Nitrogen oxide oxidizing catalyst and preparation method of nitrogen oxide oxidizing catalyst

A technology of nitrogen oxides and catalysts, which is applied in the field of catalysts for oxidation and removal of nitrogen oxides. It can solve the problems of poor activity, high cost, and high energy consumption in the field of preparation.

Inactive Publication Date: 2012-07-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing oxidation and denitration catalysts have problems such as poor activity at low temperature (for example, below 300

Method used

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  • Nitrogen oxide oxidizing catalyst and preparation method of nitrogen oxide oxidizing catalyst
  • Nitrogen oxide oxidizing catalyst and preparation method of nitrogen oxide oxidizing catalyst
  • Nitrogen oxide oxidizing catalyst and preparation method of nitrogen oxide oxidizing catalyst

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0051] Example 1

[0052] Weigh 2.22g of manganese acetate tetrahydrate to obtain an aqueous solution of manganese after dissolving, and weigh 5.00g of titanium dioxide (TiO 2 ) Add to it, continue stirring for 5 hours, rotary evaporate at 70°C, dry at 110°C overnight, and roast at 400°C for 5 hours. After cooling, it is ground, tableted, and sieved. A 40-60 mesh catalyst is selected as catalyst 1 for use. Change the mass of manganese acetate tetrahydrate to 0.22g, 4.46g, and the amount of titanium dioxide unchanged. Under the same circumstances, the impregnated samples with different manganese loadings were recorded as catalyst 2 and catalyst 3, respectively.

Example Embodiment

[0053] Example 2

[0054] Weigh 14.32g of 50% manganese nitrate (Mn(NO 3 ) 2 ) Solution plus deionized water to get Mn(NO 3 ) 2 Solution, weigh 11.65g cobalt nitrate (Co(NO 3 ) 2 ) Is dissolved in deionized water to obtain Co(NO 3 ) 2 The solution was mixed according to the molar ratio of cobalt to manganese of 1:1, and 0.5mol / L of sodium carbonate (Na 2 CO 3 ) And sodium hydroxide (NaOH) (molar ratio Na 2 CO 3 / NaOH=1:2), until pH=10, make Mn 2+ And Co 2+ The metal ions are completely precipitated, continue to stir the suspension for 5h, age for 12h, filter out the resulting precipitate, wash with deionized water, dry at 110°C overnight, roast at 300°C in air atmosphere for 5h, grind, press, sieving, and select The 40-60 mesh catalyst is for spare use, and it is recorded as catalyst 4. Using cerium (Ce) and copper (Cu) instead of cobalt (Co) as the second active component, catalyst 5 and catalyst 6 were prepared by the same method.

Example Embodiment

[0055] Example 3

[0056] Weigh 14.32g of 50% manganese nitrate (Mn(NO 3 ) 2 ) Solution plus deionized water to get Mn(NO 3 ) 2 Solution, weigh 23.30g cobalt nitrate (Co(NO 3 ) 2 ) Is dissolved in deionized water to obtain Co(NO 3 ) 2 The solution is mixed according to the molar ratio of cobalt to manganese of 2:1, and 0.5mol / L of sodium carbonate (Na 2 CO 3 ) And sodium hydroxide (NaOH) (molar ratio Na 2 CO 3 / NaOH=1:2), until pH=8, make Mn 2+ And Co 2+ The metal ions are completely precipitated, continue to stir the suspension for 10 hours, age for 24 hours, filter out the resulting precipitate, wash with deionized water, dry at 110°C overnight, roast at 500°C in an air atmosphere for 3 hours, grind, press, and sieving, select The 40-60 mesh catalyst is reserved for use, and it is recorded as catalyst 7. Change the dosage of cobalt nitrate, weigh 5.83g cobalt nitrate, and the dosage of manganese nitrate remains unchanged. Under the same circumstances, a catalyst with a molar ra...

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Abstract

The invention provides a catalyst for purifying nitrogen oxide. In the presence of oxygen, conversion from nitrogen oxide (such as NO, N2O and the like) to nitrogen dioxide can be realized at lower temperature. The catalyst is prepared by a coprecipitation method or a soaking method and the main active component of the catalyst is manganese oxide. The catalyst is suitable for catalytic oxidation of nitrogen monoxide in flue gas and then integrated control of desulfurization and denitrification is realized. The catalyst is applied to a purification test of simulated flue gas with NO concentration of 200ppm, the conversion from the NO to the NO2 can be realized at lower temperature, and the NO2 is fed into a desulfurizing tower for further reacting with a desulfurizing agent so as to realize removal of nitrogen oxides in flue gas. The catalyst has remarkable effect in flue gas denitrification of coal-fired industrial boilers, and has better practical value and economic benefit.

Description

technical field [0001] The invention relates to a method for removing nitrogen oxides, in particular, the invention relates to a catalyst for oxidatively removing nitrogen oxides, a preparation method thereof, and an application thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants causing air pollution, mainly from the combustion of fuel. NO x It can participate in the formation of acid rain and photochemical smog, which is extremely harmful to human health and the environment. With the development of the economy, people's awareness of environmental protection and health has gradually increased. x Emission requirements are becoming more and more stringent. Therefore, seeking reasonable and effective NO x The advanced control technology has very important practical significance and economic benefits. NO x The control methods mainly include pre-combustion control (fuel denitrification technology, etc.), combustion process control ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/889B01D53/86B01D53/56
Inventor 朱廷钰徐文青赵俊李鹏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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