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Catalyst for ammonia selective reduction of nitrogen oxide and preparation method of catalyst

A technology of nitrogen oxides and catalysts, applied in the field of environmental pollution control, can solve the problems of lower operating temperature, poor low-temperature activity, etc., and achieve the effects of lower operating temperature, high low-temperature activity, and simple preparation process

Inactive Publication Date: 2015-04-08
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the contradiction between the requirement of low-temperature activity of the catalyst and the poor low-temperature activity of the existing catalyst in the application process of the catalyst for denitrification of flue gas or elimination of nitrogen oxides in motor vehicle exhaust, and to provide a catalyst for A low-temperature high-activity ammonia selective catalytic reduction catalyst for flue gas denitrification or elimination of nitrogen oxides in motor vehicle exhaust and a preparation method thereof. The catalyst of the present invention can significantly reduce the operating temperature and achieve a higher temperature in the temperature range of 50-300°C. NO removal rate, and catalyst for low concentrations of SO in flue gas 2 Has a strong tolerance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of the described low-temperature ammonia selective catalytic reduction nitrogen oxide catalyst for denitrification of flue gas or removal of nitrogen oxides in motor vehicle exhaust gas, comprising the following steps:

[0021] Weigh 6.66 g of Sm(NO 3 ) 3 ·6H 2 O and 17.9 g of 50% by weight Mn(NO 3 ) 2 The solution was dissolved in deionized water to make a mixed solution, i.e. Sm / Mn=0.03 (molar ratio).

[0022] Preset 100 mL of deionized water in a beaker, and slowly add 0.2 M Na 2 CO 3 solution until the pH value of the aqueous solution is 11, then drop the mixed metal salt solution and 0.2 M Na into the beaker at the same time 2 CO 3 Solution, control the rate of addition of the two, so that the pH value of the solution remains at 11. After the dropwise addition, the resulting mixture was stirred at room temperature for 24 h, then suction filtered and washed until the filtrate was neutral, and the obtained filter cake was placed in an ove...

Embodiment 2

[0025] Weigh 6.66 g of Sm(NO 3 ) 3 ·6H 2 O and 7.35 g of Mn(Ac) 2 4H 2 O was dissolved in deionized water to make a mixed solution, that is, Sm / Mn = 0.5 (molar ratio).

[0026] Preset 100 mL of deionized water in a beaker, and slowly add 0.2 M Na 2 CO 3 solution until the pH value of the aqueous solution is 8, then drop the mixed metal salt solution and 0.2 M Na into the beaker at the same time 2 CO 3 Solution, control the rate of addition of the two, so that the pH value of the solution remains at 8. After the dropwise addition, the resulting mixture was stirred at room temperature for 24 h, then suction filtered and washed until the filtrate was neutral, and the obtained filter cake was placed in an oven at 120 °C for 12 h, and finally placed in a Calcined in static air at 350°C for 6 h in a muffle furnace to obtain catalyst 2#.

[0027]The method of Example 1 was used to test the activity of catalyst 2# on ammonia selective catalytic reduction of nitrogen oxides. T...

Embodiment 3

[0029] Weigh 6.66 g of Sm(NO 3 ) 3 ·6H 2 O, 3.906 g of Ce(NO 3 ) 3 ·6H 2 O and 22.65 g of anhydrous MnSO 4 Dissolved in deionized water to make a mixed solution, namely Sm / Mn=0.1 (molar ratio), Ce / Mn=0.06 (molar ratio).

[0030] Preset 100 mL of deionized water in a beaker, and slowly add 0.2 M Na 2 CO 3 solution until the pH value of the aqueous solution is 11, then drop the mixed metal salt solution and 0.2 M Na into the beaker at the same time 2 CO 3 Solution, control the rate of addition of the two, so that the pH value of the solution remains at 11. After the dropwise addition, the resulting mixture was continuously stirred at room temperature for 2 h, then suction filtered and washed until the filtrate was neutral, and the obtained filter cake was placed in an oven at 120 ° C for 12 h, and finally placed in Calcined in static air at 450°C for 2 h in a muffle furnace to obtain catalyst 3#.

[0031] The catalyst obtained after calcining is pressed into tablets a...

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Abstract

The invention relates to a compound oxide catalyst for ammonia selective reduction of nitrogen oxide and a preparation method of the compound oxide catalyst. The catalyst is mainly applied to purification of nitrogen oxide in flue gas of factories and tail gas of motor vehicles. The catalyst is mainly prepared from manganese oxide and rare-earth oxides with different contents, and is characterized by good low-temperature activity, strong water resistance and strong sulfur poisoning resistance for the reaction of ammonia selective reduction of nitrogen oxide, and over 80 percent of conversion rate of nitrogen oxide in a temperature range of 50-300 DEG C. The catalyst can be regenerated to completely recover the activity by means of simply rinsing after sulfur poisoning. The catalyst has a simple preparation method, low cost and good low-temperature activity, and has a good application prospect in purification of nitrogen oxide in flue gas of factories and tail gas of motor vehicles.

Description

technical field [0001] The invention relates to an ammonia selective catalytic reduction catalyst used for flue gas denitrification or nitrogen oxide elimination in motor vehicle tail gas and a preparation method thereof, belonging to the field of environmental pollution control. technical background [0002] At present, my country's energy structure is dominated by coal. According to statistics, thermal power installed capacity accounts for more than 74% of my country's installed power generation capacity. While converting coal resources into electric energy, a large amount of nitrogen oxides and sulfur dioxide are produced, causing serious environmental problems. pollute. Among various flue gas denitrification technologies such as selective catalytic reduction, selective non-catalytic reduction, and nitrogen oxide storage and reduction, the most widely used and most mature technology is the selective catalytic reduction denitrification method with ammonia, which has high de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/56B01D53/94B01D53/90
CPCY02A50/20Y02T10/12
Inventor 卢冠忠孟冬梅詹望成郭耘郭杨龙王丽王筠松王艳芹刘晓晖
Owner EAST CHINA UNIV OF SCI & TECH
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