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SCR (selective catalyctic reduction) low-temperature denitrification catalyst with nano core-shell structure and preparation method thereof

A nano-core-shell, low-temperature denitrification technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of ensuring the uniformity of active nanoparticles and the surface composition of activated carbon And problems such as complex structure, easy aggregation of active components, etc., to achieve the effects of easy operation, strong anti-toxicity, and simple preparation

Active Publication Date: 2012-02-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently MnO x / CeO 2 Most of the active components are loaded on the carrier by impregnation method, MnO x –CeO 2 Particles are easy to agglomerate, and it is difficult to ensure that these active nanoparticles are evenly loaded on the surface of the carrier
[0005] Chinese patent CN101011659 uses activated carbon fiber as a carrier, and uses an impregnation method to load manganese and cerium oxides on activated carbon. The active components are easy to agglomerate, and the surface composition and structure of activated carbon are complex, and it is easy to ablate during the NO reduction process.

Method used

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  • SCR (selective catalyctic reduction) low-temperature denitrification catalyst with nano core-shell structure and preparation method thereof
  • SCR (selective catalyctic reduction) low-temperature denitrification catalyst with nano core-shell structure and preparation method thereof
  • SCR (selective catalyctic reduction) low-temperature denitrification catalyst with nano core-shell structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Dissolve the nitrate of manganese and cerium in pyridine, disperse the multi-walled carbon nanotubes in the pyridine solution, and transfer it to a 100ml hydrothermal kettle after ultrasonication for 0.5h. o Solvothermal reaction in C for 24h, cooled to room temperature, centrifuged and washed to neutral, at 60 o C drying. Under the protection of nitrogen atmosphere, with 2 o C / min heating rate to 550 o C calcined for 5h, cooled to room temperature with the furnace temperature to obtain the MnO with nano-core-shell structure x / CeO 2 CNTs catalyst, the mass fraction of CNTs is 28%; its active component is: MnO X and CeO 2 , where MnOX for MnO 2 , Mn 3 o 4 , Mn 2 o 3 mixture, the molar ratio of Mn / (Mn+Ce) elements is 0.2.

[0025] Catalyst evaluation: Grind and sieve the prepared catalyst, take 20-60 mesh particles, put them into a fixed-bed quartz tube reactor for activity and selectivity testing, the reaction temperature is 50-450°C, and the space velocity i...

Embodiment 2

[0027] Dissolve the acetate of manganese and cerium in pyridine, disperse the single-walled carbon nanotubes in the pyridine solution, and transfer it to a 200ml hydrothermal kettle after ultrasonication for 1h. o Solvothermal reaction in C for 48h, cooled to room temperature, centrifuged and washed to neutral, at 60 o C drying. Under the protection of nitrogen atmosphere, with 6 o C / min heating rate to 500 o C calcined for 6h, cooled to room temperature with the furnace temperature to obtain the MnO with nano-core-shell structure x / CeO 2 CNTs catalyst, the mass fraction of CNTs is 55%, and its active component is: MnO X and CeO 2 , where MnO X for MnO 2 , Mn 3 o 4 , Mn 2 o 3 mixture, the molar ratio of Mn / (Mn+Ce) elements is 0.4.

[0028] Catalyst evaluation: Grind and sieve the prepared catalyst, take 20-60 mesh particles, put them into a fixed-bed quartz tube reactor for activity and selectivity testing, the reaction temperature is 50-500°C, and the space veloc...

Embodiment 3

[0030] Dissolve the chloride salt of manganese and cerium in pyridine, disperse the multi-walled carbon nanotubes in the pyridine solution, and transfer it to a 100ml hydrothermal kettle after ultrasonication for 0.5h. o Solvothermal reaction in C for 48h, cooled to room temperature, centrifuged and washed to neutral, at 60 o C drying. Under the protection of nitrogen atmosphere, with 4 o C / min heating rate to 600 o C calcined for 4.5h, and cooled to room temperature with the furnace temperature to obtain the MnO with the nano-core-shell structure x / CeO 2 CNTs catalyst, the mass fraction of CNTs is 40%, and its active component is: MnO X and CeO 2 , where MnO X for MnO 2 , Mn 3 o 4 , Mn 2 o 3 mixture, the molar ratio of Mn / (Mn+Ce) elements is 0.2.

[0031] Catalyst evaluation: Grind and sieve the prepared catalyst, take 20-60 mesh particles, put them into a fixed-bed quartz tube reactor for activity and selectivity testing, the reaction temperature is 50-500°C, an...

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Abstract

The invention relates to a SCR (selective catalyctic reduction) low-temperature denitrification catalyst with nano core-shell structure and a preparation method thereof, belonging to the field of environment-friendly catalytic materials. Different from the traditional impregnation method, the method provided by the invention is implemented by carrying out a one-step chemical solvent thermal method on carbon nanotubes (CNTs), manganese salt and cerium salt to obtain the MnOx / CeO2@CNTs nano core-shell structure with high dispersity and high surface area of active components. The catalyst comprises a carrier CeO2@CNTs core-shell composite nano structure, and active components MnO2 and CeO2, wherein the CeO2 is used both as a carrier for further enriching the valence state of MnOx and enhancing the sulfur resistance of MnOx, and as an active component for reinforcing the conversion from NO to NO2 and enhancing the denitrification catalytic activity. The catalyst provided in the invention has excellent oxynitride removal efficiency and high N2 selectivity in fume at 120-250 DEG C. The catalyst provided by the invention can be used for SCR removal of ammonia in oxynitrides in fume discharged by coal-fired power plants, refuse incinerators, boilers and the like.

Description

technical field [0001] The invention relates to an environment-friendly catalyst, in particular to a low-temperature selective catalytic reduction denitrification catalyst for nitrogen oxides in flue gas and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) from coal-fired power plants and boiler combustion flue gas x ) is one of the main pollutants that cause acid rain, photochemical smog, etc. to destroy the ecological environment and damage human health, and cause great pollution to the atmosphere. How to effectively eliminate NO x (Denitrification) has become the focus and difficulty of air pollution control. NO in flue gas emissions x Among them, the NO content accounts for more than 90%, so the reduction and conversion of NO is the key to flue gas denitrification. Selective catalytic reduction of ammonia (NH 3 -SCR) is currently the most widely used mainstream flue gas denitrification technology in the world. Under the action of ca...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/02B01D53/86B01D53/56
Inventor 施利毅张登松颜婷婷钱一磊高瑞华李红蕊
Owner SHANGHAI UNIV
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