Super deep hydrodesulfurization catalyst and preparation method thereof

Abstract

The invention discloses a super deep hydrodesulfurization catalyst and a preparation method thereof. The catalyst comprises a composite oxide (NixWyOz), MoO3, aluminum oxide, a type-Y molecular sieve. The method comprises: adding a proper amount of water soluble nitride in a Ni, w and Al precipitation process; after gelatin is formed, adding type-Y molecular sieve slurry; aging and beating with MoO3; and forming and activating. When the method is used, the porous structure of the catalyst is improved, more metal active sites are exposed from the surface of the catalyst, the utilization rate of active metals is improved, the type-Y molecular sieve and metals having hydrogenation activity are uniformly and fully contacted and well combined, and the effect of super deep hydrodesulfurization of diesel is achieved. In addition, the aperture and pore capacity of the catalyst are increased, so a Ni-W high-activity center is fully used, it is easier for complex macromolecules to contact the active center, and the effect is more obvious particularly when the catalyst is used for processing distillates with high macromolecule content.

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 Y 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, which is...

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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