Super-deep fraction oil hydrodesulphurization catalyst and preparation method thereof

Abstract

The invention discloses a bulk phase super-deep hydrodesulphurization catalyst and a preparation method thereof. The catalyst comprises composite oxide NixWyOz, MoO3, alumina and SAPO-11 molecular sieve. The method comprises the following steps of: adding a proper amount of water-soluble nitrogen-containing compound in the precipitation process of Ni, W and Al, gelling, adding SAPO-11 molecular sieve liquid, ageing, pulping with the MoO3, and molding and activating to obtain the catalyst. The method improves the pore structure of the catalyst to expose more metal active sites on the surface of the catalyst, improves the utilization rate of active metals, and enables the SAPO-11 molecular sieve and the hydrogenation active metals to uniformly and fully contact and well match so as to achieve the effect of super-deep desulphurization of diesel oil. Moreover, because of the increment of aperture and pore volume of the catalyst, the Ni-W high active center is fully utilized, the complex big structural molecules are easier to contact the active center, and particularly the effect when the fraction oil with high macromolecule content is treated is more obvious.

Description

technical field [0001] The invention relates to a distillate oil hydrodesulfurization catalyst and a preparation method thereof, in particular to a bulk phase distillate oil ultra-deep hydrodesulfurization catalyst containing SAPO-11 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 ...

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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