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Manganese based SCR catalyst for low temperature denitration and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as poisoning and channel blockage, achieve good practicability, significant beneficial effects, and facilitate industrialization and application Effect

Inactive Publication Date: 2016-03-02
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the SCR denitrification catalysts currently used in my country are mainly vanadium pentoxide, tungsten oxide (V 2 o 5 -WO 3 -TiO 2 ), although the denitrification activity and performance of the vanadium-based catalyst are stable, but its activity temperature is relatively high at 300°C to 400°C, and its SCR denitrification reactor must be arranged between the economizer and the air preheater in order to effectively use the boiler In addition, the fly ash and high sulfur content in the flue gas can easily cause the catalyst to be blocked and poisoned

Method used

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  • Manganese based SCR catalyst for low temperature denitration and preparation method thereof

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preparation example Construction

[0033] The present invention also provides a method for preparing the manganese-based SCR low-temperature denitrification catalyst, comprising the following steps: step 1, dispersion of the carrier; step 2, preparation of sludge; step 3, drying and roasting;

[0034] In the step one, the carrier TiO 2 Ultrasonic dispersion in deionized water, the ultrasonic dispersion parameter is 100WHz ~ 200WHz for 1h ~ 6h, forming a uniform suspension, in which the carrier TiO 2 Can be nanoscale anatase TiO 2 , the nanoscale TiO 2 Higher dispersibility, Mn active components can be dispersed on the surface of the carrier in an amorphous state, improving catalytic activity;

[0035] In said step 2, according to the active component MnO 2 , CeO 2 , Nb 2 o 5 The mass percentages of the three are 3% to 10%: 0.1% to 2%: 0.1% to 1%. Weigh the corresponding mass of active precursors manganese nitrate, cerium nitrate, and niobium oxalate, slowly add them to the suspension in step 1, and then ...

Embodiment 1

[0040] Manganese-based SCR low-temperature denitration catalysts were prepared according to the following steps:

[0041] Step 1, the dispersion of the carrier, weigh 100g nano-scale anatase TiO 2 Carrier, dispersed in 150ml deionized water, 200WHz ultrasonic dispersion for 1h to form a uniform suspension;

[0042] Step 2, the preparation of mud, according to the active component MnO 2 , CeO2 , Nb 2 o 5 The three accounted for 5%, 1%, and 0.5% of the mass percentage of the catalyst product. Weighed the corresponding mass of active precursors manganese nitrate, cerium nitrate, and niobium oxalate, slowly added to the suspension in step 1, and then added 1g carboxymethyl fiber element and 1g polyoxyethylene, 10000rpm high-speed stirring for 3 hours to form a uniformly mixed mud;

[0043] Step 3, drying and roasting, put the sludge into an oven to dry at 110°C for 12 hours, and then put it into a muffle furnace and roast at 600°C for 6 hours to obtain a manganese-based SCR lo...

Embodiment 2

[0046] Manganese-based SCR low-temperature denitration catalysts were prepared according to the following steps:

[0047] Step 1, the dispersion of the carrier, weigh 100g nano-scale anatase TiO 2 Carrier, dispersed in 150ml deionized water, 100WHz ultrasonic dispersion for 6h to form a uniform suspension;

[0048] Step 2, the preparation of mud, according to the active component MnO 2 , CeO 2 , Nb 2 o 5 The three account for 5%, 2%, and 0.5% of the mass percentage of the catalyst product. Weigh the corresponding mass of active precursors manganese nitrate, cerium nitrate, and niobium oxalate, slowly add them to the suspension in step 1, and then add 0.5g carboxymethyl Cellulose and 0.5g polyethylene oxide, 3000rpm high-speed stirring for 6h, forming a uniformly mixed mud;

[0049] Step 3, drying and roasting, put the sludge into an oven to dry at 110°C for 10 hours, and then put it into a muffle furnace and roast at 600°C for 4 hours to obtain a manganese-based SCR low-t...

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Abstract

The invention relates to a manganese based SCR (selective catalytic reduction) catalyst for low temperature denitration and belongs to the technical field of industrial denitration. The manganese based SCR catalyst for low temperature denitration is prepared by mixing the active components containing 3-10 wt.% of MnO2, 0.1-2 wt.% of CeO2 and 0.1-1 wt.% of Nb2O5, and the balance of a carrier TiO2. According to the technical scheme, MnO2, CeO2 and Nb2O5 are mixed to overall achieve the active window of the manganese based metal oxide catalyst within 150 DEG C to 260 DEG C, and the SCR reactor can be arranged after a dust removal device and a desulfurization device, in order to avoid hole plugging and poisoning in the use process of the catalyst improve the service life of the catalyst, and reach the removal denitrification efficiency of the catalyst to above 90%. The invention also relates to a preparation method of the catalyst. The preparation method has good practicality, and is easy for industrialized popularization and application.

Description

technical field [0001] The invention relates to a denitration catalyst, in particular to a manganese-based SCR low-temperature denitration catalyst, and also relates to a preparation method of the catalyst, which belongs to the technical field of industrial denitration. Background technique [0002] Accompanied by the rapid economic development, it has caused a series of social problems such as accelerated energy consumption and increased environmental pollution. The root causes of environmental pollution phenomena such as acid rain, photochemical smog, and greenhouse effect come from NO, N 2 O, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 and other nitrogen oxides (NOx). More than 90% of NOx is industrial kiln exhaust gas produced by the combustion of coal, natural gas, oil, etc. in power plants and cement plants. The ecological environment has caused serious harm, so the task of controlling NOx emissions is very arduous. [0003] Under the increasingly serious situation o...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/56
Inventor 许小兵刘江峰徐辉
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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