Regular carrier catalyst with desulfurization effect as well as preparation and application thereof

Abstract

The invention discloses a regular carrier catalyst with a desulfurization effect as well as preparation and application thereof. The regular carrier catalyst comprises a regular carrier and an activecoating attached to the surface of the regular carrier, wherein the active coating comprises a matrix containing IIA and IIB group metal oxides and a modified metal film attached to the outer surfaceof the matrix, the modified metal film comprises a modified metal, and the modified metal comprises one or more of Cr, Mo and W. The preparation method comprises the following steps: forming a mixturefrom metal powder, a hydroxyl-containing solvent and a surfactant, then treating the mixture under ultrasonic waves to obtain a mixed solution after the ultrasonic treatment; after the ultrasonic treatment, separating the mixed solution to obtain suspension; contacting the suspension with matrix particles, carrying out freeze drying to obtain matrix particles containing a modified metal film, andcoating the regular carrier with the matrix particles containing the modified metal film to obtain the regular carrier catalyst. The catalyst is used for hydrocarbon hydro-desulfurization, has high desulfurization activity and good stability, and can reduce the octane number loss of gasoline.

Description

technical field [0001] The invention relates to a modified molecular sieve used for hydrogen desulfurization, a preparation method and an application method thereof. Background technique [0002] Sulfur in hydrocarbon fuels burns to produce sulfur oxides, which can inhibit the activity of noble metal catalysts in automobile exhaust converters and cause them to be irreversibly poisoned, and cannot achieve catalytic conversion of toxic gases in automobile exhaust, thus Exhausted vehicle exhaust contains unburned non-methane hydrocarbons, nitrogen oxides and carbon monoxide. These toxic gases are easily catalyzed by sunlight to form photochemical smog and cause acid rain. Sulfur oxide itself is also one of the main causes of acid rain. [0003] Reducing the sulfur content of fuels such as gasoline and diesel is considered one of the most important measures to improve air quality. As people pay more and more attention to environmental protection, environmental protection regula...

AI Technical Summary

Problems solved by technology

Hydrodesulfurization reacts sulfur-containing hydrocarbons such as gasoline with hydrogen in the presence of a hydrogenation catalyst. With the increasingly stringent fuel standards, this requires more severe hydrogenation reaction conditions such as higher reaction pressure or temperature to make sulfur Lower levels, but due to the large amount of olefins in gasoline, increasing the hydrogenation severity will result in higher octane loss

Adsorption desulfurization is usually carried out by contacting the adsorbent with sulfur-containing hydrocarbons under the condition of hydrogen. First, the sulfur-containing hydrocarbons in the oil are captured on the adsorbent, hydrogenated to generate hydrogen sulfide, and then combined with zinc oxide to form sulfur-zinc compounds. , will also lead to a decrease in the octane number of gasoline products; in addition, when the sulfur bound on the zinc oxide reaches saturation, it will lead to a decrease in desulfurization activity, and the sulfur must be removed through oxidation regeneration. In the frequent oxidation regeneration-reduction process, the adsorbent The deactivation rate is high, which affects the implementation effect of sulfur-containing hydrocarbon desulfurization

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