Beta zeolite-containing ultradeep hydrodesulfurization catalyst and preparation method thereof

Abstract

The invention discloses a bulk phase deep hydrodesulfurization catalyst and a preparation method thereof. The components of the catalyst comprise a composite oxide (NixWyO2), MoO3, aluminum oxide and beta zeolite. The method comprises: adding a proper amount of water soluble nitrogen compound in a precipitation process of Ni, W and Al, gelatinizing, adding beta zeolite size, aging, pulping with MoO3, forming and activating. The method improves the porous structure of the catalyst, makes more metal active spots exposed from the surface of the catalyst, improves the utilization rate of active metals, and makes beta zeolite and metal having hydrogenation activity uniformly and fully contacted and better cooperated to realize ultradeep hydrodesulfurization of diesel. In addition, the increase in the aperture and pore volume of the catalyst allows a Ni-W active center to be fully utilized and molecules with complex large structures to contact the active center more easily, and the effect is more obvious particularly when distillate with high-macromolecule content.

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 deep hydrodesulfurization catalyst containing beta zeolite and a preparation method thereof. Background technique [0002] Since the combustion of sulfur-containing 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 limit on sulfur content. The US Environmental Protection Agency has lowered the diesel sulfur content standard to 15ppm in June 2006. Among the various desulfurization technologies for diesel, the most mature is the hydrodesulfurization technology. Methods to achieve deep desulfurization include developing new reactors and new catalysts. Kinetic studies have shown that to reduce the sulfur content of diesel from 500 ppm to below 15 ppm, the reactor volume must be...

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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