Regeneration method of thallium poisoned denitration catalyst

Abstract

The invention discloses a regeneration method of a thallium-poisoned denitration catalyst, and relates to the technical field of denitration catalysts. The regeneration method comprises the following steps: (1) removing accumulated dust on the surface of the thallium-poisoned denitration catalyst, and dredging pore channels; (2) soaking the catalyst in deionized water, adding a foaming agent and a collecting agent, and performing ultrasonic bubbling treatment; (3) soaking in a cleaning solution and performing ultrasonic treatment, wherein the cleaning solution comprises a mixed solution of dilute sulphuric acid, an oxidizing agent and a complexing agent; (4) cleaning to remove the cleaning solution and a thallium-containing solution on the surface of the catalyst; (5) drying the catalyst in the step (4), and then performing pore expansion; (6) immersing in active liquid; and (7) roasting after drying to complete the regeneration of the thallium poisoned denitration catalyst. The regeneration method disclosed by the invention has the beneficial effects that by adopting the regeneration method disclosed by the invention, the activity of the regenerated catalyst is remarkably recovered, and the denitration efficiency of the optimal catalyst at 290 DEG C reaches 97% or above.

Description

technical field [0001] The invention relates to the technical field of denitrification catalysts, in particular to a regeneration method for thallium poisoning denitrification catalysts. Background technique [0002] Nitrogen oxides (NOx) are one of the causes of pollution phenomena such as smog and acid rain, and have become the key targets of air pollution control. With the implementation of the "Action Plan for the Prevention and Control of Air Pollution" and the implementation of strategic plans such as the Blue Sky Defense War, the emission standards of industrial smoke are becoming more and more stringent. At present, after the NOx control in the coal power industry and the iron and steel industry has been basically completed, the cement industry has become the largest emitter of stationary sources of air pollutants (NOx) in my country. With the further improvement of national emission standards in the cement industry, SCR denitrification technology has become an esse...

AI Technical Summary

Problems solved by technology

The concentration of sulfuric acid used in the regeneration method disclosed in this patent application is relatively high, and there is a certain loss of catalyst active components, which also affects the safety of operation.

The patent application with the publication number CN111589473A discloses the regeneration and recycling of a thallium poisoned SCR denitrification catalyst. Although the concentration of sulfuric acid is reduced, only about 70% of the thallium on the surface of the catalyst can be removed.

Images