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Honeycomb SCR smoke denitration catalyst embryoid body and preparation method thereof

A denitration catalyst and honeycomb technology are applied in the field of honeycomb SCR flue gas denitration catalyst embryo body and its preparation, which can solve the problems such as the inability to meet the performance requirements of flue gas denitration catalyst, the preparation method is complicated in operation, and the application scope is narrow, and the plasticity is achieved. Excellent, high denitration efficiency, easy to operate

Active Publication Date: 2013-08-28
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent with the authorized notification number CN101074161B discloses an aluminum titanate-mullite honeycomb ceramic and its preparation method. Firstly, the aluminum titanate and mullite are combined to form a composite material according to the performance requirements, and then the configured composite material is added. The plasticizing modifier and self-designed mould, the green body is obtained after mixing, mixing and extruding, and then dried and roasted to obtain a honeycomb structure. This preparation method is more complicated to operate and has a narrow scope of application. The obtained honeycomb structure cannot meet the performance requirements of catalysts required in the field of flue gas denitration
[0005] The Chinese patent with the authorized announcement number CN101502796B discloses an integral honeycomb selective catalytic reduction flue gas denitrification catalyst and its preparation method. The catalyst uses nano-titanium dioxide as the carrier and skeleton, and the denitrification active components are evenly distributed in the skeleton, and an appropriate proportion of combined agent, its weight percentage is: nano-titanium dioxide 60-85%, active component 4-25%, binder 5-20%, this catalyst is suitable for the treatment of large-scale power plant boiler tail gas, but the denitrification efficiency is low

Method used

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  • Honeycomb SCR smoke denitration catalyst embryoid body and preparation method thereof
  • Honeycomb SCR smoke denitration catalyst embryoid body and preparation method thereof
  • Honeycomb SCR smoke denitration catalyst embryoid body and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1 Preparation of honeycomb SCR flue gas denitration catalyst embryo

[0027] Stir and mix 10 g of ammonium metavanadate, 20 g of ammonium metatungstate, 25 g of niobium oxalate, and 20 ml of an oxalic acid aqueous solution with a concentration of 60% by mass at 50° C. to obtain a mixed solution;

[0028] Put 412g of titanium dioxide, 80g of white clay, 10ml of lactic acid aqueous solution with a mass percentage concentration of 50%, 3g of stearic acid, 275ml of deionized water, and the above mixed solution into a mixer for one time mixing at 80°C for 42min. Then add 80g of ceramic fiber (F-1260 type ceramic fiber, Zhejiang Deqing Lanya Crystal Fiber Co., Ltd.), 3g of fluff pulp (Xinwen Fiber Material Processing Factory in Daye City, Hubei), 2g of hydroxypropyl methylcellulose, glycerin 20ml and 40ml deionized water were mixed for the second time, and mud embryos were obtained after 15 minutes of mixing;

[0029] Wrap the mud embryos with plastic film, and place them i...

Embodiment 2

[0032] Example 2 Preparation of honeycomb SCR flue gas denitration catalyst embryo body

[0033] Stir and mix 2 g of ammonium metavanadate, 40 g of ammonium metatungstate, 5 g of niobium oxalate, and 35 ml of an oxalic acid aqueous solution with a concentration of 60% by mass at 50° C. to obtain a mixed solution;

[0034] Put 590g of titanium dioxide, 11g of white clay, 15ml of aqueous lactic acid solution with a mass percentage concentration of 50%, 8g of stearic acid, 210ml of deionized water, and mixed solution into the mixer for one time mixing at 80℃, and after mixing for 60 minutes Then add 30g of ceramic fiber, 20g of fluff pulp, 10g of hydroxypropyl methylcellulose, 25ml of glycerin, and 50ml of deionized water for secondary mixing. After mixing for 10 minutes, mud embryos are obtained;

[0035] Wrap the mud embryos with plastic film and place them in a cool and humid place (the temperature is about 15℃) for aging treatment, aging time is 6h;

[0036] Put the stale embryo body...

Embodiment 3

[0038] Example 3 Preparation of honeycomb SCR flue gas denitration catalyst embryo body

[0039] Stir and mix 5 g of ammonium metavanadate, 20 g of ammonium metatungstate, 3 g of niobium oxalate, and 30 ml of an oxalic acid aqueous solution with a concentration of 60% by mass at a temperature of 50° C. to obtain a mixed solution;

[0040] Put 525g of titanium dioxide, 30g of white clay, 12ml of lactic acid aqueous solution with a mass percentage concentration of 50%, 10g of stearic acid, 230ml of deionized water, and the mixed solution into the mixer for one time mixing at 80°C. After mixing for 55 minutes Then add 50g of ceramic fiber, 10g of fluff pulp, 5g of hydroxypropyl methylcellulose, 20ml of glycerin, and 50ml of deionized water for secondary mixing. After mixing for 15 minutes, mud embryos are obtained;

[0041] Wrap the mud embryos with plastic film and place them in a cool and humid place (the temperature is about 20℃) for stale treatment, the stale time is 8h;

[0042] Put...

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Abstract

The invention discloses a honeycomb SCR (Selective Catalytive Redution) smoke denitration catalyst embryoid body and a preparation method thereof. The honeycomb SCR smoke denitration catalyst body consists of the following raw materials as per percentage by weight: 40 to 60 percent of titanium dioxide, 1 to 10 percent of white clay, 0.1 to 1 percent of ammonium metavanadate, 1 to 8 percent of ammonium meta-tungstate, 0.1 to 3 percent of niobium oxalate, 0.5 to 3 percent of lactic acid aqueous solution, 1 to 5 percent of oxalic acid aqueous solution, 25 to 35 percent of deionized water, 1 to 10 percent of ceramic fiber, 0.1 to 3 percent of fluff pulp, 0.1 to 1 percent of stearic acid, 0.1 to 1 percent of hydroxypropyl methyl cellulose and 1 to 5 percent of glycerol. The honeycomb SCR smokedenitration catalyst embryoid body has high plasticity, caking property and mechanical strength. The method is simple and convenient in operation and low in cost. Each component of the prepared catalyst body is dispersed uniformly; the catalyst body is easy in forming and demolding in the extrusion process and has high finished product rate; and the catalyst prepared by the embryoid body has highdenitration efficiency.

Description

Technical field [0001] The invention relates to the technical field of exhaust gas treatment, in particular to a honeycomb SCR flue gas denitration catalyst embryo body and a preparation method thereof. Background technique [0002] With the promulgation of the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), the emission standards for nitrogen oxides have become more stringent. Selective Catalytic Reduction (SCR) has high denitrification efficiency and can well control the emission of nitrogen oxides from thermal power plants. It is currently the most efficient way to control nitrogen oxides and will gradually become the mainstream technology for flue gas denitration. The catalyst is the core of the SCR technology. Because the SCR process is mostly arranged in the high ash section between the economizer and the air preheater, the catalyst is in the flue gas with high dust. If the granular catalyst is used, it will cause the blockage of the bed and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J35/04B01D53/86B01D53/56
Inventor 高翔陈泉骆仲泱岑可法倪明江宋浩吴卫红吴华施正伦周劲松方梦祥余春江王树荣程乐鸣王勤辉
Owner ZHEJIANG UNIV
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