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Cerium supported medium temperature SCR (selective catalytic reduction) catalyst and preparation method thereof

An SCR catalyst, supported technology, applied in the field of catalysts, can solve the problems of shortening the catalyst life, high investment cost of transformation, increasing denitration cost, etc. Effect

Inactive Publication Date: 2015-01-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, the temperature required by commercial catalysts is relatively high, generally required to be controlled at 573 ~ 673K, and the SCR device must be placed before desulfurization and dust removal to avoid repeated heating of the flue gas. At this time, SO in the flue gas 2 Higher dust concentration will cause different degrees of catalyst deactivation, which will greatly shorten the life of the catalyst, and the investment cost of upgrading the existing boiler system is relatively high; if the SCR is placed in desulfurization in order to prolong the life of the catalyst and reduce investment After the dust removal device, since the temperature of the flue gas after desulfurization and dust removal is generally lower than 433K, the flue gas must be heated repeatedly, which will greatly increase the cost of denitrification

Method used

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  • Cerium supported medium temperature SCR (selective catalytic reduction) catalyst and preparation method thereof
  • Cerium supported medium temperature SCR (selective catalytic reduction) catalyst and preparation method thereof
  • Cerium supported medium temperature SCR (selective catalytic reduction) catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Titanium-zirconium solid solution (TiO 2 -ZrO 2 preparation of the carrier).

[0026] Preparation of TiO with a molar ratio of 1:1 by co-precipitation 2 -ZrO 2 Composite oxide: zirconium oxychloride octahydrate ZrOCl 2 ·8H 2 O (AR, produced by Sinopharm Chemical Reagent Co., Ltd.), titanium tetrachloride (TiCl 4 ) solution (density 1.73g / ml, AR, produced by Shanghai Lingfeng Chemical Reagent Co., Ltd.), ammonia water (AR, 28wt%, produced by Shanghai Pilot Chemical Corporation) and deionized water as raw materials. First use a clean graduated cylinder to measure 5.3995ml of TiCl 4 , Put the beaker with 300-400ml deionized water into the ice water bath, then add TiCl to the beaker at a rate of 1ml / min 4 . During the addition process, the beaker was mechanically stirred at a stirring speed of 45r / s, and then 15.8673g of ZrOCl was added 2 ·8H 2 O until the solution is clear. Then dropwise add 28wt% ammonia water to the solution at a rate of 3-5ml / min, a...

Embodiment 2

[0027] Example 2 10% CeO 2 / TiO 2 -ZrO 2 Preparation of (10%Ce / Ti-Zr) catalyst.

[0028] Carrier pretreatment: Take 2 g of the titanium-zirconium solid solution prepared in Example 1 and add it to 50 ml of deionized water to obtain an aqueous solution of the titanium-zirconium solid solution;

[0029] The loading of cerium oxide with a molar percentage of 10%: add 0.4275g Ce(NO 3 ) 3 ·6H 2 O, Stir evenly at 40~50r / s at 20°C for 2~2.5h, then stir at 80~90°C until the water evaporates to dryness (usually about 4 hours), put it in an oven and dry at 110°C for 12 hours Take out and grind until the particle size is greater than or equal to 60 mesh; finally put it into a muffle furnace and calcinate at 450°C for 4 hours to obtain 10% CeO 2 / TiO 2 -ZrO 2 Catalyst, wherein, 10% represents n(Ce):n(Ti):n(Zr)=0.1:1:1 in the prepared catalyst, n is the number of moles.

Embodiment 3

[0030] Example 3 20% CeO 2 / TiO 2 -ZrO 2 Preparation of (20%Ce / Ti-Zr) catalyst.

[0031] Carrier pretreatment: Take 2 g of the titanium-zirconium solid solution prepared in Example 1 and add it to 50 ml of deionized water to obtain an aqueous solution of the titanium-zirconium solid solution;

[0032] The loading of cerium oxide with a molar percentage of 20%: add 0.8550g Ce(NO 3 ) 3 ·6H 2 O, Stir evenly at 40~50r / s at 20°C for 2~2.5h, then stir at 80~90°C until the water evaporates to dryness (usually about 4 hours), put it in an oven and dry at 110°C for 12 hours Take it out and pass through a 60-mesh sieve after grinding; put it into a muffle furnace and calcinate at 450 ° C for 4 hours to obtain 20% CeO 2 / TiO 2 -ZrO 2 Catalyst, wherein 20% represents n(Ce):n(Ti):n(Zr)=0.2:1:1 in the prepared catalyst, n is the number of moles.

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Abstract

The invention discloses a cerium supported medium temperature SCR (selective catalytic reduction) catalyst. Titanium zirconium oxide is taken as a supporter, and cerium oxide is taken as an active ingredient, wherein a ratio of cerium to titanium to zirconium in the catalyst is (0.1-0.3):1:1. The invention also discloses a preparation method of the cerium supported medium temperature SCR catalyst. Compared with a single titanium zirconium composite oxide catalyst, the cerium supported medium temperature SCR catalyst has the advantages that as CeO2 is taken as the active ingredient, a catalyst denitration reaction temperature is lowered, denitration efficiency and heat resistance are obviously improved, an SCR activity temperature window is expanded, and a good modification effect on a TiO2-ZrO2 catalyst is achieved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a low-temperature denitrification SCR reaction catalyst in flue gas of a thermal power plant, in particular to a cerium-based supported medium-temperature SCR catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides are a major air pollutant. With the development of the national economy, the total discharge of nitrogen oxides in my country has increased year by year, and the pollution has become increasingly serious. In the past ten years, the acid rain pollution in some areas of my country is changing from the sulfuric acid type to the compound type of sulfuric acid and nitric acid. As the main emission source of nitrogen oxides in my country, it is imminent to reduce the emission of nitrogen oxides from coal-fired thermal power plants. [0003] Selective catalytic reduction (SCR) is currently the most widely used denitrification technology with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/90B01D53/56
Inventor 张亚平郭婉秋王龙飞沈凯徐海涛周长城
Owner SOUTHEAST UNIV
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