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Ultra-low V mercury-removing catalyst containing Ce and preparation method thereof

A catalyst and mercury removal technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as environmental damage, high toxicity, unfavorable flue gas denitrification and mercury removal, and reduce emissions and costs Inexpensive, excellent oxidation effect

Active Publication Date: 2014-04-09
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that although the commercial vanadium-titanium-tungsten catalyst has a good oxidation effect on elemental mercury, the increase of V content will decompose more SO in the flue gas. 2 Oxidation is not conducive to flue gas denitrification and mercury removal
At the same time V 2 o 5 Highly toxic and cause serious damage to the environment

Method used

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  • Ultra-low V mercury-removing catalyst containing Ce and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: A novel Ce-containing ultra-low V catalyst for denitrification and demercuration, the catalyst label is B.

[0039] The characteristic expression is: . The preparation process of the Ce-containing ultra-low V catalyst comprises the following steps:

[0040] 1) Weigh 0.041175g of ammonium metavanadate and 1.80195g of ammonium tungstate, add them to 5ml of ammonium oxalate, mix with 400ml of deionized water, and stir in a water bath at 60~70°C until fully dissolved and evenly distributed.

[0041] 2) Using a one-step impregnation method, 20 g of nano Powder and 0.3201g of CeO2 powder were impregnated in the solution prepared in step 1), and the obtained mixed slurry was ultrasonically impregnated for 2 hours, and then magnetically stirred for 12 hours.

[0042] 3) Dry the solution after magnetic stirring at a constant temperature of 110° C. for 10 hours.

[0043] 4) The samples obtained after drying were calcined at 260°C for 2h and 550°C for 4h in ...

Embodiment 2

[0047] Example 2: A new type of Ce-containing ultra-low V catalyst for denitrification and demercuration, the catalyst label is C.

[0048] Its characteristic expression is:

[0049] The preparation process of the Ce-containing ultra-low V catalyst comprises the following steps:

[0050]1) Weigh 0.042915g of ammonium metavanadate and 1.87815g of ammonium tungstate, add them to 5ml of ammonium oxalate, mix with 400ml of deionized water, and stir in a water bath at 60~70°C until fully dissolved and evenly distributed.

[0051] 2) 20 g of nano powder and 1.66845g of CeO 2 The powder was immersed in the above prepared solution, and the obtained mixed slurry was ultrasonically immersed for 2 hours, and then magnetically stirred for 12 hours.

[0052] 3) Dry the solution after magnetic stirring at a constant temperature of 110° C. for 10 hours.

[0053] 4) The samples obtained after drying were calcined at 260°C for 2h and at 550°C for 4h in an air atmosphere. After ...

Embodiment 3

[0057] Example 3: A new Ce-containing ultra-low V catalyst for denitrification and mercury removal, the catalyst designation is D.

[0058] Its characteristic expression is:

[0059] The preparation process of the Ce-containing ultra-low V catalyst comprises the following steps:

[0060] 1) Weigh 0.04545g of ammonium metavanadate and 1.9887g of ammonium tungstate, add them to 5ml of ammonium oxalate, mix with 400ml of deionized water, and stir in a water bath at 60~70°C until fully dissolved and uniform.

[0061] 2) Adopt one-step dipping method, take 20g powder and 3.52935g CeO 2 The powder was immersed in the above prepared solution, and the obtained mixed slurry was ultrasonically immersed for 2 hours, and then magnetically stirred for 12 hours.

[0062] 3) Dry the solution after magnetic stirring at a constant temperature of 110° C. for 10 hours.

[0063] 4) The samples obtained after drying were calcined at 260°C for 2h and at 550°C for 4h in an air atmospher...

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Abstract

The invention provides an environment-friendly ultra-low V mercury-removing catalyst containing Ce and a preparation method thereof. According to the catalyst, Fe2O3 is taken as a carrier; an active substance is loaded on the carrier; WO3 is taken as a cocatalyst; the characteristic expression formula is CeO2-V2O5-WO3 / Fe2O3. The catalyst comprises the following components by percentage: 1-10% of CeO2, 0-0.1% of V2O5, 84-95% of Fe2O3 and 5% of WO3. The catalyst has an excellent oxidation effect of mercury, the discharge of Hg is obviously reduced, and the damage to the environment caused by the inactivated catalyst is reduced. The preparation method has the characteristics of simple technology, low cost and small damage to the environment, the requirements of flue gas denitration can be met, promotion of industrialization process of a denitration catalyst in China is facilitated, and the catalyst has a good application prospect.

Description

Technical field [0001] The present invention involves catalysts used to oxidize HG for coal -fired power plants, and specifically involves an environment -friendly type of CE ultra -low V mercury removal catalyst.The field of fire and mercury removal technology. [0002] Background technique [0003] Comecades are the only liquid metal elements in nature, and the melting point is only -38.89 ° C.It has a long history of toxic substances and is among the most toxic marks.Although the pollution of mercury to the ecological environment is slow, after entering the atmosphere, water body, and soil, it will gather in the organism to cause serious harm to the human ecological environment.The Ministry of Environmental Protection of China has promulgated the latest "GB13223-2011), the latest" GB13223-2011), which requires the emissions of mercury and compound emissions in the coal flue gas of the power plant to 0.03mg / nm from 2015 3 Essence [0004] For the discharge control of burning fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/86B01D53/64
Inventor 杨剑孙健赵冬杨强刘清才孔明徐晶
Owner CHONGQING UNIV
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