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Preparation method and application of hydrotalcite-based CoMnFe composite metal oxide denitration catalyst

A denitrification catalyst and composite metal technology, which is applied in the field of preparation of hydrotalcite-based CoMnFe composite metal oxide denitration catalysts, can solve problems such as restricting water resistance and sulfur resistance, and achieve excellent water resistance and sulfur resistance, strong thermal stability, The effect of good catalytic activity

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

[0003] Manganese-based catalysts have become a research hotspot for low-temperature denitrification catalysts due to their excellent redox performance, but the strong oxidation of the catalytic active center restricts the water and sulfur resistance of manganese-based catalysts and the N 2 selectivity

Method used

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  • Preparation method and application of hydrotalcite-based CoMnFe composite metal oxide denitration catalyst
  • Preparation method and application of hydrotalcite-based CoMnFe composite metal oxide denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 8.80 g of cobalt nitrate hexahydrate, 5.050 g of ferric nitrate nonahydrate, measure 1.8 mL of manganese nitrate solution with a mass fraction of 50%, add them to the beaker in turn, and add deionized water to the beaker to the mark line of 100 mL place, and stirred with a magnetic stirrer for 10 min to dissolve it completely, and transferred the prepared solution to a 250 mL hanging bottle infusion set for use;

[0034] (2) Weigh 4.00 g of sodium hydroxide into a beaker, add a small amount of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to dissolve it completely. Transfer the dissolved solution to a 100 mL volumetric flask to make 1.00 mol L -1 sodium hydroxide aqueous solution, and then transfer it to a 250 mL hanging bottle infusion set for use;

[0035] (3) Sodium citrate aqueous solution: Weigh 0.370 g of sodium citrate solid and place it in a beaker, add 5 mL of deionized water to prepare a sodium citrate aqueous solution...

Embodiment 2

[0040] (1) Weigh 8.20 g of cobalt nitrate hexahydrate, 5.050 g of ferric nitrate nonahydrate, measure 2.2 mL of manganese nitrate solution with a mass fraction of 50%, add them to the beaker in turn, and add deionized water to the beaker to the mark line 100 mL and stir it with a magnetic stirrer for 10 min to dissolve it completely, then transfer the prepared solution to a 250 mL hanging bottle infusion set for use;

[0041] (2) Weigh 4.00 g of sodium hydroxide into a beaker, add a small amount of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to dissolve it completely. Transfer the dissolved solution to a 100 mL volumetric flask to make 1.00 mol L -1 sodium hydroxide aqueous solution, and then transfer it to a 250 mL hanging bottle infusion set for use;

[0042] (3 Sodium citrate aqueous solution: Weigh 0.370 g of sodium citrate solid and place it in a beaker, add 5 mL of deionized water to prepare a sodium citrate aqueous solution, place it in...

Embodiment 3

[0047] (1) Weigh 7.300 g of cobalt nitrate hexahydrate, 5.050 g of ferric nitrate nonahydrate, measure 2.9 mL of manganese nitrate solution with a mass fraction of 50%, add them to the beaker in turn, and add deionized water to the beaker to the mark line of 100 mL place, and stirred with a magnetic stirrer for 10 min to dissolve it completely, and transferred the prepared solution to a 250 mL hanging bottle infusion set for use;

[0048] (2) Weigh 4.000 g of sodium hydroxide into a beaker, add a small amount of deionized water into the beaker, and stir with a magnetic stirrer for 10 min to completely dissolve it. Transfer the dissolved solution to a 100 mL volumetric flask to make 1.00 mol L -1 sodium hydroxide aqueous solution, and then transfer it to a 250 mL hanging bottle infusion set for use;

[0049] (3) Sodium citrate aqueous solution: Weigh 0.370 g of sodium citrate solid and place it in a beaker, add 5 mL of deionized water to prepare a sodium citrate aqueous soluti...

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Abstract

The invention discloses a preparation method and application of a hydrotalcite-based CoMnFe composite metal oxide denitration catalyst and belongs to the field of pollution prevention and control. Thepreparation method comprises the steps: carrying out the steps including solution preparation, titration coprecipitation, hydrothermal treatment, suction filtration, washing and drying by taking cobalt nitrate hexahydrate, iron nitrate nonahydrate and manganese nitrate as raw materials, sodium hydroxide as a precipitator, sodium citrate as a complexing agent and deionized water as a solvent and adetergent to prepare a CoMnFe hydrotalcite (CoMnFe-LDHs) precursor; and roasting CoMnFe-LDHs at a certain temperature to obtain the CoMnFe composite metal oxide (CoMnFe-LDO) denitration catalyst. When being applied to ammonia selective catalytic reduction reaction (NH3-SCR), the obtained composite oxide shows excellent denitration activity (the temperature is 120-270 DEG C, the conversion rate ofNOx reaches 90% or above), high N2 selectivity and good water resistance and sulfur resistance.

Description

technical field [0001] The invention relates to the preparation and application of a hydrotalcite-based CoMnFe composite metal oxide denitration catalyst, and belongs to the technical field of denitration catalyst preparation. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants causing air pollution, and its main components are NO and NO 2 . NO x Pollution is extremely harmful to the environment and human beings. Environmental problems such as acid rain, photochemical smog, and greenhouse effect formed by the interaction between it and water vapor in the air have been paid more and more attention by people. With the continuous deepening of research, various denitrification technologies have been practiced in large quantities, among which selective catalytic reduction of ammonia (NH 3 -SCR) technology has become a popular and highly efficient denitrification technology at home and abroad. However, its actual denitrification performance is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J37/10B01D53/86B01D53/56
CPCB01D53/8628B01D2257/404B01D2257/406B01D2258/0283B01J23/002B01J23/8892B01J37/10B01J2523/00B01J2523/72B01J2523/842B01J2523/845
Inventor 吴旭刘雪贞孟浩冯雅琳次超
Owner TAIYUAN UNIV OF TECH
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