Rare earth-based redox catalyst for flue gas denitrification of coking plant and preparation method thereof

Abstract

The invention discloses a rare earth-based redox catalyst for flue gas denitrification of a coking plant and a preparation method thereof. The preparation method sequentially comprises the following steps: S1, preparing a solid solution matrix material; and S2, preparing catalyst. The method has the advantages that the method can adapt to the removal performance of nitric oxide under the low-temperature working condition, meanwhile, the operation and maintenance cost is greatly reduced, the outsourcing cost of a reducing agent is particularly reduced, the economic value of cerium oxide in therare earth ore is increased, and the problem of environmental pollution caused by cerium oxide serving as solid waste is solved.

Description

technical field [0001] The application relates to the field of removal of flue gas pollutants in coking plants, in particular to a rare earth-based redox catalyst for denitrification of flue gas in coking plants and a preparation method thereof. Background technique [0002] The flue gas emission of the coking plant industry is characterized by low flue gas temperature, and its normal temperature catalyst cannot meet the normal demand. [0003] At the same time, the low-temperature catalysts currently selected in coking plants still use the SCR method, that is, the selective catalytic reduction method, which requires external injection of the reducing agent NH 3 , Such as ammonia water, liquid ammonia, urea, etc., have relatively strict requirements for the transportation and storage of ammonia sources, and also increase the operation and maintenance costs of reducing agents. [0004] Another: The rare earth cerium oxide in the raw material is disposed of as a by-product wh...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a rare earth-based redox catalyst for flue gas denitrification in a coking plant and its preparation method. By designing a low-temperature catalyst, that is, a catalyst with a temperature range of 140-180°C, it is synthesized, mixed, filtered, extruded The method of extraction, drying, and roasting is used to realize the preparation of low-temperature catalysts. When preparing low-temperature catalysts, the synthesis process between the components is adjusted, and the directional loading of components is realized through the step-by-step synthesis process; the CO in the coking plant is used As a reducing agent, carry out oxidation and reduction to remove nitrogen oxides, solve the problems of high operation and maintenance costs and improve the economic value of cerium oxide in rare earth ores

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