Composite catalyst flue gas denitrating under low-temperature condition and method of preparing the same

A composite catalyst, low temperature technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of poor thermal stability, low activity, etc., and achieve cost Low, low element cost, longevity effect

Inactive Publication Date: 2008-09-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main problem to be solved by the present invention is to improve the low activity and poor thermal stability of most of the catalys

Method used

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  • Composite catalyst flue gas denitrating under low-temperature condition and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 133.5g of ZrO(NO 3 ) 2 2H 2 O and 92.96g of TiCl 4 , first ZrO(NO 3 ) 2 2H 2 O was dissolved in 1 L of deionized water, and the TiCl 4 Drop into the zirconyl nitrate solution and continue stirring until completely dissolved. Under vigorous stirring, the mixed solution obtained above was slowly dripped into the ammonia solution to pH=8, and a large amount of white precipitate was rapidly generated, aged for 2 hours, the excess liquid in the upper layer was filtered off, and the white precipitate was washed until there was no chloride ion (with nitric acid Silver solution test), pumping rate to obtain precipitated matter, dried in an oven at 110°C and calcined at 500°C for 6h to obtain a catalyst carrier. Immerse the equal volume of the obtained carrier in the solution of manganese acetate and cerium nitrate, after immersion for 4 hours, dry it directly in an oven at 110°C, and then calcinate at 600°C for 2 hours to obtain a catalyst, in which manganese oxide...

Embodiment 2

[0030] Weigh 132.6g of ZrOCl 2 ·8H 2 O and 117.62 g of TiCl 4 , first ZrOCl 2 ·8H 2 O was dissolved in 1 L of deionized water, and the TiCl 4 Drop into the zirconium oxychloride solution and continue stirring until completely dissolved. Under vigorous stirring, the mixed solution obtained above is slowly dripped into the ammonium carbonate solution until the pH is 9, a large amount of white precipitates are rapidly generated, aged for 2h, the excess liquid in the upper layer is filtered, and the white precipitates are washed until there is no chloride ion (with Silver nitrate test), pumping rate to obtain precipitated matter, dried in an oven at 110°C, and calcined at 550°C for 2h to obtain a catalyst carrier. Immerse the equal volume of the obtained carrier in a solution of manganese nitrate and ammonium metavanadate, let it stand for 4 hours, dry it in an oven at 110°C, and calcinate it at 450°C for 2 hours to obtain a catalyst, in which manganese oxides account for tit...

Embodiment 3

[0034] Weigh 132.61g of ZrCl 4 and 74.05g of TiOSO 4 2H 2 O, first ZrCl 4 Dissolved in 1L of deionized water, then TiOSO 4 2H 2O was dropped into the zirconium chloride solution and continued to stir until it was completely dissolved. Under vigorous stirring, slowly drop the mixed solution obtained above into the ammonia solution to pH = 10, a large amount of white precipitate is rapidly formed, age for 2 hours, filter off the excess liquid in the upper layer, wash the white precipitate 6 times, and pump the precipitate to obtain the precipitate The material was dried in an oven at 110°C, and calcined at 600°C for 2 hours to obtain a catalyst carrier. Immerse the equal volume of the obtained carrier in the solution of manganese nitrate and ferric nitrate, dry it in an oven at 110°C after immersion for 4 hours, and calcinate it at 350°C for 2 hours to obtain the catalyst, in which the oxide of manganese accounts for 1% of the mass of the titanium-zirconium composite oxide....

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Abstract

The invention relates to a composite catalyst used for denitrification of flue gases under low-temperature conditions. The catalyst contains a Ti/Zr composite oxide as carrier, an oxide of manganese as catalytically-active component, and at least one oxide of vanadium, chromium, iron, copper, nickel and cerium as auxiliary agent. The Ti/Zr composite oxide is prepared by coprecipitation method and loads the catalytically-active component and the auxiliary agent by immersion method, wherein the mole ratio of Ti/Zr in the composite oxide is controlled in a range from 0.25 to 4, the oxide of manganese accounts for 1-15% of the weight of the Ti/Zr composite oxide, and the auxiliary agent accounts for 1-5% of the weight of the Ti/Zr composite oxide. The catalyst has good catalytic activity at low temperature and high NO conversion rate up to 100% at 100-300 DEG C, and has good prospect in industrial application.

Description

Technical field: [0001] The invention relates to a catalyst capable of selective catalytic reduction (SCR) of nitrogen oxides in flue gas to nitrogen and water under low temperature conditions and a preparation method thereof. Background technique: [0002] Coal is the most important energy in my country, accounting for about 70% of the primary energy consumption and composition. The combustion of coal produces nitrogen oxides (NO x ) massive emissions, including NO, NO 2 , N 2 O, N 2 o 3 and N 2 o 4 etc., mainly in NO and NO 2 Exists in the form of NO, and NO accounts for more than 90%. The emission of nitrogen oxides has brought direct harm to public health, leading to a series of neurasthenia syndrome and respiratory inflammation. The diffusion of nitrogen oxides into the atmosphere will form acid rain (pH<5.6). According to the relevant statistics of the State Environmental Protection Administration in 2006, the harm of acid rain in my country is relatively se...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/22B01J21/06B01D53/56
Inventor 祝社民张延东李慧远
Owner NANJING UNIV OF TECH
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