Preparation method of catalytically cracked gasoline hydrodesulfurization catalyst containing nanocrystalline multi-stage duct ZSM-5 molecular sieve

Abstract

The invention relates to a preparation method of a catalytically cracked gasoline hydrodesulfurization catalyst containing a nanocrystalline multi-stage duct ZSM-5 molecular sieve. The catalytically cracked gasoline hydrodesulfurization catalyst mainly consists of the following components in percentage by weight: 5-30% of active components, 4-9% of an active component auxiliary, 1-5% of a modifying agent and 60-90% of carriers, wherein the active components comprise at least one of Mo and W metal elements; the active component auxiliary comprise at least one of Co and Ni elements; the modifying agent is one of metals La and Ce, or the compounding of the metal La and Ce; the carriers are composite carriers using aluminum oxide and an NCMZ molecular sieve as main bodies. According to the invention, through the unique framework and duct structure of the NCMZ molecular sieve, the advantages of a micropore ZSM-5 molecular sieve and the advantages of mesoporous materials are combined, so that the reaction efficiency is further improved, and increasing product quality is finally realized. The FCC gasoline hydrodesulfurization catalyst disclosed by the invention can enable a reaction to be carried out under more moderate conditions.

Description

technical field [0001] The invention relates to a catalytic cracking (FCC) gasoline hydrogenation desulfurization catalyst and a preparation method thereof. Background technique [0002] With the continuous enhancement of people's awareness of environmental protection, the pollution caused by automobile exhaust has become the focus of people's attention. Sulfur in fuel oil products (especially vehicle fuel oil) is one of the important causes of urban pollution. In order to control the air pollution caused by vehicle exhaust emissions, people have done a lot of work on the low-sulfurization of fuel oil products. Governments around the world are increasingly aware of the importance of deep desulfurization of fuel oil. Developed countries such as Europe and the United States have successively promulgated a The new standards for the cleanliness of a series of petroleum products, the limitation of sulfur content is one of the important contents. In the total domestic gasoline, ...

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Problems solved by technology

[0006] CN2005102000948 reports a catalyst prepared by a composite molecular sieve mechanically mixed with mesoporous molecular sieves and microporous molecular sieves. The catalyst has hydrodesulfurization and hydrocracking activities, but the activity and selectivity are not high

[0007] CN103349995A discloses a hydrodesulfurization catalyst prepared with a mesoporous composite molecular sieve ZSM-5 / KIT-1 as a carrier. The catalyst has a large specific surface area, rich pores, high dispersion of metal active components, and mild hydrodesulfurization reaction conditions , but its desulfurization efficiency needs to be improved

But there is no report on the use of mesoporous ZSM-5 molecular sieves as FCC gasoline hydrodesulfurization catalysts

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