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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°C), high energy consumption, high cost, and complicated operation. It is urgent to develop new oxidation and denitration catalysts

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
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Effect test

Embodiment 1

[0052] Take by weighing 2.22g manganese acetate tetrahydrate and dissolve to obtain the aqueous solution of manganese, take by weighing 5.00g titanium dioxide (TiO 2 ) into it, continuously stirred for 5 hours, 70°C rotary evaporation, 110°C overnight drying, 400°C roasting for 5h, after cooling, grinding, tableting, sieving, select 40-60 mesh catalyst for standby, denote as Catalyst 1. The mass of manganese acetate tetrahydrate was changed to 0.22g and 4.46g, and the amount of titanium dioxide was not changed. Under the same circumstances, the impregnated samples with different manganese loadings were recorded as catalyst 2 and catalyst 3, respectively.

Embodiment 2

[0054] Take by weighing 14.32g mass fraction and be 50% manganese nitrate (Mn(NO 3 ) 2 ) solution plus deionized water to obtain Mn(NO 3 ) 2 solution, weighed 11.65g cobalt nitrate (Co(NO 3 ) 2 ) was dissolved in deionized water to obtain Co(NO 3 ) 2 Solution, according to the cobalt-manganese molar ratio is 1: 1 ratio mixing, adds the sodium carbonate of 0.5mol / L (Na 2 CO 3 ) and sodium hydroxide (NaOH) mixture (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 5 hours, age for 12 hours, filter out the resulting precipitate, wash with deionized water, dry at 110°C overnight, roast at 300°C in air atmosphere for 5 hours, grind, tablet, sieve, select The 40-60 mesh catalyst is reserved 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 in the same way.

Embodiment 3

[0056] Take by weighing 14.32g mass fraction and be 50% manganese nitrate (Mn(NO 3 ) 2 ) solution plus deionized water to obtain Mn(NO 3 ) 2 solution, weighed 23.30g cobalt nitrate (Co(NO 3 ) 2 ) was dissolved in deionized water to obtain Co(NO 3 ) 2 Solution, mix according to the ratio of cobalt-manganese molar ratio of 2: 1, add 0.5mol / L sodium carbonate (Na 2 CO 3 ) and sodium hydroxide (NaOH) mixture (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 the resulting precipitate, wash with deionized water, dry at 110°C overnight, roast at 500°C for 3 hours in an air atmosphere, grind, press, sieve, and select The 40-60 mesh catalyst is reserved, and is recorded as catalyst 7. Change the consumption of cobalt nitrate, weigh 5.83g cobalt nitrate, the consumption of manganese nitrate is unchanged. Under the same circumstances, a catalys...

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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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