Cellular Mn-Ti-based catalyst for low-temperature selective catalytic reduction denitration reaction and preparation method and using method

A catalyst and selective technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of reducing denitrification efficiency and catalyst deactivation, and achieve high Catalytic activity, good dispersion, lower operating temperature and lower operating costs

Inactive Publication Date: 2011-01-19
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, although the low-temperature SCR system is placed after the desulfurization and/or dust removal equipment, the sulfur dioxide in the flue gas has not been completely removed, and the flue gas in this process section will still contain low concentrations of residual SO 2 ,

Method used

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  • Cellular Mn-Ti-based catalyst for low-temperature selective catalytic reduction denitration reaction and preparation method and using method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Catalyst preparation: use n-butyl titanate, ethanol, water and manganese nitrate as raw materials, and the molar ratio of each raw material is 1:5:1:0.4. After the components are fully mixed, they are stirred rapidly, and after stirring for two hours, they are poured into polyfour In a high-pressure reaction kettle lined with vinyl fluoride, put it in a muffle furnace for hydrothermal reaction at 120°C for 12 hours, then put the suspension in the reaction kettle into a centrifuge for high-speed centrifugation, and remove the upper layer after the centrifugation The clear liquid is cleaned with ethanol, centrifuged and filtered again after cleaning, and then the milky substance is put into an oven for drying to obtain a solid powder Mn-Ti catalyst.

[0046] Get 1000g of the catalyst powder prepared above, add 10g polyethylene oxide, 10mL glycerin, 600mL titanium tetrachloride aqueous solution (containing TiO 2 60g), 5g rod-shaped glass fibers, kneaded in a kneader for 4...

Embodiment 2

[0050] The preparation was carried out according to the steps of Example 1, except that the molding binder was changed to 800 mL of titanium gel solution, and the molar ratio of Ce:V:Se:Sb:Bi in the precursor solution was changed to 8:1:1:0.5:1.5. Other reagents, addition amount and operation are all according to Example 1, and the obtained catalyst is used for low-temperature SCR denitration reaction, and the results of reaction conditions and activity are shown in Table 1.

Embodiment 3

[0052] Prepare according to the steps of Example 1, except that when preparing the powder catalyst, manganese nitrate is replaced by manganese acetate, the lubricant is changed into 7mL polyacrylate, the reinforcing agent is changed into 5g carbon fiber, and the Ce in the precursor solution: V: Se :Sb:Bi molar ratio was changed to 5:2:0.7:0.6:0.5. Other reagents, addition amount and operation are all according to Example 1, and the obtained catalyst is used for low-temperature SCR denitration reaction, and the results of reaction conditions and activity are shown in Table 1.

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Abstract

The invention discloses a cellular Mn-Ti-based catalyst for low-temperature selective catalytic reduction (SCR) denitration reaction, and a preparation method and a using method. The catalyst comprises the following components in molar percent: 40 to 60 percent of TiO2, 5 to 16 percent of MnO2, 3 to 7 percent of Mn2O3, 2 to 4 percent of Mn3O4, 2 to 8 percent of CeO2, 1 to 3 percent of V2O5, 0.5 to 1 percent of Se, 0.5 to 1 percent of Sb, and 0.15 to 1.5 percent of Bi. The preparation method comprises the following steps of: first preparing Mn-Ti catalyst powder by a hydrothermal method, and then preparing modified cellular Mn-Ti-based catalyst by processes such as extrusion forming, soaking and the like so as to improve the low temperature SCR activity and the sulfur poisoning resisting capability of the catalyst. Furthermore, the catalyst prepared by the method has the advantages of high mechanical strength, high dispersibility of active substances and difficult sintering, can be applied to the low temperature SCR denitration reaction of flue gas, is directly arranged behind a dust removing device even a desulfurizing device, can greatly reduce the operational temperature and operation cost of the traditional SCR process, and has high nitrogen oxide removing rate at the temperature of about 100 DEG C.

Description

technical field [0001] The invention relates to a catalyst, in particular to a honeycomb Mn-Ti-based catalyst used for low-temperature selective catalytic reduction denitrification reaction and a preparation and use method. Background technique [0002] NO emissions from stationary sources (coal-fired power plants, industrial boilers, etc.) X , to NH 3 Selective Catalytic Reduction (SCR) as a reducing agent is currently the most researched, most widely used, and most effective flue gas NO X removal technique. The most mature catalyst currently used is V 2 o 5 / TiO 2 or at V 2 o 5 / TiO 2 The main advantages of catalysts modified on the basis of carbon dioxide are high activity and high sulfur resistance, but such catalysts only have high activity when the operating temperature is higher than 350 ° C, so the SCR reactor can only be arranged in coal-saving Between the filter and the dust collector. However, most of the existing boilers do not reserve denitrification s...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/04B01D53/86B01D53/56
Inventor 金瑞奔金均韦彦斐顾震宇许明海朱虹范海燕
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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