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A kind of simultaneous denitrification, demercury and dedioxin rare earth-based catalyst, its preparation method and application

A technology for removing dioxins and catalysts, which is applied in the field of flue gas purification in chemical plants and coal-fired power plants, and achieves the effects of simple preparation process, excellent resistance to sulfur poisoning, and environmental friendliness

Active Publication Date: 2019-11-05
NANJING TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a kind of simultaneous denitrification, mercury, and dioxin removal rare earth-based catalysts aimed at the current situation and existing problems of industrial denitrification, mercury removal, and dioxin removal in existing coal-fired power plants. Another object of the present invention is to Provide the preparation method of the above catalyst, especially suitable for flue gas purification in coal-fired power plants, chemical plants and other fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of active component precursor solution

[0030] Weigh 2.498g cerium nitrate hexahydrate, 0.024g erbium nitrate hexahydrate and 0.504g ascorbic acid, add 12.610g deionized water and place in a 50°C constant temperature water bath and stir for 30min until the solution is clear and transparent and the viscosity reaches 500cP to obtain the active component Precursor solution;

[0031] (2) Co-catalyst precursor ion solution configuration

[0032] Weigh 13.076g of zirconium oxychloride octahydrate and 2.615g of ascorbic acid, add 13.076g of deionized water and place in a constant temperature water bath at 60°C and stir for 60min until the solution is clear and transparent and the viscosity reaches 1000cP to obtain the co-catalyst precursor ion solution;

[0033] (3) Preparation of catalyst carrier

[0034] Measure 5mL of tetrabutyl titanate, 10mL of 2.5M hydrochloric acid and 50mL of deionized water, put them in a hydrothermal reaction kettle, heat at 180°C ...

Embodiment 2

[0042] (1) Preparation of active component precursor solution

[0043] Weigh 11.015g of anhydrous cerium chloride, 4.679g of erbium chloride hexahydrate and 3.139g of ascorbic acid, add 15.694g of deionized water and place in a 60°C constant temperature water bath and stir for 60min until the solution is clear and transparent and the viscosity reaches 1000cP, and the active Component precursor solution;

[0044] (2) Co-catalyst precursor ion solution configuration

[0045] Weigh 2.058g of manganese nitrate (50wt.%) solution and 0.412g of ascorbic acid, add 2.058g of deionized water and place in a 50°C constant temperature water bath and stir for 30min until the solution is clear and transparent and the viscosity reaches 500cP to obtain the co-catalyst precursor ion solution ;

[0046] (3) Preparation of catalyst carrier

[0047] Measure 5mL of tetrabutyl titanate, 10mL of 2.5M hydrochloric acid and 50mL of deionized water, put them in a hydrothermal reaction kettle, heat at...

Embodiment 3

[0055] (1) Preparation of active component precursor solution

[0056] Weigh 11.015g of anhydrous cerium chloride, 4.679g of erbium chloride hexahydrate and 3.139g of ascorbic acid, add 15.694g of deionized water and place in a 60°C constant temperature water bath and stir for 60min until the solution is clear and transparent and the viscosity reaches 1000cP, and the active Component precursor solution;

[0057] (2) Co-catalyst precursor ion solution configuration

[0058] Weigh 16.964g of yttrium nitrate hexahydrate and 3.393g of ascorbic acid, add 16.964g of deionized water and place in a 60°C constant temperature water bath and stir for 60min until the solution is clear and transparent and the viscosity reaches 1000cP to obtain the ion solution of the co-catalyst precursor;

[0059] (3) Preparation of catalyst carrier

[0060] Measure 5mL of tetrabutyl titanate, 10mL of 2.5M hydrochloric acid and 50mL of deionized water, put them in a hydrothermal reaction kettle, heat at...

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Abstract

The invention discloses a rare-earth-based catalyst achieving denitration, demercuration and dioxin removal simultaneously, a preparation method and application. Cerium oxide and erbium oxide are adopted as catalytic active components, a mixture of zirconium oxide and / or yttrium oxide and / or manganese oxide is adopted as a promoter, and titanium dioxide submicro spheres generated by optimizing andmodifying tetrabutyl titanate with hydrochloric acid are adopted as a main carrier. An active component and promoter precursor compound solution, the optimized and modified catalyst carrier and an organic forming additive are stirred to be uniform, mixed, aged and extrude-molded, drying and roasting are carried out, and the rare-earth-based catalyst is prepared. The catalyst is environmentally friendly, denitration, demercuration and dioxin removal can be carried out efficiently at the same time, the active temperature interval is wide, the mechanical strength is high, the oxidation efficiency of SO2 is low, and the cost is low. The denitration efficiency and the dioxin removal efficiency at the temperature of 220 DEGC to 400 DEG C are higher than 90%, and the demercuration efficiency ishigher than 95%. The rare-earth-based catalyst can be widely suitable for the fields of coal-fired power plants, chemical plants and the like.

Description

technical field [0001] The invention relates to a rare earth-based catalyst for simultaneous denitrification, mercury and dioxin removal and its preparation method and application, belonging to the field of environmental protection catalytic materials and air pollution control, and the products prepared by the method are especially suitable for coal-fired power plants, chemical plants and other fields Flue gas purification. Background technique [0002] Nitrogen oxides (NO x ) is one of the causes of pollutants such as smog and acid rain. Mercury can cause damage to the human nervous system. Dioxins, especially 2,3,7,8-tetrachlorodibenzo-p-dioxin ( 2,3,7,8-TCDD) are the most toxic pollutants known so far, and these three types of air pollutants will seriously endanger human health and the ecological environment. Coal-fired power plants as NO x The largest stationary source of emissions, but also produce traces of zero-valent mercury and traces of dioxins, becoming a key i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J23/34B01D53/86B01D53/70B01D53/72B01D53/64B01D53/56
CPCB01D53/8628B01D53/8665B01D53/8668B01D2255/206B01D2255/2065B01D2255/20707B01D2255/20715B01D2255/2073B01D2258/0283B01J23/10B01J23/34
Inventor 沈岳松金奇杰王建海
Owner NANJING TECH UNIV
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