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Carbon-based heteropolyacid catalyst for simultaneous desulfurization and denitrification of low-temperature smoke gas and preparation and application methods thereof

A technology for desulfurization, denitrification and low temperature flue gas, applied in the field of denitrification and catalytic flue gas desulfurization, can solve the problems of poor thermal stability, small specific surface area, limited development and other problems, and achieve the effects of easy access, wide sources and reduced toxic effects

Inactive Publication Date: 2016-11-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has problems such as poor thermal stability, small specific surface area, and easy dissolution in the liquid phase, which limits its development in the field of catalysis.

Method used

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  • Carbon-based heteropolyacid catalyst for simultaneous desulfurization and denitrification of low-temperature smoke gas and preparation and application methods thereof
  • Carbon-based heteropolyacid catalyst for simultaneous desulfurization and denitrification of low-temperature smoke gas and preparation and application methods thereof
  • Carbon-based heteropolyacid catalyst for simultaneous desulfurization and denitrification of low-temperature smoke gas and preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 8g of commercial activated carbon, immerse it in distilled water and boil for 2h, then place it in a constant temperature drying oven at 105°C for 12h; then immerse it in a nitric acid solution with a mass fraction of 30%, and keep it in a constant temperature water bath at 60°C for 2h ; Filter out the acid solution, filter and wash with deionized water until the pH is between 6-7; finally place it in a constant temperature drying oven at 105°C for 12 hours.

[0037] Weigh 2g of phosphomolybdic acid and dissolve it in 16mL of water. Add the above-mentioned activated carbon into the aqueous solution of phosphomolybdic acid, stir manually until the mixture is even, seal it and let it stand for 18 hours, keep stirring in the water bath in a constant temperature water bath at 60°C until it evaporates to dryness, and then dry it in a constant temperature drying oven at 100°C for 12 hours to obtain the catalyst Precursor. The above precursors were activated by firing i...

Embodiment 2

[0040] Weigh 8g of commercial activated carbon, immerse it in distilled water and boil for 1.5h, then place it in a constant temperature drying oven at 100°C for 12h; then immerse it in a nitric acid solution with a mass fraction of 28%, and keep it 1h; filter out the acid solution, filter and wash with deionized water until the pH is between 6-7; finally place it in a constant temperature drying oven at 100°C for 12h.

[0041] Weigh 2g of silicotungstic acid and dissolve it in 16mL of water. Add the treated activated carbon into the aqueous solution of silicotungstic acid, stir manually until the mixture is uniform, seal and let stand for 21 hours. The impregnated activated carbon was placed in a constant temperature water bath at 63°C and stirred continuously until evaporated to dryness, and then dried in a constant temperature drying oven at 102°C for 11 hours to obtain a catalyst precursor.

[0042] The above precursors were activated by firing in a muffle furnace, with N...

Embodiment 3

[0045] Weigh 8.5g of commercial activated carbon, immerse it in distilled water and boil for 1h, then place it in a constant temperature drying oven at 103°C and dry it for 11h; then immerse it in a nitric acid solution with a mass fraction of 32%, and keep it 1.5h; filter out the acid solution, filter and wash with deionized water until the pH is between 6-7; finally place it in a constant temperature drying oven at 103°C for 11h.

[0046] Weigh 1.5g of phosphotungstic acid and dissolve it in 17mL of water. Add the treated activated carbon into the aqueous solution of phosphotungstic acid, stir manually until the mixture is uniform, seal and let it stand for 24 hours. The impregnated activated carbon was evaporated to dryness in a constant temperature water bath at 65°C, and then dried in a constant temperature drying oven at 105°C for 10 hours to obtain a catalyst precursor.

[0047] The above precursors were activated by firing in a muffle furnace, with N 2 For protective...

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Abstract

The invention discloses a carbon-based heteropolyacid catalyst for simultaneous desulfurization and denitrification of low-temperature smoke gas and a preparation and application methods thereof. The carbon-based heteropolyacid catalyst is characterized in that activated carbon is used as a carrier, and Kigggin type heteropolyacid is used as an active component; the catalyst is prepared from 80 to 85 parts of activated carbon and 15 to 20 parts of Kigggin type heteropolyacid in weight. The catalyst has the advantages that the reliance on temperature is low, and the higher desulfurization and denitrification activity is stilled maintained at low temperature (80 to 160 DEG C); the catalyst can be arranged at the tail part, behind a dedusting system, of a smoke gas treatment system with lower temperature, so that the dust amount is greatly reduced, the content of alkaline metal and alkaline-earth metal attached to dust is also reduced, the blockage function of dust on the catalyst and the toxic and harmful function of alkaline metal on the catalyst are greatly reduced, the consumption of the catalyst in the running process is decreased, and the service life of the catalyst is prolonged; the subsequent maintenance frequency and cost are reduced for a user.

Description

technical field [0001] The invention relates to the field of catalytic flue gas desulfurization and denitrification, in particular to a catalyst capable of simultaneously desulfurizing and denitrifying low-temperature flue gas and a preparation method thereof. Background technique [0002] my country's air pollution is very serious, among which sulfur dioxide and nitrogen oxides are the main air pollutants in our country, and they are also the focus and difficulty of air pollution control and environmental protection. According to the China Environmental Status Bulletin, in 2014 my country's atmospheric SO 2 The total emissions of nitrogen oxides and nitrogen oxides are 19.744 million tons and 20.788 million tons respectively. Since the "Tenth Five-Year Plan", with the construction of desulfurization facilities in my country's power plants, the effect of sulfur dioxide control has begun to appear, and nitrogen oxides have begun to replace sulfur dioxide as the largest acid ...

Claims

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Application Information

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IPC IPC(8): B01J31/18B01J27/188B01J27/19B01J23/30B01D53/86B01D53/60
CPCB01J27/188B01D53/8637B01D2258/0283B01J23/30B01J27/19
Inventor 李建军刘勇军龙军郭家秀刘勤楚英豪岑望来尹华强罗德明刘琪琪熊天龙
Owner SICHUAN UNIV
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