Catalyst for hydrogen desulfurization of catalytic cracking gasoline and preparation method of catalyst

Abstract

The invention discloses a catalyst for hydrogen desulfurization of catalytic cracking gasoline and a preparation method of the catalyst. The catalyst comprises the following components based on mass of oxides: 78.0-94.0wt% of an alumina supporter of a macroporous structure, 2.0-10.5wt% of an active ingredient cobalt oxide and 2.5-15.0wt% of molybdenum oxide, wherein the supporter takes chitosan as a pore-enlarging agent. The hydrogen desulfurization catalyst is low in octane loss and high in desulfurization rate.

Description

technical field [0001] The invention relates to a catalyst for hydrodesulfurization of catalytic cracking gasoline and a preparation method thereof. Background technique [0002] Because catalytic cracking gasoline generally has a sulfur content of 100-500v%, there are even high-sulfur and high-olefin feed oils with a sulfur content of more than 500 mg / kg and an olefin content of more than 40%. Selective hydrodesulfurization technology will inevitably cause partial saturation of olefins and lower octane number during deep hydrodesulfurization, which requires hydrodesulfurization catalyst to desulfurize while avoiding excessive loss of octane number as much as possible. [0003] Due to their large pore structure, high specific surface area, and good thermal stability, macroporous oxides are widely used in heterogeneous catalysts, catalyst supports, adsorption and separation materials, chromatographic packing, electrode materials, acoustic and thermal resistance materials and...

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Problems solved by technology

The disadvantage is that the size of the macropore (300nm or 400nm) is completely determined by the size of the polystyrene droplet introduced twice, that is, the size of the macropore depends on the size of the polystyrene droplet

The pore size cannot be adjusted by partially changing the components of the solution itself and the interaction of organic molecules in the system

Huining Li et al. (Inorganic Chemistry, 2009, 48:4421) also used the sol-gel method to introduce polymethyl methacrylate (PMMA) droplets with a single dispersed phase into the mixed solution using F127 as a template to achieve large Pore-the formation of macropores in mesoporous alumina, the disadvantage is that the size of the macropores is completely determined by the size of the secondary introduction of polymethyl methacrylate droplets, which cannot be achieved by partially changing the components of the solution system itself The adjustment of the pore size is used to realize the formation of the macropore-mesopore composite pore structure, so it is impossible to realize the controllable adjustment of the macropore-mesopore diameter. In the process of use, especially for the macromolecular catalytic process of complex components limitations

The solubility of polyvinyl alcohol templates in water is affected by the degree of polymerization, which leads to certain restrictions on their use in the preparation of super-porous alumina

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