Preparation method of catalytic cracking flue gas desulfurization agent

Abstract

The invention provides a preparation method of a catalytic cracking flue gas desulfurization agent. The preparation method provided by the invention comprises the following steps: dipping cerium ion active components on a granular carrier under a certain condition, adding alumina sol and / or silica sol, drying, and roasting to obtain a semi-finished product, wherein the active components can be better dispersed on the carrier; simultaneously, more acid centres can be formed in the carrier; and the reaction activity is increased; and then, dipping magnesium ion active components on the semi-finished product, drying, and roasting to obtain the desulfurization agent. According to the invention, the cerium ion active components are dipped at first; the magnesium ion active components are dipped after alumina sol and / or silica sol are / is added; therefore, the cerium active components are sufficiently dispersed in an aluminium oxide porous channel; the magnesium active components form a clad layer outside the cerium active components; in the event of desulfurizing, desulfurization reaction is carried out in different levels; the desulfurization activity is higher; the transfer rate of SOx in flue gas is high; and the desulfurization agent is long in service life.

Description

technical field [0001] The invention relates to a preparation method of catalytic cracking flue gas desulfurization additive, which belongs to the technical field of chemical catalysts. Background technique [0002] Catalytic cracking is one of the important processes of petroleum secondary processing. In the process of catalytic cracking, the catalyst is circulated between the reactor and the regenerator. When leaving the reactor, the catalyst contains about 3-10wt% coke. At this time, the deposited coke needs to be burned off in the regenerator with the help of oxygen in the air to restore the catalytic activity of the catalyst and realize the regeneration of the catalyst. [0003] As the content of sulfur and nitrogen heteroatoms in crude oil increases, the sedimentary coke also contains sulfur and nitrogen. When the catalyst is regenerated in the regenerator under oxygen-enriched conditions, the deposited coke and oxygen undergo a combustion reaction to generate regener...

AI Technical Summary

Problems solved by technology

However, the magnesium active component and the cerium active component in the desulfurization aid prepared by the above method are prone to mutual wrapping, and the active center is covered, so the above desulfurization aid is used for catalytic cracking of SO in flue gas. x When the removal treatment is carried out, its oxidation activity and reduction activity are low, and the SO in the flue gas x The transfer rate is low

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