Fluorine-grafted manganese-supported porous carbon-based catalytic material and its preparation method and its application in low-temperature water-resistant denitrification

Abstract

The invention discloses a fluorine-grafted manganese-loaded porous carbon-based catalytic material, a preparation method thereof and an application thereof in low-temperature water-resistant denitrification, belonging to the technical fields of environmental protection and porous carbon materials. The invention provides a low-cost, high water-resistance, high-activity low-temperature denitrification carbon fluoride catalyst, which contains C: 30%-75%, O: 1%-15%, F: 20%-55%, Mn: 0.01 %~5%. The invention introduces the Mn element with high-efficiency catalysis for fluorination reaction, so that the fluorine grafting process can be carried out at room temperature or low temperature, and a fluorine-grafted porous carbon-based catalytic material with a F content of 20% to 55% is prepared, which has high Hydrophobic, high wear resistance, high corrosion resistance, etc., can be applied to low-temperature selective catalytic reduction denitrification (SCR), and the denitrification rate can reach 100%, which solves the defect of low denitrification efficiency caused by poor water resistance of current SCR catalysts.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection and porous carbon materials, and in particular relates to a fluorine-grafted manganese-supported porous carbon-based catalytic material and its preparation method and application. Background technique [0002] In 2017, my country's energy consumption accounted for 23.2% of the world's total, and its energy consumption growth accounted for 33.6% of the world's total, ranking first in the world. In my country's energy consumption structure, coal accounts for as high as 60.4%. Coal consumption will produce a large amount of harmful gases, especially nitrogen oxides. In 2017, the total annual emission of nitrogen oxides in my country was still as high as 13.26 million tons, causing photochemical smog, Haze, ozone pollution and many other environmental problems have seriously affected the ecology and the environment. NOx is considered to be one of the primary pollutants in the atmosph...

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Problems solved by technology

The advantage of this process is that it reduces the wear and poisoning effect of dust on the catalyst, but the disadvantage is that the temperature of the flue gas is already lower than the activity requirement of the vanadium-titanium catalyst and the sulfur dioxide in the flue gas will still poison the catalyst.

(3) TE-SCR (tail end SCR): This process places the reactor at the end of the entire purification system. The advantage is that the poisonous effect of dust and sulfur dioxide on the catalyst is greatly reduced. The disadvantage is that the flue gas temperature is too low (80-150 °C ), unable to meet the reactivity temperature requirements of general commercial catalysts such as traditional vanadium-based catalysts (350-450°C)

CN102382366A discloses a preparation method of fluorinated carbon. The superhydrophobic modified carbon fluoride is obtained by reacting the carbon material at -25°C-100°C for 10min-48h. Although the reaction is carried out at low temperature, due to the chemical structure of the carbon material Stable, it is difficult to directly introduce fluorine on the carbon material at low temperature, resulting in low fluorine content of the fluorinated carbon; although CN106941178A can produce fluorinated carbon with a content of more than 40%, it must be processed at a high temperature of 400-700 °C and a high pressure of 100-100 °C. 500KPa reaction for 6 to 24 hours, high temperature oxidation, combustion, etc. under high temperature conditions will lead to performance degradation of porous carbon materials and potential safety hazards in operation, and the prepared carbon fluoride is mainly used in lithium batteries

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