Forming process for low-temperature NOx rapid alternate adsorption-regeneration catalyst

Abstract

The invention relates to a catalyst forming technology for removing nitric oxide in flue gas, and particularly discloses a forming process for a low-temperature NOx rapid alternate adsorption-regeneration catalyst. The forming process comprises the following steps: dissolving soluble copper salt or / and cobalt salt, soluble cerium salt, other metal salt, citric acid or / and propylene glycol and a pore-forming agent in water, fully stirring, drying, carrying out extrusion forming, crushing to obtain raw catalyst particles, and roasting to prepare a composite metal oxide catalyst; extruding the fiber paper into a wave shape, coating the fiber paper with alumina sol or silica gel, and drying; dispersing the catalyst into the aluminum sol, and brushing the catalyst onto the surface of the fiberpaper; and stacking the fiber paper at intervals to form multiple layers of corrugations, and drying to obtain the product. According to the forming process, the good permeability of the porous catalyst is utilized to prevent flue gas from blocking catalyst pore channels when the flue gas flows through the catalyst, the catalyst can be effectively promoted to adsorb NOx in the flue gas, and the NOx adsorption efficiency of the catalyst is improved.

Description

technical field [0001] The invention relates to a catalyst molding technology for removing nitrogen oxides in flue gas, in particular to a molding technology for low-temperature NOx rapid alternate adsorption-regeneration catalyst. Background technique [0002] With the development of my country's economy and the improvement of people's quality of life, the pressure brought by environmental pollution is increasing. As one of the main pollutants of current air pollution, nitrogen oxides are closely related to the quality of my country's atmospheric environment. Coal-fired power plants are the main pollution source of concentrated emissions of nitrogen oxides. The reduction of nitrogen oxides in the flue gas emitted by them has become an important goal of governance today. Flue gas denitrification has also become an essential environmental protection facility for coal-fired power plants. This facility usually uses NH 3 -SCR (ammonia selective catalytic reduction) denitrificat...

AI Technical Summary

Problems solved by technology

[0003] As a technology with great development potential, NOx adsorption method has been widely used in the treatment of tail gas produced by nitric acid. However, the proportion of NO in flue gas in coal-fired power stations and metallurgical industries is very high, often above 90%, while NO 2 The proportion is very low. Due to the weak adsorption capacity of common adsorbents / catalysts for NO, they are far from meeting the requirements of flue gas NOx emission standards. The regeneration of adsorbents after adsorbing NOx is difficult, and the adsorption and regeneration of adsorbents / catalysts requires Two sets of equipment, resulting in the denitrification process can not be carried out continuously

[0004] Traditional granular bed catalysts have high NOx adsorption efficiency, but they are severely worn during use, resulting in short catalyst life, while honeycomb catalysts, plate catalysts, etc. have long life and mature preparation processes, but the NOx adsorption efficiency very low

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