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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 problems such as unsatisfactory low-temperature activity, low operating space velocity, and unsuitability for efficient removal of nitrogen oxides, and achieve good industrial application prospects, strong resistance, The effect of high activity at low temperature

Active 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

[0005] Although the catalysts listed above have high ammonia-selective catalytic reduction of nitrogen oxides at medium and high temperatures, some catalysts have unsatisfactory low-temperature activity, or low operating space velocity, and are not suitable for nitrogen oxidation in diesel vehicle exhaust. Efficient removal of substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0021] Weigh 10.8 g of FeCl 3 ·6H 2 O, 0.178 g of Sm(NO 3 ) 3 ·6H 2 O, 0.116 g of Ni(NO 3 ) 3 ·6H 2 O was dissolved in deionized water to make a mixed solution, that is, Sm / Fe = 0.01 (molar ratio), Ni / Fe = 0.01 (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 solution is 11, then dropwise add the mixed metal salt solution and 0.2 M Na 2 CO 3 Solution, control the dropping speed of the two, so that the pH value of the solution is kept at 11; after the addition is completed, the mixture is stirred at room temperature for 24 h, then suction filtered and washed until the filtrate is neutral, and the obtained filtrate The cake was air-dried in an oven at 50 °C...

Embodiment 2

[0025] Weigh 7.997 g of Fe 2 (SO 4 ) 3 , 8.88 g of Sm(NO 3 ) 3 ·6H 2 O, 5.816 g of Ni(NO 3 ) 3 ·6H 2 O, dissolved in deionized water to make a mixed solution, that is, Sm / Fe = 0.5 (molar ratio), Ni / Fe = 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 solution is 8, then drop the mixed metal salt solution and 0.2 M Na into the beaker at the same time 2 CO 3solution, control the dropping speed of the two, and keep the pH value of the solution at 8; The cake was air-dried in an oven at 120 °C for 2 h, and finally it was placed in a muffle furnace and calcined in static air at 650 °C for 2 h 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. The test results showed that the removal rate of NO was higher than 80% at the reaction temperature of 240-410°C.

Embodiment 3

[0029] Weigh 10.8 g of FeCl 3 ·6H 2 O, 3.552 g of Sm(NO 3 ) 3 ·6H 2 O, 2.326 g of Ni(NO 3 ) 3 ·6H 2 O, dissolved in deionized water to make a mixed solution, that is, Sm / Fe = 0.2 (molar ratio), Ni / Fe = 0.3 (molar ratio).

[0030] Preset 100 mL of deionized water in the beaker, slowly add 0.1 M NaOH solution dropwise under stirring until the pH value of the solution is 11, then add the mixed metal salt solution and 0.1 M NaOH solution dropwise into the beaker at the same time, control The dropping speed of the two was adjusted to keep the pH value of the solution at 11; ℃ drying in an oven for 12 h, and finally placed in a muffle furnace and calcined in static air at 450 °C for 4 h to obtain catalyst 3#.

[0031] The method of Example 1 was used to test the activity of catalyst 3# on ammonia selective catalytic reduction of nitrogen oxides. The test results showed that the removal rate of NO was higher than 80% at the reaction temperature of 210-460°C.

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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. According to the catalyst, ferric oxide is used as an active ingredient, and rare-earth oxide and other transition metal oxides with different contents are used as co-catalysts. The catalyst is characterized in that the catalyst has a very wide temperature window for the reaction of ammonia selective reduction of nitrogen oxide, can be used for realizing over 80 percent NO removal rate in the temperature range of 100-550 DEG C, has strong water resistance and sulfur poisoning resistance, and can be regenerated to recover performance by means of simply rinsing after being poisoned by sulfur dioxide. The catalyst has a simple preparation method and low cost, 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 a preparation method and application of an ammonia selective catalytic reduction nitrogen oxide catalyst used for flue gas denitrification or nitrogen oxide elimination in motor vehicle tail gas, and belongs 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. Air Pollution. 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 method, which has high efficiency and great impact on boilers. The advantages of little modification of the original equipment, etc., the technology has achieved large-scale industrial...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/889B01J38/64B01D53/56B01D53/86B01D53/94
CPCY02T10/12
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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