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Vanadium based SCR catalyst as well as preparation and application thereof in tail gas NOx desorption after acrylonitrile oxidation

A technology of SCR catalyst and acrylonitrile, applied in chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve problems not involved in selective reduction of NOx, achieve effective removal of NOx, facilitate industrial production, and facilitate operation Effect

Inactive Publication Date: 2014-07-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the denitrification technology aimed at the control of acrylonitrile tail gas emission has just started in China. The current tail gas purification method is only aimed at the oxidation process of acrylonitrile tail gas (such as patents CN101716462A, CN101138699A and CN1903415A), and does not involve the NOx in the tail gas after acrylonitrile oxidation. Selective reduction under oxygen conditions, and there is no vanadium-based NH 3 -Patented technology of SCR catalyst applied in this field

Method used

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  • Vanadium based SCR catalyst as well as preparation and application thereof in tail gas NOx desorption after acrylonitrile oxidation
  • Vanadium based SCR catalyst as well as preparation and application thereof in tail gas NOx desorption after acrylonitrile oxidation
  • Vanadium based SCR catalyst as well as preparation and application thereof in tail gas NOx desorption after acrylonitrile oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 2.500g of oxalic acid in water, heat at 70°C, and stir magnetically. After dissolving, weigh 0.401g of vanadium pentoxide powder, dissolve it in oxalic acid solution, and stir for 1h until the vanadium pentoxide powder is completely dissolved. Vanadium oxalate solution. Weigh 10.00g titanium dioxide (commercially available), the carrier itself contains 8-10% WO 3 . Immerse in the vanadium oxalate solution, stir for 1 hour, then rotate evaporate to dryness at 70°C, dry in an oven at 100°C for 12 hours, and roast in air at 500°C for 3 hours to obtain vanadium-titanium powder. Take a small amount of deionized water, add cerium nitrate Ce(NO 3 ) 3 ·6H 2 Dissolve 2.4g of O, impregnate the calcined vanadium-titanium powder in it, stir for 1 hour, then dry it by rotary evaporation at 70°C, dry it in an oven at 100°C for 12 hours, and bake it in air at 500°C for 3 hours to obtain Example 1.

Embodiment 2

[0025] Dissolve 2.500g of oxalic acid in water, heat at 70°C, and stir magnetically. After dissolving, weigh 0.401g of vanadium pentoxide powder, dissolve it in oxalic acid solution, and stir for 1h until the vanadium pentoxide powder is completely dissolved. Vanadium oxalate solution. Weigh 10.00g of titanium dioxide, the carrier itself contains 8-10% WO 3. Immerse in vanadium oxalate solution, stir for 1 hour, then spin evaporate to dryness at 70°C, dry in an oven at 100°C for 14 hours, and roast in air at 500°C for 3 hours to obtain vanadium-titanium powder. Take a small amount of deionized water, add 0.412g of zirconia to dissolve, impregnate the roasted vanadium-titanium powder in it, stir for 1h, and then dry it by rotary evaporation at 70°C, then dry it in an oven at 100°C for 14 hours, and put it in the air at 500°C Calcined for 3h to obtain Example 2. Put 2mL of Catalyst 2 in a tubular reactor, and the atmosphere of acrylonitrile tail gas after simulated oxidation ...

Embodiment 3

[0027] Weigh 2.500g of oxalic acid and dissolve it in water, heat at 70°C, and stir magnetically. After dissolving, weigh 0.1g of vanadium pentoxide powder, dissolve it in oxalic acid solution, and stir for 1h until the vanadium pentoxide powder is completely dissolved. Vanadium oxalate solution. Weigh 10.00g of titanium dioxide, the carrier itself contains 8-10% WO 3 . Immerse in vanadium oxalate solution, stir for 1 hour, then spin evaporate to dryness at 70°C, dry in an oven at 100°C for 16 hours, and roast in air at 500°C for 3 hours to obtain vanadium-titanium powder. Take a small amount of deionized water, add cerium nitrate Ce(NO 3 ) 3 ·6H 2 O 2.4g and zirconia 1.03g were dissolved, the roasted vanadium-titanium powder was impregnated in it, stirred for 1h, and then evaporated to dryness at 70°C, then placed in an oven at 100°C for 16 hours, and roasted in air at 500°C for 3h to prepare Example 3 is obtained. Put 2mL of Catalyst 3 in a tubular reactor, and the atm...

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Abstract

The invention relates to a vanadium based SCR catalyst as well as preparation and application thereof in tail gas NOx desorption after acrylonitrile oxidation. According to the invention, TiO2 is taken as a carrier, 1 to 8 wt percent of V2O5 is taken as an active component, 8 to 10 percent of WO3 is taken as addition agent, transition metal or rare-earth metallic element is taken as modifying component addition agent, the transition metal is Mn or Zr, the rare-earth element is Ce, Er and Tb, the content of transition metal is 2 to 20 percent, and the content of rare-earth element is 5 to 15 percent. The preparation method is as follows: dissolving V205 into oxalic acid water solution, then adding metallic element addition agent soluble salting liquid, stirring uniformly, dipping anatase crystal form TiO2 powder into mixed solution for stirring for 0.5 to 2h, then drying, and baking in air. 8 to 10 percent of WO3 is contained in the carrier. The invention has the advantages that the preparation process is simple, the repeatability is excellent, the industrial production is facilitated, mass NOX gas in the tail gas agter acrylonitrile oxidation can be effectively removed, and excellent thermal stability and low temperaure activity are shown.

Description

technical field [0001] The present invention relates to the tail gas catalytic purification technology of an acrylonitrile device, in particular to a vanadium-based SCR catalyst and the preparation and application of removing NOx in the tail gas after the oxidation of acrylonitrile, specifically for the oxidation of acrylonitrile rich in nitrogen oxides (NOx ) Vanadium-based SCR catalyst for tail gas purification and a preparation method thereof. It aims at the high-efficiency selective catalytic reduction of NOx-containing tail gas after the oxidation treatment of the acrylonitrile absorption tower, and provides the preparation method of the vanadium-based selective catalytic reduction (SCR) catalyst in the selective catalytic reduction stage of ammonia, which can realize the oxidation of acrylonitrile in the tail gas Efficient catalytic removal of NOx under oxygen-enriched conditions. Background technique [0002] As an important chemical intermediate, acrylonitrile is wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/56B01D53/86
Inventor 沈美庆王军
Owner TIANJIN UNIV