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Preparation method for high-efficiency Ce1-xMnxO2-delta solid solution low-temperature denitration catalyst and application thereof

A low-temperature denitration, solid solution technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Water resistance requirements and other issues, to achieve the effect of broad industrial application prospects, less pollution, and rich raw material resources

Inactive Publication Date: 2016-01-06
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of efficient, low-cost, environment-friendly Ce 1–x mn x o 2–δ The preparation method of solid solution catalyst and its application in low-temperature denitrification of flue gas in coal-fired power plants are used to solve the problems that catalysts in the prior art cannot meet the requirements of wide low-temperature window, high selectivity and excellent water resistance in the actual denitrification process

Method used

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  • Preparation method for high-efficiency Ce1-xMnxO2-delta solid solution low-temperature denitration catalyst and application thereof
  • Preparation method for high-efficiency Ce1-xMnxO2-delta solid solution low-temperature denitration catalyst and application thereof
  • Preparation method for high-efficiency Ce1-xMnxO2-delta solid solution low-temperature denitration catalyst and application thereof

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Effect test

Embodiment 1

[0036] 1. Preparation of MnO by mechanical mixing method x -CeO 2 Catalyst (abbreviated as MnCe-MMM catalyst)

[0037] Accurately weigh 8.9575g50%Mn(NO 3 ) 2 , placed in a ceramic crucible, and then put the ceramic crucible into the muffle furnace, under the flowing air atmosphere of 100mL / min, the temperature was raised from room temperature to 500 °C at a rate of 2 °C / min, and then naturally cooled to room temperature, then taken out, placed in agate Grinding in a mortar for 30 min to obtain MnO x ; Similarly, accurately weigh 25.3237gCe (NO 3 ) 3 ·6H 2 O, after grinding in an agate mortar for 30 min, place it in a ceramic crucible, then put the ceramic crucible into a muffle furnace, and raise the temperature from room temperature to 500 °C at a rate of 2 °C / min under 100 mL / min flowing air atmosphere, and then After naturally cooling to room temperature, take it out and grind it in an agate mortar for 30 minutes to obtain CeO 2 ; Finally, the above MnO x and CeO ...

Embodiment 2

[0054] Accurately weigh 0.2986g50%Mn(NO 3 ) 2 and 35.8149gCe(NO 3 ) 3 ·6H 2 O, ultrasonically dissolved in 150mL of distilled water, magnetically stirred at room temperature for 2h to mix evenly, and then added dropwise to excess (5000mL) NaOH (0.05mol / L) solution, Mn(NO 3 ) 2 , Ce(NO 3 ) 3 The pH of the suspension mixed with the NaOH solution is ≥ 10.0, magnetically stirred at room temperature for 3 hours to make the precipitation complete, and then continued to stir for 2 hours, and the suspension was transferred to multiple 250mL hydrothermal reaction kettles, and then the airtight The hydrothermal reaction kettle was placed in an oven at 100°C for 48 hours, followed by centrifugation and solid-liquid separation, and the obtained solid phase was washed until the pH of the washing liquid no longer changed, then dried overnight in an oven at 100°C, and then naturally cooled to room temperature and taken out. Grind in an agate mortar for 30 minutes, and finally, place i...

Embodiment 3

[0056] Accurately weigh 11.9433g50%Mn(NO 3 ) 2 and 21.7060gCe(NO 3 ) 3 ·6H 2 O, ultrasonically dissolved in 150mL of distilled water, stirred magnetically at room temperature for 2h to make it evenly mixed, then added dropwise to excess (500mL) NaOH (0.5mol / L) solution, Mn(NO 3 ) 2 , Ce(NO 3 ) 3 The pH of the suspension mixed with the NaOH solution is ≥ 10.0, magnetically stirred at room temperature for 3 hours to make the precipitation complete, and then continued to stir for 4 hours, and the suspension was transferred to multiple 250mL hydrothermal reaction kettles, and then the airtight The hydrothermal reaction kettle was placed in an oven at 180°C for 6 hours, followed by centrifugation and solid-liquid separation, and the obtained solid phase was washed until the pH of the washing liquid no longer changed, then dried overnight in an oven at 120°C, and then naturally cooled to room temperature and taken out. Grind in an agate mortar for 30 minutes, and finally, pla...

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Abstract

The invention provides a preparation method for a high-efficiency Ce1-xMnxO2-delta solid solution low-temperature denitration catalyst and an application thereof. The preparation method comprises the following steps: uniformly dissolving a certain amount of Mn(NO3)2 and Ce(NO3)3; slowly adding the mixture into a superfluous NaOH solution and completely depositing; transferring into a hydrothermal reaction kettle and performing high-temperature high-pressure reaction; and lastly, performing centrifuging and solid-liquid separation, and cleaning, drying and roasting the acquired solid phase matter, thereby acquiring the Ce1-xMnxO2-delta solid solution catalyst. The preparation method provided by the invention has the advantages that the prepared catalyst is excellent in denitration property and has high activity, high selectivity, wide operating temperature window and excellent water resistance; the required raw materials are rich in resources, cheap and easily acquired; the preparation process is simple and convenient; the energy consumption is low, the pollution is small and the environment is protected; and the catalyst is fit for mass production and has a wide industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of low-temperature denitrification catalysts for flue gas in coal-fired power plants, and in particular relates to a high-efficiency Ce 1–x mn x o 2–δ Preparation method and application of solid solution low-temperature denitrification catalyst. Background technique [0002] Nitrogen oxides (NO x ) can not only lead to the formation of acid rain and photochemical smog, but also PM 2.5 One of the main precursors of NO x The presence of these substances can cause serious harm to human health and plant growth. Coal-fired power plants are NO x It is imminent to denitrify its flue gas. Studies have shown that ammonia (NH 3 ) selective catalytic reduction of NO x (NH 3 -SCR) is the most effective technology for flue gas denitrification in coal-fired power plants. The key to this technology lies in the development of denitrification catalysts. At present, WO 3 or MoO 3 Modified V 2 o 5 / TiO 2 is wide...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/56B01D53/92
Inventor 姚小江杨复沫李红丽
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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