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Preparation method and application of low-temperature flue gas denitration catalyst based on CoMnAl layered double hydroxide

A denitration catalyst, low temperature flue gas technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Improve anti-SO2 poisoning ability, improve catalytic performance, good thermal stability effect

Active Publication Date: 2018-12-04
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the V-W-Ti system and its modified catalysts are relatively mature in this application field. However, the working window temperature for its excellent catalytic performance is relatively high (300-400 ℃), which cannot well meet the working conditions such as low temperature and wide working temperature window. Therefore, the research and development of a new type of vanadium-free, low-temperature, high-efficiency, and stable performance environment-friendly catalyst that matches the actual working conditions has become a hot spot in the field of this technology research.

Method used

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  • Preparation method and application of low-temperature flue gas denitration catalyst based on CoMnAl layered double hydroxide
  • Preparation method and application of low-temperature flue gas denitration catalyst based on CoMnAl layered double hydroxide
  • Preparation method and application of low-temperature flue gas denitration catalyst based on CoMnAl layered double hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Weigh 4.366 g of cobalt nitrate nonahydrate, 1.876 g of aluminum nitrate nonahydrate, measure 1.2 mL of manganese nitrate into a beaker, add 80.0 mL of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to dissolve them completely ,stand-by;

[0044] (2) Weigh 1.875 g of hexamethylenetetramine, and add 183.0 mL of deionized water into the beaker to prepare it to a concentration of 0.10 mol L -1 The hexamethylenetetramine solution, stand-by;

[0045] (3) Add the above-prepared hexamethylenetetramine solution into the above-prepared mixed nitrate solution, stir vigorously at 800r / min for 30 minutes, and then seal the obtained precipitate and mother liquor in polytetrafluoroethylene In an ethylene-lined stainless steel reactor, heat in an oven at 140 °C for 12 h;

[0046] (4) After the reaction kettle is naturally cooled, filter the reacted solution to obtain the precipitate, wash it with deionized water several times until neutral, put it i...

Embodiment 2

[0054] (1) Weigh 2.911 g of cobalt nitrate nonahydrate, 1.876 g of aluminum nitrate nonahydrate, measure 2.4 mL of manganese nitrate into a beaker, add 70.0 mL of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to dissolve them completely ,stand-by;

[0055] (2) Weigh 1.875 g of hexamethylenetetramine, and add 183.0 mL of deionized water into the beaker to prepare it to a concentration of 0.10 mol L -1 The hexamethylenetetramine solution, stand-by;

[0056] (3) Add the above-prepared hexamethylenetetramine solution into the above-prepared mixed nitrate solution, stir vigorously at 800r / min for 30 minutes, and then seal the obtained precipitate and mother liquor in polytetrafluoroethylene In an ethylene-lined stainless steel reactor, heat in an oven at 140 °C for 12 h;

[0057] (4) After the reaction kettle is naturally cooled, filter the reacted solution to obtain the precipitate, wash it with deionized water several times until neutral, put it i...

Embodiment 3

[0061] (1) Weigh 1.455 g of cobalt nitrate nonahydrate, 1.876 g of aluminum nitrate nonahydrate, measure 3.6 mL of manganese nitrate into a beaker, add 63.0 mL of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to dissolve them completely ,stand-by;

[0062] (2) Weigh 1.875 g of hexamethylenetetramine, and add 183.0 mL of deionized water into the beaker to prepare it to a concentration of 0.10 mol L -1 The hexamethylenetetramine solution, stand-by;

[0063] (3) Add the above-prepared hexamethylenetetramine solution into the above-prepared mixed nitrate solution, stir vigorously at 800r / min for 30 minutes, and then seal the obtained precipitate and mother liquor in polytetrafluoroethylene In an ethylene-lined stainless steel reactor, heat in an oven at 140 °C for 12 h;

[0064] (4) After the reaction kettle was naturally cooled, the reacted solution was suction-filtered to obtain a precipitate, which was washed with deionized water several times u...

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Abstract

The invention discloses a preparation method and application of a low-temperature flue gas denitration catalyst based on CoMnAl layered double hydroxide. The preparation of the catalyst is divided into two steps. The first step comprise: by taking cobalt nitrate nonahydrate, aluminum nitrate nonahydrate and a manganese nitrate solution with a mass fraction of 50% as raw materials, taking hexamethylenetetramine (HMT) as a precipitant and taking deionized water as a solvent and a detergent, performing solution preparation, hydrothermal treatment, suction filtration, washing and drying to obtaina CoMnAl layered double hydroxide precursor (CoMnAl-LDH); and the second step comprises roasting the obtained CoMnAl layered double hydroxide precursor to obtain a CoMnAl composite oxide catalyst (CoMnAl-LDO). After subjected to tableting and sieving, the prepared catalyst has good catalytic activity, high N2 selectivity and good water resistance and sulfur resistance when applied to low-temperature (90-300 DEG C) ammonia selective catalytic reduction (NH3-SCR) denitration reactions.

Description

technical field [0001] The invention belongs to the field of gas purification and denitration catalyst preparation, and in particular relates to a preparation method and application of a CoMnAl-like hydrotalcite-based low-temperature flue gas denitration catalyst. Background technique [0002] Nitrogen oxides (NO x ) as the main pollutant in the atmosphere seriously affects the ecological environment and endangers human health. With the enhancement of public awareness of environmental protection and stricter regulations and policies, the efficient removal and emission reduction of nitrogen oxides has made the situation faced by relevant industrial production units more and more severe. Ammonia selective catalytic reduction technology (NH 3 -SCR) has become a popular and highly efficient denitrification technology at home and abroad because the reaction conditions are easy to control, and has been widely used in production practice. At present, the V-W-Ti system and its mo...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J35/10B01J37/10B01J37/03B01J37/16B01D53/86B01D53/56
CPCB01D53/8628B01J23/007B01J23/8892B01J37/031B01J37/10B01J37/16B01D2257/406B01D2257/404B01D2258/0283B01J35/399B01J35/613B01J35/647
Inventor 吴旭冯雅琳刘雪贞刘利利刘江宁
Owner TAIYUAN UNIV OF TECH
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