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Catalyst for cleaning and treating exhaust gas of internal combustion engine and preparation method thereof

A technology of catalyst and air, applied in the field of catalyst, can solve problems such as poor product effect and narrow range

Active Publication Date: 2018-04-10
广州市威格林环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also disclosed that sodium bicarbonate and sodium carbonate are included in the alkaline or alkaline earth metal weak acid salts used, but in this technology, sodium bicarbonate and sodium carbonate are used as alkali sources, and the product effect obtained by setting the zeolite molecular sieve material ratio is not good enough. narrow range of choices

Method used

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  • Catalyst for cleaning and treating exhaust gas of internal combustion engine and preparation method thereof
  • Catalyst for cleaning and treating exhaust gas of internal combustion engine and preparation method thereof
  • Catalyst for cleaning and treating exhaust gas of internal combustion engine and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] 0.8 g of sodium hydroxide, 10.5 g of potassium hydroxide (85%) and 27 g of deionized water were prepared into a solution, 1.06 g of sodium carbonate was added, and stirred to dissolve. Add 0.27 g of aluminum powder to dissolve. After the temperature of the solution dropped to room temperature, 12.0 g of diatomaceous earth was added and stirred for half an hour until the mixture was uniform. The molar composition of this mixture is Na 2 O:K 2 O: Na 2 CO 3 :Al 2 o 3 : SiO 2 :H 2 O=2:16:2:1:40:300. It was left to stand at room temperature for 2 hours, then transferred to a Teflon-lined stainless steel sealed kettle, heated to 120°C, and left to stand for 2 days. Then cool to room temperature, open the sealed kettle, pour off the supernatant, recover the white solid, and wash it three times with clear water. The resulting white powder was dried at 80°C.

[0042] Picture 1-1 It is the powder X-ray diffraction pattern of the product obtained in this embodiment, a...

Embodiment 2

[0044] Dissolve 3.6 grams of sodium hydroxide and 6.6 grams of 85% potassium hydroxide in 45.0 grams of deionized water, add 8.4 grams of sodium bicarbonate, and add 0.82 grams of sodium metaaluminate to dissolve. Then slowly add 18.0 grams of white carbon black while stirring, after stirring evenly, let stand at room temperature for 12 hours. The molar composition of this mixture is Na 2 O:K 2 O: NaHCO 3 :Al 2 o 3 : SiO 2 :H 2 O=10:10:20:1:60:500. The aged mixture was sealed in a Teflon-lined stainless steel autoclave, heated to 150 °C and allowed to stand for 3 days. Cool to room temperature, open the sealed kettle, pour off the supernatant, recover the white solid, and wash with water three times. The resulting white powder was dried at 80°C.

[0045] figure 1 -2 is the powder X-ray diffraction pattern of the product obtained in this embodiment, it can be known that the product is a zeolite molecular sieve with a chabazite structure. The chemical element analysis...

Embodiment 3

[0047] Dissolve 2.0 grams of sodium hydroxide and 13.2 grams of potassium hydroxide in 36.0 grams of deionized water, add 8.0 grams of sodium carbonate, and add 0.78 grams of aluminum hydroxide to dissolve. 60.0 g of 40% silica sol was slowly added with stirring. The molar composition of this mixture is Na 2 O:K 2 O: NaHCO 3 :Al 2 o 3 : SiO 2 :H 2 O=5:20:15:1:80:800. After the mixture was stirred evenly, it was directly transferred to a Teflon-lined stainless steel kettle without aging, heated to 150 degrees Celsius, and the reaction kettle was turned at a rate of 1 revolution per minute. Keep it for 5 days, then cool to room temperature, open the sealed kettle, pour off the supernatant, recover the white solid, and wash it three times with water. The obtained white powder is dried at 80 degrees centigrade to obtain the product.

[0048] figure 1 -3 is the powder X-ray diffraction pattern of the product obtained in this embodiment, it can be known that the product is...

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Abstract

The invention relates to aluminosilicate chabazite with medium silica-alumina ratio. The molar ratio of silicon atoms to aluminum atoms of the aluminosilicate chabazite is 20-40, the aluminosilicate chabazite is prepared from compounds of an aluminum source and a silicon source, sodium hydroxide, potassium hydroxide and a buffer agent according to the molar ratio as follows: Na2O: K2O: the buffer agent: Al2O3: SiO2: H2O= (2-20): (2-20): (2:20): 1: (40-80): (300-800), the buffer agent is one or two of sodium bicarbonate and sodium carbonate, and then the aluminosilicate chabazite is loaded with copper ions to obtain an internal combustion engine tail gas cleaning treatment catalyst. Chabazite is convenient to synthesize. The catalyst has catalytic activity on desorption of oxynitride from internal combustion engine tail gas by selective reduction; and after the catalyst is aged, the activity of the catalyst is still above 90%.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a catalyst for cleaning and treating the tail gas of an internal combustion engine and a preparation method thereof, and more specifically relates to a chabazite with a medium silicon-aluminum ratio loaded with copper as an active component for the selective reduction and desorption of the tail gas of an internal combustion engine. A catalyst for removing nitrogen oxides and a preparation method thereof. Background technique [0002] Copper-loaded chabazite with a medium-high silicon-to-aluminum ratio can be used as a catalyst for the selective reduction of nitrogen oxides from the exhaust gas of an internal combustion engine. For example, US Patent No. 6709644 (2004) discloses that SSZ-62 zeolite with a silicon-aluminum atomic molar ratio between 40-100 has a chabazite structure and has catalytic activity for the selective reduction and removal of nitrogen oxides from the ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02B01J29/76
CPCB01J29/763B01J2229/18C01B39/02C01P2002/72
Inventor 杨晓波赵向云肖剑鸣范群
Owner 广州市威格林环保科技有限公司
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