Catalyst for low-temperature denitration of power-plant flue gas by selective catalytic reduction (SCR) and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of single component, no anti-SO2 poisoning ability, Oxide catalytic activity reduction and other problems, to achieve a good anti-SO2 poisoning effect

Inactive Publication Date: 2010-03-24
河北晶锐瓷业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the single component of these catalysts, they did not show good anti-SO2 poisoning ability
[0004] It was found that when the oxides of Ti and Ce are uniformly mixed, because there are some similarities between the properties of these tw

Method used

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  • Catalyst for low-temperature denitration of power-plant flue gas by selective catalytic reduction (SCR) and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0017] Example 1:

[0018] Weigh a certain mass of cerium and metal iron or vanadium or chromium nitrate or acetate and tungsten-doped titanium dioxide and mix them uniformly in an aqueous solution, wherein the loading amount of cerium is 10%, and the molar ratio of cerium to variable-valent metal is 1.2. Stir mechanically for 2 hours to make it evenly mixed, put it in a drying oven after standing for 3 hours, and dry it at a temperature of 70-110°C for 4-8 hours, and then calcinate it in the air at 350-650°C, the calcining time After cooling for 3-6 hours, grind and sieve, and take the part of 40-60 mesh as the catalyst.

[0019] The test method for the SCR denitrification efficiency of the prepared catalyst is: 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 composition of the simulated flue gas is N ...

Example Embodiment

[0028] Example 2:

[0029] Weigh a certain mass of cerium and metal iron or vanadium or chromium nitrate or acetate and tungsten-doped titanium dioxide and mix them uniformly in the aqueous solution, wherein the loading amount of cerium is 4%, and the molar ratio of cerium to variable-valence metal is 1.5. Stir mechanically for 2 hours to make it evenly mixed, put it in a drying oven after standing for 3 hours, and dry it at a temperature of 70-110°C for 4-8 hours, and then calcinate it in the air at 350-650°C, the calcining time After cooling for 3-6 hours, grind and sieve, and take the part of 40-60 mesh as the catalyst.

[0030] The test method of catalyst activity is the same as embodiment 1, at reaction temperature 180 ℃, C NO =C NH3 =0.2%, C O2 = 5%, air speed = 40000h -1 Under certain test conditions, the catalytic reduction efficiency of the catalyst remains above 80%.

Example Embodiment

[0031] Example 3:

[0032] Weigh a certain mass of cerium and metal iron or vanadium or chromium nitrate or acetate and tungsten-doped titanium dioxide and mix them uniformly in an aqueous solution, wherein the loading amount of cerium is 8%, and the molar ratio of cerium to variable-valence metal is 1.8. Stir mechanically for 2 hours to make it evenly mixed, put it in a drying oven after standing for 3 hours, and dry it at a temperature of 70-110°C for 4-8 hours, and then calcinate it in the air at 350-650°C, the calcining time After cooling for 3-6 hours, grind and sieve, and take the part of 40-60 mesh as the catalyst.

[0033] The test method of catalyst activity is the same as embodiment 1, at reaction temperature 180 ℃, C NO =C NH3 =0.2%, C O2 = 5%, air speed = 40000h -1 Under certain test conditions, the catalytic reduction efficiency of the catalyst remains above 85%.

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Abstract

The invention relates to a catalyst for low-temperature denitration of power-plant flue gas by selective catalytic reduction (SCR) and a preparation method thereof. Tungsten-doped titanium pigment synthesized by metatitanic acid serous fluid and ammonium paratungstate oxalic acid solution which are manufactured in China is used as the carrier of the catalyst to largely reduce the cost. The catalyst uses cerium oxides as main active components and titanium dioxides as carriers, two or more of oxides of valence-variable metal manganese, iron, vanadium or chromium are added as catalyst promoters,and additionally, silicon oxides are added to increase the strength of the catalyst. The denitration efficiency of the catalyst prepared by the method reaches more than 90% at 180 DEG C; at 200 DEG C, the activity approximates to 100%, and the catalyst has favorable capability for resisting SO2 poisoning; and at the reaction temperature of 200 DEG C, the added SO2 hardly has effect on the activity of the catalyst.

Description

technical field [0001] The invention relates to a catalyst for low-temperature denitrification of flue gas in an ammonia selective catalytic reduction (SCR) power plant and a preparation method thereof Background technique [0002] Most of my country's large power plants are conventional coal-fired power plants. Nitrogen oxide (NOx) is one of the main pollutants emitted by coal-fired power plants. According to its formation mechanism, it is mainly controlled by low-NOx combustion technology or flue gas removal. Ammonia is the choice of reducing agent. Sexual catalytic reduction (SCR) is currently an effective method for flue gas denitrification, and most commercial catalysts are V 2 o 5 / TiO 2 The applicable temperature of the catalyst is 300-400°C, so the installation position of the SCR reactor in the power plant is mostly located before the boiler system air preheater and electrostatic precipitator, so the high concentration of soot in the flue gas will affect the deni...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56B01D53/76B01J23/10B01J32/00B01J37/00
Inventor 赵晓林马少丹孙海军何冬青
Owner 河北晶锐瓷业有限公司
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