Low temp. multiple component capalyst for flue gas denitration and its preparation process

A catalyst and multi-component technology, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as poor low-temperature activity, single variety of additives, and no poisoning performance

Inactive Publication Date: 2006-01-25
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of these catalysts is simple, some without TiO 2 Carrier (MnO X -CeO 2 Catalyst), some do not add catalyst additives (such as Mn / TiO 2 catalyst) or a single additive (such as Fe-Mn / TiO 2 Catalyst), so low temperature activity is poor, good SCR activity needs to be above 120°C or even 150°C, and can only resist low concentration of SO 2 and H 2 The poisoning effect of O, some even did not reflect the anti-SO 2 and H 2 Poisoning properties of O (such as Mn / TiO 2 catalyst)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh a certain mass of manganese and metal iron or copper or vanadium or cerium or chromium acetate or nitrate and carrier titanium dioxide and mix them uniformly in the aqueous solution, wherein the loading of manganese is 12%, and the molar ratio of manganese and variable-valence metal is 1.5 . Put it in an oven after standing for 2 hours, dry it at a temperature of 80-120°C, then calcinate it in air at 750°C, grind and sieve after cooling, and take a part of 60-100 mesh as a catalyst.

[0019] The method for testing the SCR activity of the prepared catalyst is as follows: put the prepared catalyst into a fixed-bed tubular reactor, and heat the reactor to the required reaction temperature with a tubular electric furnace. Simulated flue gas and reducing agent NH 3 into the reactor, where the simulated flue gas is N 2 , O 2 , NO / N 2 (in N 2 Diluted NO) mixed. Detect the concentration of NO at the inlet and outlet, and calculate the conversion rate of NO. In the ...

Embodiment 2

[0026] Weigh a certain mass of manganese and metal iron or copper or vanadium or cerium or chromium acetate or nitrate and carrier titanium dioxide and mix them uniformly in the aqueous solution, wherein the loading of manganese is 5%, and the molar ratio of manganese and variable valence metal is 0.5. Put it in an oven after standing for 4 hours, dry it at 80-120°C, then calcinate it in the air at 550°C, grind and sieve after cooling, and take the part of 60-100 mesh as catalyst.

[0027] The method of activity test is the same as embodiment 1, at reaction temperature 120 ℃, C NO =C NH3 =0.2%, C O2 = 2.3%, space velocity = 10000h -1 Under operating conditions, the catalytic reduction efficiency of the catalyst is maintained above 80%.

Embodiment 3

[0029] Weigh a certain mass of manganese and metal iron or copper or vanadium or cerium or chromium acetate or nitrate and carrier titanium dioxide and mix them uniformly in the aqueous solution, wherein the loading of manganese is 10%, and the molar ratio of manganese and variable-valence metal is 2.0. Put it in an oven after standing for 3 hours, dry it at 80-120°C, then calcinate it in the air at 450°C, grind and sieve after cooling, and take the part with 60-100 mesh as catalyst.

[0030]The method of activity test is the same as embodiment 1, at reaction temperature 120 ℃, C NO =C NH3 =0.2%, C O2 = 2.3%, space velocity = 10000h -1 Under operating conditions, the catalytic reduction efficiency of the catalyst is maintained above 90%.

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Abstract

A medium-and low-temp multi-element catalyst for denitrifying fume, that is, using NH4 for selective catalytic reduction (SCR) to Nox is composed of the oxide of Mn as active component, TiO2 as carrier, and the co-catalyst chosen from the oxides of valence-varied Fe, Cu, V, Ce and Cr. Its advantages are high catalytic activity and high resistance to SO2 and H2O poisoning.

Description

technical field [0001] The invention relates to a method for NH in flue gas denitrification 3 Selective Catalytic Reduction (SCR) NO X Low-temperature multi-component catalyst and its preparation method. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere. Foreign experience shows that NH 3 Selective Catalytic Reduction (SCR) as a reducing agent is currently the most effective method for flue gas denitrification. It mainly uses V 2 o 5 / TiO 2 and V 2 o 5 -WO 3 / TiO 2 The catalyst needs to be used above 350°C to avoid SO 2 poisoning of the catalyst. For this reason, the denitrification device must be placed before the air preheater of the boiler system and the electric dust collector to meet the requirements of the operating temperature. In this way, the high concentration of soot in the flue gas will affect the efficiency, stability and life of the catalyst for denitrification. If the low-temperature catalyst is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/889B01D53/56B01D53/86
Inventor 童志权刘炜伍斌
Owner XIANGTAN UNIV
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