Modified molecular sieve for hydro-desulfurization as well as preparation and application thereof

Abstract

The invention discloses a modified molecular sieve for hydro-desulfurization as well as preparation and application thereof. The modified molecular sieve comprises a molecular sieve and a modifying metal film positioned on the outer surface of molecular sieve particles, wherein the modifying metal film contains one or more first modifying metals selected from Fe, Co, Ni and Mn and optional B. Thepreparation method of the modified molecular sieve comprises the following steps: forming a mixture from 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; separating the mixed solution after the ultrasonic treatment to obtain suspension, mixing the suspension with a molecular sieve, and carrying out freeze-drying to obtain the modified molecular sieve. The modified molecular weight is used for hydro-desulfurization of sulfur-containing hydrocarbons, has high activity and stability, can obviously reduce the olefin content, increase the iso-hydrocarbon content and increase the octane number of gasoline when used for gasoline desulfurization, and has a high gasoline yield.

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. The sulfur oxides produced by vehicle fuels will inhibit the activity of noble metal catalysts in automobile exhaust converters and cause irreversible poisoning, and catalytic conversion of toxic gases in automobile exhaust cannot be achieved. The role of gas, so that the exhaust of vehicles contains unburned non-methane hydrocarbons, nitrogen oxides and carbon monoxide. These toxic gases are easily catalyzed by sunlight to form photochemical smog, causing acid rain, and sulfur oxide itself is also the main cause of acid rain. one. [0003] Reducing the sulfur content in gasoline and diesel is considered one of the most important measures to improve air quality. As people pay more and more attention to environmental prote...

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

Images