

Problems solved by technology

4,6-Dimethyldibenzothiophene sulfide is usually the most difficult type of sulfide to remove, because the methyl group next to the sulfur atom creates steric hindrance between the sulfur atom and the active center of the catalyst, Sulfur atoms are not easy to access the active center of the reaction, which leads to a significant decrease in the reaction rate

In the prior art, only emphasis is placed on the type and content of metals and the coordination and cooperation between different metals. How to make the catalyst have a reasonable pore structure and a high content of active metal components to fully play their role, and how to make the acidic components in the catalyst Combined with active metals reasonably, how to make the catalyst have better hydrogenation activity at the same metal content has not been involved

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