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Preparation method and application of hydrotalcite-like NiMnFe low temperature denitration catalyst

A low-temperature denitration, hydrotalcite-based technology, applied in chemical instruments and methods, chemical elements of heterogeneous catalysts, catalysts for physical/chemical processes, etc., can solve problems such as sintering and easy agglomeration, and achieve excellent catalytic performance and thermal stability. The effect of high and excellent water and sulfur resistance

Inactive 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

The composite metal oxide catalytic system prepared by the impregnation method often has the disadvantages of easy agglomeration and sintering

Method used

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  • Preparation method and application of hydrotalcite-like NiMnFe low temperature denitration catalyst
  • Preparation method and application of hydrotalcite-like NiMnFe low temperature denitration catalyst
  • Preparation method and application of hydrotalcite-like NiMnFe low temperature denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: c(Ni 2+ ):c(Mn 2+ ):c(Fe 3+ ) =2:0.5:1

[0038] (1) Weigh 11.63 g of nickel nitrate hexahydrate, 8.080 g of ferric nitrate nonahydrate, and dissolve 2.3 mL of manganese nitrate (50%) in 40 mL of distilled water, and stir with a magnetic stirrer for 10 min to completely dissolve until the solution is clear .

[0039] (2) Weigh 9.610 g of urea solid and 0.471 g of sodium citrate solid into the mixed salt solution in (1), and stir it with magnetic force to dissolve and stir evenly.

[0040] (3) Continue to stir the mixed solution obtained in (2) for 30 min with a magnetic stirrer, and measure the pH value of the mixed solution with a pH meter.

[0041] (4) Then the obtained mixed solution was sealed and placed in a polytetrafluoroethylene-lined stainless steel reactor, and hydrothermally treated in an oven at 120±2 °C for 12 h.

[0042] (5) After the reaction kettle is naturally cooled, filter the reacted solution to get the precipitate, wash it with deioni...

Embodiment 2

[0045] Example 2: c(Ni 2+ ):c(Mn 2+ ):c(Fe 3+ ) =2:1:1

[0046] (1) Weigh 8.142 g of nickel nitrate hexahydrate and 5.656 g of ferric nitrate nonahydrate, measure 3.3 mL of manganese nitrate solution (50%) and dissolve it in 40 mL of distilled water, and stir with a magnetic stirrer for 10 min to completely dissolve until the solution clarify.

[0047] (2) Weigh 0.919 g of urea solids and 0.089 g of sodium citrate solids into the mixed salt solution in (1), dissolve them with magnetic stirring and stir evenly.

[0048] (3) Continue to stir the mixed solution obtained in (2) for 30 min with a magnetic stirrer, and measure the pH value of the mixed solution with a pH meter.

[0049] (4) Then the obtained mixed solution was sealed and placed in a polytetrafluoroethylene-lined stainless steel reactor, and hydrothermally treated in an oven at 120±2 °C for 12 h.

[0050] (5) After the reaction kettle is naturally cooled, filter the reacted solution to get the precipitate, wash ...

Embodiment 3

[0053] Example 3: c(Ni 2+ ):c(Mn 2+ ):c(Fe 3+ ) =3:1:1

[0054] (1) Weigh 3.489 g of nickel nitrate hexahydrate and 1.616 g of ferric nitrate nonahydrate, measure 0.9 mL of manganese nitrate solution (50%) and dissolve in 40 mL of distilled water, and stir with a magnetic stirrer for 10 min to completely dissolve until the solution clarify.

[0055] (2) Weigh 0.092 g of urea solids and 0.005 g of sodium citrate solids into the mixed salt solution in (1), and stir them with magnetic force to dissolve and stir evenly.

[0056] (3) Continue to stir the mixed solution obtained in (2) for 30 min with a magnetic stirrer, and measure the pH value of the mixed solution with a pH meter.

[0057] (4) Then the obtained mixed solution was sealed and placed in a polytetrafluoroethylene-lined stainless steel reactor, and hydrothermally treated in an oven at 120±2 °C for 12 h.

[0058] (5) After the reaction kettle is naturally cooled, filter the reacted solution to get the precipitate,...

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Abstract

The invention discloses a preparation method and an application of a hydrotalcite-like NiMnFe low temperature denitration catalyst, and belongs to the field of preparation of gas purification denitration catalysts. The method comprises the following steps: a NiMnFe hydrotalcite-like precursor is prepared through solution preparation, uniform stirring, hydrothermal treatment, suction filtration, washing and drying steps by using a nickel nitrate and manganese nitrate hexahydrate solution (having a mass fraction of 50%), iron nitrate nonahydrate as a raw material, urea as a precipitant, sodium citrate as a complexing agent and deionized water as a solvent and a washing agent; and the NiMnFe hydrotalcite-like precursor is calcined at a certain temperature to obtain the NiMnFe composite oxidedenitration catalyst. The NiMnFe composite oxide catalyst prepared by the method has good catalytic activity (NOx conversion rate of 90% or above at 150-330 DEG C), high N2 selectivity, excellent H2Oresistance and excellent anti-SO2 poisoning performance when applied to a low-temperature NH3-SCR reaction.

Description

technical field [0001] The invention relates to a preparation method and application of a hydrotalcite-like NiMnFe low-temperature denitration catalyst, belonging to the field of gas purification and denitration catalyst preparation. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, which will cause great harm to human health and the ecological environment. With the enhancement of people's awareness of environmental protection and the increasingly stringent regulations and policies, the efficient removal and emission reduction of nitrogen oxides is imperative. Selective catalytic reduction of ammonia (NH 3 -SCR) is widely used as an effective flue gas denitrification technology. However, the working window temperature of the vanadium-titanium catalysts used in industry to exert excellent catalytic performance is relatively high and narrow (300-400°C), which cannot meet the low temperature and wide working conditions. Therefore, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/2062B01J23/002B01J23/8892B01J2523/00B01J2523/72B01J2523/842B01J2523/847
Inventor 吴旭邹春蕾侯本辉孟浩王若男
Owner TAIYUAN UNIV OF TECH
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