Novel catalyst for dioxin degradation and preparation method thereof

A catalyst and catalyst carrier technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., to achieve the effect of small particle size, simple preparation method, and rich surface acidity

Pending Publication Date: 2021-04-02
江苏百茂源环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the biggest problem facing catalytic oxidation to eliminate dioxins is the preparation and production of high-performance catalysts.

Method used

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  • Novel catalyst for dioxin degradation and preparation method thereof
  • Novel catalyst for dioxin degradation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) at first 6.1g ammonium metavanadate is dissolved in 150mL concentration and is 13% in the oxalic acid solution, stirs to make it dissolve completely;

[0025] (2) Add 4.0g of ammonium paratungstate to the above oxalic acid solution, then fully stir at 40°C to dissolve it;

[0026] (3) Continue to add 1.2 g of ferric sulfate in the above oxalic acid solution, fully stir to dissolve it at 40°C;

[0027] (4) In the oxalic acid solution containing vanadium, tungsten and iron precursors, add 79g TiO 2 and 10g SiO 2 , keep the above temperature and continue to stir for 5 hours to carry out the aging of the catalyst;

[0028] (5) After the aging is completed, the TiO loaded with the active component precursor 2 and SiO 2 The mixture was dried in a blast drying oven for 12 hours at a drying temperature of 80°C;

[0029] (6) The dried catalyst precursor was calcined in a muffle furnace at 400° C. for 5 hours. After the calcination, a dioxin-degraded catalyst was obtaine...

Embodiment 2

[0031] (1) First, 8.5 g of vanadyl oxalate was dissolved in 120 mL of 18% oxalic acid solution, and stirred to completely dissolve it;

[0032] (2) Add 5.0g of ammonium metatungstate to the above oxalic acid solution, then fully stir at 60°C to dissolve it;

[0033] (3) Continue to add 3.5 g of ferric sulfate in the above oxalic acid solution, fully stir it to dissolve it at 60° C.;

[0034] (4) In the oxalic acid solution containing vanadium, tungsten and iron precursors, add 65g TiO 2 and 18.5g SiO 2 , keep the above temperature and continue to stir for 7 hours to carry out the aging of the catalyst;

[0035] (5) After the aging is completed, the TiO loaded with the active component precursor 2 and SiO 2 The mixture was dried in a blast drying oven for 20 hours at a drying temperature of 100°C;

[0036] (6) The dried catalyst precursor was calcined in a muffle furnace at 500° C. for 8 hours. After the calcination, a dioxin-degraded catalyst was obtained. The test result...

Embodiment 3

[0038] (1) at first 4.3g vanadyl sulfate is dissolved in 140mL concentration and is 20% oxalic acid solution, stirs to make it dissolve completely;

[0039] (2) Add 8.0g of ammonium metatungstate to the above oxalic acid solution, then fully stir at 70°C to dissolve it;

[0040] (3) Continue to add 2.3 g of ferric nitrate to the above oxalic acid solution, and fully stir it at 70° C. to dissolve it;

[0041] (4) In the oxalic acid solution containing vanadium, tungsten and iron precursors, add 70g TiO 2 and 22g SiO 2 , keep the above temperature and continue to stir for 10 hours to carry out the aging of the catalyst;

[0042] (5) After the aging is completed, the TiO loaded with the active component precursor 2 and SiO 2 The mixture was dried in a blast drying oven for 15 hours at a drying temperature of 120°C;

[0043] (6) The dried catalyst precursor was calcined in a muffle furnace at 550° C. for 10 hours. After the calcination, a dioxin-degraded catalyst was obtained...

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Abstract

The invention provides a novel catalyst with high activity and high stability and a preparation method thereof. The novel catalyst is used for catalytic oxidative degradation of waste incineration dioxin. The catalyst mainly comprises an active component and a carrier. The active component is composed of 0.5-10% by mass of transition metal oxides V2O5, 0.1-8% by mass of WO3 and 0.1-6% by mass of Fe2O3; and the catalyst carrier is composed of 50-95% by mass of TiO2 and 5-20% by mass of SiO2. The catalyst does not contain noble metal, is low in preparation cost, simple in preparation method andlow in activation temperature, and has relatively high elimination efficiency on dioxin pollutants, the elimination rate of the catalyst at 180 DEG C is close to 70%, and the elimination efficiency ofthe catalyst at 220 DEG C exceeds 90%.

Description

technical field [0001] The invention belongs to the key technology research field of catalyst preparation, and relates to a catalyst for catalytic oxidation degradation of dioxin pollutants in waste incineration flue gas and a preparation method thereof. Background technique [0002] Dioxin is a chlorinated oxygen-containing tricyclic aromatic hydrocarbon compound, which has the characteristics of stable chemical properties, good thermal stability, and is not easy to be biodegraded. It will accumulate in organisms and the environment for a long time, and has "carcinogenic" effects on organisms. , "teratogenic" and "mutagenic" effects. [0003] At present, most waste incineration dioxins are treated with activated carbon adsorption technology, but activated carbon adsorption technology has the disadvantages of high operating costs and incomplete treatment of low-concentration dioxins, and the concentration of dioxins in the treated flue gas mostly exceeds the national standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/70B01D53/72B01D53/86
CPCB01J23/888B01J23/002B01J35/0066B01D53/8662B01D53/8668B01J2523/00B01D2257/2064B01D2257/70B01D2258/0291B01J2523/41B01J2523/47B01J2523/55B01J2523/69B01J2523/842
Inventor 唐志诚赵海军吴军伟
Owner 江苏百茂源环保科技有限公司
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