Gasoline selective hydrodesulfurization method

Abstract

The invention discloses a gasoline selective hydrodesulfurization method, which comprises the following steps: arranging two catalyst bed layers in a fixed bed reactor, filling a first catalyst bed layer with a sulfuration type hydrodesulfurization catalyst A and a second catalyst bed layer with a sulfuration type hydrodesulfurization catalyst B along the material flow direction, and allowing rawmaterial oil to sequentially pass through the catalyst bed layers and be subjected to a reaction under hydrodesulfurization reaction conditions to obtain a product, wherein based on the weight of thesulfuration type hydrogenation catalyst A, the weight content of MoS2 is more than 1 wt% and less than 11 wt%, and the weight content of Co9S8 is 0.1-7 wt%, based on the weight of the sulfuration typehydrodesulfurization catalyst B, the weight content of MoS2 is 11-20 wt%, and the weight content of Co9S8 is 0.1-7 wt%, and a catalyst filling volume ratio of the first bed layer to the second bed layer is 2 / 8-8 / 2. The method can effectively improve the activity and the selectivity of the gasoline hydrodesulfurization reaction, and is suitable for industrial application.

Description

technical field [0001] The invention relates to a gasoline selective hydrodesulfurization method. Background technique [0002] In recent years, in order to protect the environment, governments around the world have made great efforts to reduce the emission of harmful substances in the exhaust of internal combustion engines. The quality specifications of motor fuels have become increasingly stringent, especially requiring the reduction of sulfur content in motor gasoline. Combustion product SO of sulfur compounds in gasoline X It is one of the main harmful substances of automobile exhaust, and also one of the catalyst poisons of automobile exhaust conversion devices. Therefore, countries around the world have enacted legislation to impose stricter and stricter restrictions on the sulfur content in gasoline. [0003] As we all know, the sulfur content of straight-run gasoline is mainly related to the sulfur content of crude oil. Even though the sulfur content is high, due t...

AI Technical Summary

Problems solved by technology

The catalyst uses titania and / or zirconia-modified alumina as a carrier, P and K as additive components, and Co and Mo as active metal components. Although the selectivity of gasoline hydrodesulfurization has been improved to a certain extent, However, promoters P and K have a limited inhibitory effect on olefin saturation activity, so the hydrodesulfurization selectivity of this catalyst needs to be further improved

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