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Method for preparing compound metallic oxide catalyst for catalyzing the degradation of dioxin

A composite metal, catalytic degradation technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve high catalytic degradation activity, simple preparation method, and low cost Effect

Inactive Publication Date: 2010-06-16
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Bertinchamps et al. evaluated the catalytic activity and concluded that TiO 2 It is the best catalyst carrier for transition metal oxides to catalyze the removal of chlorinated aromatic hydrocarbons. Studies have shown that anatase TiO 2 As a carrier, load γ-Fe 2 o 3 , CaO active components catalysts have catalytic oxidation activity for the dioxin substitute compound monochlorophenol, but the active components studied are limited to γ-Fe 2 o 3 and CaO, there is no TiO 2 as a carrier, containing Ca 2 Fe 2 o 5 Preparation method of active catalyst for catalytic degradation of dioxin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 16.86 g Ca(NO 3 ) 2 4H 2 O, 5.06 g Fe(NO 3 ) 3 9H 2 O, 25 grams of TiO 2 , add 350mL deionized water and a magnetic rotor, and stir fully on a magnetic stirrer until the solute is completely dissolved. Accurately weigh 7.17g of NaOH with a balance and place it in a 500mL beaker, add 370mL of deionized water, and stir with a glass rod to completely dissolve it. Will contain Fe(NO 3 ) 3 , Ca(NO 3 ) 2 The beaker of the mixed solution was placed in a 50°C water bath, and the NaOH aqueous solution was poured into the burette for titration reaction, and the titration rate was controlled to be 180d / min until the titration was completed. The titrated mixed suspension was suction-filtered with a vacuum pump, washed with 200mL deionized water and 50mL ethanol in turn. Put the filter cake obtained after suction filtration on a watch glass, and dry it in an electric heating constant temperature blast drying oven: 120°C, 20h. The dried solid was ground into a powder ...

Embodiment 2

[0014] Add 18.20 g Ca(NO 3 ) 2 4H 2 O, 6.43 g Fe(NO 3 ) 3 9H 2 O, 20 grams of TiO 2 , add 350mL deionized water and a magnetic rotor, and stir fully on a magnetic stirrer until the solute is completely dissolved. Accurately weigh 7.17g of NaOH with a balance and place it in a 500mL beaker, add 370mL of deionized water, and stir with a glass rod to completely dissolve it. Will contain Fe(NO 3 ) 3 , Ca(NO 3 ) 2 The beaker of the mixed solution was placed in a 50°C water bath, and the NaOH aqueous solution was poured into the burette for titration reaction, and the titration rate was controlled to be 160d / min until the titration was completed. The titrated mixed suspension was suction-filtered with a vacuum pump, washed with 200mL deionized water and 50mL ethanol in turn. Put the filter cake obtained after suction filtration on a watch glass, and dry it in an electric heating constant temperature blast drying oven: 120°C, 20h. The dried solid was ground into a powder ...

Embodiment 3

[0016] Add 15.80 g Ca(NO 3 ) 2 4H 2 O, 4.90 g Fe(NO 3 ) 3 9H 2 O, 25 grams of TiO 2 , add 350mL deionized water and a magnetic rotor, and stir fully on a magnetic stirrer until the solute is completely dissolved. Accurately weigh 7.17g NaOH with a balance and place it in a 500mL beaker, add 370mL deionized water, and stir with a glass rod to completely dissolve it. Will contain Fe(NO 3 ) 3 , Ca(NO 3 ) 2 The beaker of the mixed solution was placed in a 40°C water bath, and the NaOH aqueous solution was poured into the burette for titration reaction, and the titration rate was controlled to be 170d / min until the titration was completed. The titrated mixed suspension was suction-filtered with a vacuum pump, washed with 200mL deionized water and 50mL ethanol in turn. Put the filter cake obtained after suction filtration on a watch glass, and dry it in an electric heating constant temperature blast drying oven: 120°C, 20h. The dried solid was ground into a powder in a m...

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PUM

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Abstract

The invention provides a method for preparing a compound metallic oxide catalyst for catalyzing the degradation of dioxin. The method comprises the following steps of: using NaOH or KOH as precipitant, under the condition of stirring sharply and water bath, dripping a solution containing Ca<2+>, Fe<3+> and TiO2, carrying out titration, performing pumping filtration, washing, drying and baking to obtain the compound metallic oxide catalyst. Through controlling the composition of the Ca<2+> and the Fe<3+> and the titration speed, the compound metallic oxide catalyst with an active component of Ca2Fe2O5 is obtained. The catalyst has advantages of low cost, easy preparation method and high catalytic degradation activity to dioxin pollutants.

Description

technical field [0001] The invention relates to a preparation method of a composite metal oxide catalyst for catalytically degrading dioxin. Background technique [0002] In recent years, the pollution of dioxins (Polychlorinated dibenzo-p-dioxins, Polychlorinated dibenzofurans, PCDD / Fs) caused by waste incineration has attracted widespread attention worldwide. Because dioxins are difficult to biodegrade and are quite stable to heat, strong acids, strong alkalis, and oxidants, they are typical persistent organic pollutants (Persistent Organic Pollutants, POPs), which are serious hazards to human health and the environment. The monitoring of waste incineration plants, the main source of dioxins, has been strengthened, and stricter emission standards have been formulated. At present, the research on the reduction technology and control principle of dioxin in waste incineration tail gas has become one of the hot spots in the field of environmental chemistry. [0003] The tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J21/06A62D3/38A62D101/28
Inventor 马小东宋琪孙红文王淑荣李然沈云超
Owner NANKAI UNIV
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