Supported cobalt manganese oxide catalyst for low-temperature flue gas denitration and preparation method thereof

Abstract

The invention discloses a supported cobalt manganese oxide catalyst for low-temperature flue gas denitration and a preparation method thereof, and belongs to the technical field of flue gas denitration catalysts. The method disclosed by the invention comprises the following steps: firstly, preparing a mixed aqueous solution of cobalt salt and manganese salt by taking the cobalt salt and the manganese salt as raw materials and taking anhydrous sodium carbonate or ammonia water as a precipitating agent; then, preparing a sodium carbonate solution and an ammonia water solution as precipitating agents, and performing deposition-precipitation, aging, suction filtration, washing, drying and baking to prepare a cobalt manganese oxide catalyst product by taking nano-sized hydrophilic TiO2, Al2O3, an HY molecular sieve or SiO2 with a high specific surface area as a carrier. The method disclosed by the invention has the advantages of conventional raw materials, simple preparation, safe production, low cost and the like; and moreover, active ingredients of the prepared supported cobalt manganese oxide catalyst are dispersed uniformly, so that relatively high activity of the catalyst can be kept, meanwhile, the stability of the catalyst is improved, and the cost is reduced. The catalyst prepared by the method disclosed by the invention can be widely used for removing NOx from flue gas at a low temperature, and is particularly suitable for removing NOx from the flue gas of a coal-fired power plant at the low temperature.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification catalysts, and in particular relates to a flue gas low-temperature denitrification loaded catalyst and a preparation method thereof. technical background: [0002] Nitrogen oxides (NO x , Nitrate) is an important air pollutant, which can lead to the formation of acid rain and photochemical smog, and is also directly harmful to the human body. NO x The main source of chemical fuels is the combustion of chemical fuels, including coal-fired power plants, industrial boilers, motor vehicle exhaust, etc., of which coal-fired power plants NO x Emissions accounted for my country's NO x more than half of the emissions. Therefore, controlling NO x The emissions of coal-fired power plants have become the third key treatment work after flue gas dust removal and desulfurization. At present, the most mature denitrification method in industry is based on NH 3 SCR (Selective Catalytic Redu...

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Problems solved by technology

Currently commercially available WO 3 -V 2 o 5 / TiO 2 The denitrification catalyst is very effective at a relatively high operating temperature (300-400°C). In order to maintain the temperature of the flue gas, the commonly used denitration process is a high-temperature denitrification process in which the SCR reactor is placed before the dust collector and desulfurizer, and this The process has the disadvantage that the catalyst is easily deactivated due to sulfur poisoning and dust wear

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