Preparation method and application of MnO2/CoAl-LDO low temperature flue gas denitration catalyst

A denitration catalyst, low temperature flue gas technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. The high temperature of the working window can achieve the effect of good water resistance and sulfur resistance, good thermal stability and large specific surface area.

Active Publication Date: 2018-12-18
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 MnO2/CoAl-LDO low temperature flue gas denitration catalyst
  • Preparation method and application of MnO2/CoAl-LDO low temperature flue gas denitration catalyst
  • Preparation method and application of MnO2/CoAl-LDO low temperature flue gas denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Weigh 4.37 g of cobalt nitrate nonahydrate and 1.87 g of aluminum nitrate nonahydrate into a beaker, add 80.0 mL of deionized water into the beaker, stir with a magnetic stirrer for 10 min to completely dissolve, and set aside;

[0052] (2) Weigh 0.80 g of hexamethylenetetramine, add 56.0 mL of deionized water into a beaker to prepare it to a concentration of 0.10 mol L -1 The hexamethylenetetramine solution, stand-by;

[0053] (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;

[0054] (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 until neutral, and dried in an oven at 60 °C for 1...

Embodiment 2

[0064] (1) Weigh 2.91 g of cobalt nitrate nonahydrate and 1.87 g of aluminum nitrate nonahydrate into a beaker, add 70.0 mL of deionized water into the beaker, stir with a magnetic stirrer for 10 min to completely dissolve, and set aside;

[0065] (2) Weigh 0.61 g of hexamethylenetetramine, and add 45.0 mL of deionized water to a beaker to prepare it to a concentration of 0.10 mol L -1 The hexamethylenetetramine solution, stand-by;

[0066] (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;

[0067] (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 in an oven for 12 h at 60 °C, grind it, and set ...

Embodiment 3

[0073] (1) Weigh 4.37 g of cobalt nitrate nonahydrate and 1.87 g of aluminum nitrate nonahydrate into a beaker, add 80.0 mL of deionized water into the beaker, stir with a magnetic stirrer for 10 min to completely dissolve, and set aside;

[0074] (2) Weigh 0.80 g of hexamethylenetetramine, add 56.0 mL of deionized water into a beaker to prepare it to a concentration of 0.10 mol L -1 The hexamethylenetetramine solution, stand-by;

[0075] (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;

[0076] (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 in an oven for 12 h at 60 °C, grind it, and set it...

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PUM

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Abstract

The invention discloses a preparation method and an application of a MnO2 / CoAl-LDO low temperature flue gas denitration catalyst. A nitrate-intercalated CoAl hydrotalcite-like precursor (CoAl-NO3-LDH)is prepared by using cobalt nitrate nonahydrate and aluminum nitrate nonahydrate as raw materials and using hexamethylenetetramine (HMT) as a precipitant through the steps of preparation of a solution, hydrothermal treatment, suction filtration, washing and drying; a MnO2-intercalated CoAl hydrotalcite-like (CoAl-MnO2-LDH) is prepared by using permanganate ions as target anions and an oxidant through the steps of an ion exchange and redox reaction, suction filtration, washing and drying; and the CoAl-MnO2-LDH is calcined to obtain the MnO2 / CoAl-LDO low temperature flue gas denitration catalyst. The catalyst has good catalytic activity, high N2 selectivity and good water and sulfur resistance when applied to a low temperature (90-300 DEG C) ammonia selective catalytic reduction (NH3-SCR) denitration reaction.

Description

technical field [0001] The invention belongs to the field of gas purification and denitrification catalyst preparation, and specifically relates to a kind of MnO 2 Preparation method and application of CoAl-LDO low temperature flue gas denitrification 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 the strict tightening of regulations and policies, the efficient removal and emission reduction of nitrogen oxides has become a severe situation faced by relevant industrial production units. 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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/30B01J37/08B01J37/10B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/8892B01J37/08B01J37/10B01J37/30
Inventor 吴旭杜亚丽冯雅琳刘江宁刘利利
Owner TAIYUAN UNIV OF TECH
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