Honeycomb SCR smoke denitration catalyst embryoid body and preparation method thereof

A technology of denitrification catalyst and honeycomb shape, which is applied in the field of honeycomb SCR flue gas denitrification catalyst body and its preparation. Excellent, high denitrification efficiency, high mechanical strength

Active Publication Date: 2012-08-01
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 requirement

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 body

[0027] Stir and mix 10 g of ammonium metavanadate, 20 g of ammonium metatungstate, 25 g of niobium oxalate and 20 ml of an aqueous oxalic acid 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 concentration of 50% by mass, 3g of stearic acid, 275ml of deionized water, and the above mixed solution into a mixer and kneaded once at 80°C for 42min. Then add ceramic fiber 80g (F-1260 type ceramic fiber, Zhejiang Deqing Lanya Crystal Fiber Co., Ltd.), fluff pulp 3g (Hubei Daye Xinwen Fiber Material Processing Factory), hydroxypropyl methylcellulose 2g, glycerin 20ml and 40ml of deionized water were mixed for the second time, and the mud embryo was obtained after mixing for 15min;

[0029] Wrap the mud embryo with plastic film, put it in a cool and humid place (th...

Embodiment 2

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

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

[0034] Put 590g of titanium dioxide, 11g of white clay, 15ml of lactic acid aqueous solution with a concentration of 50% by mass, 8g of stearic acid, 210ml of deionized water, and the mixed solution into a mixer for one-time mixing at 80°C, and after mixing for 60min 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, and the mud embryo is obtained after mixing for 10 minutes;

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

[...

Embodiment 3

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

[0039] 5 g of ammonium metavanadate, 20 g of ammonium metatungstate, 3 g of niobium oxalate and 30 ml of an aqueous oxalic acid solution with a concentration of 60% by mass were stirred and mixed 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 concentration of 50% by mass, 10g of stearic acid, 230ml of deionized water, and the mixed solution into a mixer and kneaded at 80°C for one time. After kneading for 55min Then add 50g of ceramic fiber, 10g of fluff pulp, 5g of hydroxypropyl methylcellulose, 20ml of glycerol, and 50ml of deionized water for secondary mixing, and the mud embryo is obtained after mixing for 15 minutes;

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

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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 Standards for Air Pollutants from 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 in thermal power plants. The catalyst is the core of the SCR technology. Since the SCR process is mostly arranged in the high-ash section between the economizer and the air preheater, the catalyst is in the high-dust flue gas. If the granular catalyst is used, the bed will be blocked and resistance The increase of the pressure drop increases the pressure, and the reaction cannot run continuously and stably for a long time. Therefore, commercial...

Claims

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Application Information

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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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