Honeycomb manganese denitration catalyst and preparation method thereof

A denitrification catalyst and honeycomb technology, which is applied in the field of honeycomb manganese-based denitration catalyst and its preparation, can solve problems such as cracking and large temperature difference between inner and outer surfaces, and achieve high denitrification activity, increased loading area, and excellent pore structure.

Active Publication Date: 2017-02-22
CHINA BUILDING MATERIALS ACAD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The active components in manganese-cerium-titanium system catalytic materials are oxides of different valence states, which require manganese to be oxidized during the calcination process of the catalytic material. This is mainly because the melting point of manganese-cerium salt is low, and ceri

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  • Honeycomb manganese denitration catalyst and preparation method thereof
  • Honeycomb manganese denitration catalyst and preparation method thereof

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preparation example Construction

[0025] A kind of preparation method of honeycomb manganese series denitration catalyst that one embodiment of the present invention proposes, it comprises the following steps:

[0026] 1) dissolving manganese salt and complexing agent in water, adding titanium dioxide, stirring, ultrasonic impregnation, drying, and grinding to obtain Mn-Ti oxide solid particles; wherein, the concentration of the complexing agent is 3-5mol / L, the molar ratio of manganese salt to complexing agent is 65-187:1; wherein, the frequency of ultrasound is 10-30KHz, and the time of ultrasonic impregnation is 1-2 hours, and the manganese salt and titanium dioxide can be fully contacted by ultrasonic impregnation ;The drying temperature is 105-250°C, and the drying time is 20-30h. By drying, the manganese salt is decomposed in advance to form manganese oxides and release gas, which can reduce the heat loss of the honeycomb body during the drying and calcination process. The amount of volatile matter is n...

Embodiment 1

[0040] Dissolve 9.76kg of 50wt% manganese nitrate and 100ml of oxalic acid solution with a concentration of 3mol / L in 5000mL of deionized water, add 10kg of titanium dioxide powder, stir for 0.5h, ultrasonically impregnate at 25KHz for 2h, and dry in an oven at 205°C for 24h , grinding to obtain a particle size of 300-400 purpose Mn-Ti oxide solid particles; 988gCo(NO 3 ) 3 ·6H 2 O and 930gCe(NO 3 ) 3 ·6H 2 O was dissolved in 3000ml of water to obtain a mixed metal solution; 10kg of Mn-Ti oxide solid particles were added to the mixed metal solution and stirred, and then 500g of activated carbon, 100g of carboxymethyl cellulose and 100g of polyethylene oxide, 300g of glycerin, and 500g were added Glass fiber to obtain a mixed mud mass; place the mixed mud mass in a mud mill for vacuum mixing 3 times, seal and stale the mixed mud for 2 days, send it into an extruder, and extrude it into a honeycomb body blank; The honeycomb body blank was dried in an oven at 60°C for 6 hour...

Embodiment 2

[0042] Dissolve 13.02kg of 50wt% manganese nitrate and 100ml of 4mol / L oxalic acid solution in 3500mL of deionized water, add 10kg of titanium dioxide powder, stir for 0.5h, ultrasonically impregnate at 20KHz for 1h, and dry in an oven at 185°C for 20h , grinding to obtain a particle size of 300-400 mesh Mn-Ti oxide solid particles; 993gFeSO 4 ·7H 2 O and 680gCe(C 2 h 3 o 2 ) 3 Dissolve in 3000ml of water to obtain a mixed metal solution; add 10kg of Mn-Ti oxide solid particles into the mixed metal solution and stir, then add 400g of starch, 100g of carboxymethyl cellulose and 100g of polyethylene oxide, 200g of soybean oil, and 400g of glass fibers to obtain a mixed mud mass; place the mixed mud mass in a mud mill for vacuum mixing 2 times, seal and stale the mixed mud material for 3 days, send it into an extruder, and extrude it into a honeycomb body blank; The honeycomb body blank was dried in an oven at 50°C for 7 hours, then the temperature was raised to 100°C for 13...

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Abstract

The invention relates to a honeycomb manganese denitration catalyst and a preparation method thereof. The method includes the following steps that manganese salt and a complexing agent are dissolved in water, titanium dioxide is added and stirred, ultrasonic dipping, drying and grinding are conducted, and Mn-Ti oxide solid particles are obtained, wherein the molar ratio of the manganese salt to the complexing agent is (65-187):1; metal salt and cerium salt are dissolved in water to obtain a mixed metal solution, wherein metal salt is at least one of ferric salt, cobalt salt, lanthanum salt, antimony salt and nickel salt; a pore-forming agent, an adhesive, an extrusion aid, a reinforcing agent, the Mn-Ti oxide solid particles and the mixed metal solution are mixed and formed into a honeycomb blank, and drying and forging are conducted. The catalyst is good in active component dispersity, is not easily sintered, good in pore structure, large in porosity and high in mechanical strength, the axial compressive strength of the catalyst is 4.7-5.1 MPa, and the radial compressive strength of the catalyst is 1.2-1.4 MPa. The porosity of the catalyst is 84-90%. The catalyst prepared through the method has relatively high denitration activity in the range of 120-250 DEG C and is suitable for low-temperature denitration.

Description

technical field [0001] The invention relates to a catalyst, in particular to a honeycomb manganese-based denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, and it is the precursor to acid rain, secondary fine particles and other problems. Currently, in NO x Among the removal technologies, selective catalytic reduction (SCR, Selective Catalytic Reduction) denitrification has attracted widespread attention from all over the world for its mature technology and good denitrification effect, and is the most widely used flue gas denitrification technology in the world. [0003] At present, the widely used commercial catalysts are mainly V 2 o 5 -WO 3 / TiO 2 or V 2 o 5 -MoO 3 / TiO 2 , but this kind of catalyst has the disadvantages of narrow reaction window, high activation temperature, high denitrification activity only at 350-400 ° C, and vanadium is harmful to human body and env...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J35/04B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/8892B01J35/04B01J2523/00B01J2523/72B01J2523/47B01J2523/845B01J2523/3712B01J2523/842B01J2523/53B01J2523/847
Inventor 吴彦霞梁海龙赵春林陈鑫黄瀚涛唐婕霍艳丽王春朋胡利明
Owner CHINA BUILDING MATERIALS ACAD
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