A kind of non-vanadium-based low-temperature denitrification catalyst and preparation method thereof

Abstract

The invention relates to the field of catalyst material preparation and environmental protection, and discloses a non-vanadium-based low-temperature denitrification catalyst, which uses fly ash as a carrier to support catalytic active components and additives; the catalytic active components are manganese, iron, copper One or any combination of oxides; the auxiliary agent is a rare earth element oxide. The catalyst has extremely high low-temperature denitrification and anti-sulfur performance, can replace vanadium-based catalysts, and solves the problem that vanadium-based catalysts are harmful to the human body and the environment, and the problem of low-temperature sulfur poisoning of catalysts. Moreover, the present invention uses cheap fly ash as a carrier, realizes efficient utilization of bulk solid waste resources in power plants, effectively replaces titanium dioxide as the sole carrier of the catalyst, and reduces the preparation cost of the catalyst. At the same time, the active component of this series of catalysts is prepared by impregnation and calcination, using nitric acid-based metal salt solution as a precursor, and is an environmentally friendly catalyst in the true sense.

Description

technical field [0001] The invention belongs to the field of catalyst material preparation and environmental protection, and in particular relates to a non-vanadium-based denitration catalyst and a preparation method. Background technique [0002] Nitrogen oxides are one of the main pollutants emitted by fossil fuels, which not only endanger human health, but also cause a series of environmental problems such as acid rain and photochemical smog. question. At present, there are many nitrogen oxide treatment technologies, including wet method and dry method. The ability of wet method to remove nitrogen oxides is extremely limited, and it brings a series of difficult by-products; dry method is widely used and widely used. It is a selective catalytic reduction method, which is considered to be one of the effective methods for the removal of nitrogen oxides from stationary and mobile sources, but the development of catalysts is the key core issue. [0003] At present, the most ...

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Problems solved by technology

However, there are many problems in the actual use of this type of catalyst: 2 o 5 As an active ingredient, it is toxic to the environment and human body

[0005] The patent document of CN102935362A discloses a manganese-based denitrification catalyst with fly ash and attapulgite as the carrier. Although this catalyst has good denitrification performance when the reaction temperature is above 100°C, no research has been carried out on the effect of sulfur dioxide on the performance of the catalyst. research, and this method involves acid-modified fly ash carrier, the process is complicated, and there is acid pollution

The patent document of CN1607027A discloses a denitrification catalyst prepared from boiler fly ash, but the carrier fly ash of the catalyst still needs to be pickled and high-temperature alkali fusion, and the preparation process is complicated; at the same time, although this catalyst has Very good denitrification performance, but only shows that it has anti-sulfur performance, there is no data support, and the performance decreases when the flue gas temperature is low; while the exhaust gas temperature in China is generally 150-250 ° C, so this catalyst treats domestic The effect of exhausting smoke is not ideal

However, nitrogen oxides will also appear during the calcination process. It can be seen from this that how to carry out the use of fly ash as the carrier of the catalyst to load the nitric acid metal salt solution to prepare a low-temperature and high-efficiency sulfur-resistant catalyst while solving the production process. The emission of nitrogen oxides in China has become a double-edged sword

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