Ternary composite denitration and demercuration catalyst and preparation method thereof

Abstract

The invention relates to a ternary composite denitration and demercuration catalyst and a preparation method thereof. The ternary composite catalyst comprises 44-68wt% of a main catalyst, 16-24wt% of a first auxiliary agent and 8-40wt% of a second auxiliary agent, wherein the main catalyst is manganese dioxide, the first auxiliary agent is samarium sesquioxide, and the second auxiliary agent is tricobalt tetroxide or molybdenum trioxide. The preparation method comprises the following steps: S1, preparing a corresponding nitrate solution according to the mass percent conversion of each component in the catalyst; S2, preparing a citric acid solution; S3, dripping the citric acid solution into the nitrate solution, and performing rotary evaporation under reduced pressure to obtain gel; S4, drying, calcinating and grinding to obtain the ternary composite denitration and demercuration catalyst. The invention has the beneficial effects as follows: the ternary composite denitration and demercuration catalyst is simple in preparation process, low in cost and high in catalytic activity; in a flue gas atmosphere of a typical coal-fired power plant and at 100-200 DEG C, the denitration efficiency and the mercury oxidation rate can be 90% or higher and 80% or higherat the same time.

Description

technical field [0001] The invention belongs to the field of prevention and control of air pollutants, and relates to the removal of nitrogen oxides and mercury from industrial furnaces such as thermal power plants, industrial boilers, metallurgy, and waste incineration, and in particular to a ternary composite denitrification and mercury removal catalyst and its Preparation. Background technique [0002] my country is the world's largest coal producer and consumer, and one of the few countries in the world whose energy structure is dominated by coal. The annual coal consumption accounts for more than 50% of the world's total coal consumption. It is expected that my country's coal-based energy structure will not change fundamentally for a long period of time in the future. Coal combustion produces NO while providing heat x and air pollutants such as Hg. NO x A large amount of emissions of Hg and Hg will cause great harm to the environment and human health. All countries...

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Problems solved by technology

Vanadium-titanium-based medium-temperature catalysts have some problems in commercial engineering applications: (1) Because they are arranged before dust removal devices and desulfurization devices, the flue gas contains a large amount of fly ash, which causes catalyst wear and reduces catalyst performance and life; (2) ) Alkali metals (Na, K, etc.) and arsenic, mercury and other substances in the fly ash can easily cause catalyst poisoning and reduce the chemical performance and life of the catalyst; (3) SO in the flue gas 2 Easily oxidized to SO under the action of catalyst 3 , and generate corrosive substances under the action of water vapor in the flue gas, causing corrosion to downstream equipment such as the air preheater; (4) SO in the flue gas 2 Easily oxidized to SO under the action of catalyst 3 , then with NH 3 Combined, a compound with a higher viscosity is formed, and is attached to the air preheater and other downstream equipment together with the fly ash to cause blockage; (5) The vanadium component in the vanadium-titanium-based catalyst is easy to lose, causing certain damage to humans and the environment

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