Cheap low-temperature SCR catalyst with sulfur resistance and preparation method thereof

A technology of SCR catalyst and sulfur resistance, which is applied in the field of low-temperature SCR catalyst and preparation, can solve the problem of high cost of nitrate, achieve the effect of increasing catalytic activity, simple method, and improving dispersion

Inactive Publication Date: 2015-09-02
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nitrate and P used in t

Method used

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  • Cheap low-temperature SCR catalyst with sulfur resistance and preparation method thereof
  • Cheap low-temperature SCR catalyst with sulfur resistance and preparation method thereof
  • Cheap low-temperature SCR catalyst with sulfur resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] Catalyst preparation: Weigh a certain amount of Al(NO 3 ) 3 Powder, add proper amount of deionized water to make 2.5mol / L Al(NO 3 ) 3 Solution, under vigorous stirring, slowly add 25% NH dropwise 3 ·H 2 O solution, to pH=8-9, stop the dripping, continue stirring for 3h, stand for aging for 1h, centrifuge, and dry at 80℃ for 12h to obtain Al(OH) 3 solid. According to the molar ratio Ce:Mn:Al=0.02:0.4:1, measure a certain amount of Mn(NO 3 ) 2 Solution and Ce(NO 3 ) 2 Solid, add a small amount of deionized water to make Ce(NO 3 ) 2 The solid is dissolved, and the obtained Al(OH) 3 The solid is impregnated in Mn(NO 3 ) 2 And Ce(NO 3 ) 2 In the mixed solution for 12h, the impregnated product was dried in a water bath at 80°C for 12h, and then placed in an oven at 110°C for further drying for 2h to obtain a black solid. Then the black solid was calcined in a muffle furnace at 500°C for 6 hours, ground, and passed through a 40-60 mesh sieve to obtain a catalys...

Example Embodiment

[0030] Example 2:

[0031] Catalyst preparation: Weigh a certain amount of Al(NO 3 ) 3 Powder, add proper amount of deionized water to make 2.5mol / L Al(NO 3 ) 3 Solution, under vigorous stirring, slowly add 25% NH dropwise 3 ·H 2 O solution, to pH=8-9, stop the dripping, continue stirring for 3h, stand for aging for 1h, centrifuge, and dry at 80℃ for 12h to obtain Al(OH) 3 solid. According to the molar ratio Ce:Mn:Al=0.12:0.4:1, measure a certain amount of Mn(NO 3 ) 2 Solution and Ce(NO 3 ) 2 Solid, add a small amount of deionized water to make Ce(NO 3 ) 2 The solid is dissolved, and the obtained Al(OH) 3 The solid is impregnated in Mn(NO 3 ) 2 And Ce(NO 3 ) 2 In the mixed solution for 12h, the impregnated product was dried in a water bath at 80°C for 12h, and then placed in an oven at 110°C for further drying for 2h to obtain a black solid. Then the black solid was calcined in a muffle furnace at 500°C for 6 hours, ground, and passed through a 40-60 mesh sieve to obtain a catalys...

Example Embodiment

[0034] Example 3:

[0035] Catalyst preparation: Weigh a certain amount of Al(NO 3 ) 3 Powder, add proper amount of deionized water to make 2.5mol / L Al(NO 3 ) 3 Solution, under vigorous stirring, slowly add 25% NH dropwise 3 ·H 2 O solution, to pH=8-9, stop the dripping, continue stirring for 3h, stand for aging for 1h, centrifuge, and dry at 80℃ for 12h to obtain Al(OH) 3 solid. According to the molar ratio Ce:Mn:Al=0.20:0.4:1, measure a certain amount of Mn(NO 3 ) 2 Solution and Ce(NO 3 ) 2 Solid, add a small amount of deionized water to make Ce(NO 3 ) 2 The solid is dissolved, and the obtained Al(OH) 3 The solid is impregnated in Mn(NO 3 ) 2 And Ce(NO 3 ) 2 In the mixed solution for 12h, the impregnated product was dried in a water bath at 80°C for 12h, and then placed in an oven at 110°C for further drying for 2h to obtain a black solid. Then the black solid was calcined in a muffle furnace at 500°C for 6 hours, ground, and passed through a 40-60 mesh sieve to obtain a catalys...

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Abstract

The invention provides a cheap low-temperature SCR catalyst with sulfur resistance and a preparation method thereof, and belongs to the field of atmosphere pollution prevention NH3-SCR denitration. The catalyst adopts gamma-Al2O3 as a carrier, manganese oxide as an active ingredient and cerium oxide as a modification agent, and the molar ratio of Ce to Mn to Al is (0.02-0.20): 0.4: 1. When in preparation, NH3.H2O is adopted as a precipitating agent to precipitate the carrier precursor Al(NO3)3 to Al(OH)3, dried Al(OH)3 is soaked in a nitric acid solution of the active ingredient, and then Al(OH)3 is dried and calcined to obtain the SCR catalyst. The catalyst is excellent in low-temperature catalytic activity and capacity for resisting toxicity of SO2 and H2O, and the activity is 100 percent under the reaction condition of 120 to 240 DEG C; after 100ppm of SO2 and 3 percent of H2O are added, the activity can be maintained stable for a long time; after SO2 and H2O are cut off, the activity can be completely restored.

Description

technical field [0001] The invention relates to air pollution prevention and control NH 3 -SCR (Selective Catalytic Reduction) denitrification field, specifically related to a cheap and sulfur-resistant low-temperature SCR catalyst and its preparation method, suitable for low-concentration SO in the tail gas emitted by coal-fired power plants 2 NO x remove. technical background [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere, with NO and NO 2 The largest proportion. NO x It will cause great harm to human body and environment. my country's energy structure is more coal and less oil. The "12th Five-Year Plan for the Development of the Coal Industry" issued by the China Energy Administration points out that coal is the main energy source in my country, accounting for about 70% of the primary energy structure. For a long time to come, the status of coal as the main energy source will not change. Anthropogenic NO x The vast majority is du...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/90B01D53/56
Inventor 张晓鹏张呈祥贺高红周学荣
Owner DALIAN UNIV OF TECH
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