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Method for green recycling and regeneration of Fe2O3/TiO2 photocatalyst from waste SCR catalyst

A technology of SCR catalyst and photocatalyst, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalyst, etc., can solve the problems of narrow spectral response range, high raw material cost, low photocatalytic efficiency, etc., and achieve excellent Photocatalytic performance and the effect of improving leaching efficiency

Pending Publication Date: 2018-01-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, TiO 2 There are still some problems in the actual use of nanomaterials: (1) TiO 2 Nanomaterials are mostly pure chemical reagents, such as TiCl 4 、TiOSO 4 , titanium isopropoxide and tetrabutyl titanate, etc., these synthesis methods are difficult to be used in industrial production in large quantities due to the high cost of raw materials; (2) TiO 2 Due to the high recombination rate of photogenerated carriers, wide band gap, and narrow spectral response range, photocatalysts have low photocatalytic efficiency.

Method used

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  • Method for green recycling and regeneration of Fe2O3/TiO2 photocatalyst from waste SCR catalyst
  • Method for green recycling and regeneration of Fe2O3/TiO2 photocatalyst from waste SCR catalyst
  • Method for green recycling and regeneration of Fe2O3/TiO2 photocatalyst from waste SCR catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Pretreatment: Ball milling of spent SCR catalyst to a particle size of 200 mesh;

[0019] 2)NaOH-H 2 O alkali fusion decomposition: the waste SCR catalyst obtained in step 1) is mixed and stirred evenly with NaOH solution, and the mass ratio of NaOH: waste SCR catalyst is 1.0; the resulting mixed slurry is put into a nickel crucible for high-temperature reaction treatment, and the reaction is completed After that, the alkali fusion reaction product is taken out. The reaction temperature was controlled to be 350°C, and the reaction time was controlled to be 5 minutes. The mass concentration of the NaOH solution is 60%; after alkali fusion decomposition treatment, the conversion efficiency of titanium is 80.5%;

[0020] 3) Water immersion treatment: add the alkali fusion reaction product obtained in step 2) into water and stir; the solid-to-liquid ratio is 10g / L, the stirring temperature is 55°C, and the stirring time is 1h; after the stirring is completed, filter to...

Embodiment 2

[0023] 1) Pretreatment: Ball milling of spent SCR catalyst to a particle size of 200 mesh;

[0024] 2)NaOH-H 2 O alkali fusion decomposition: the waste SCR catalyst obtained in step 1) is mixed and stirred evenly with NaOH solution, and the mass ratio of NaOH: waste SCR catalyst is 1.8:1; the resulting mixed slurry is put into a nickel crucible for high-temperature reaction treatment, and After the reaction was finished, the alkali fusion reaction product was taken out. The reaction temperature is controlled to be 450° C., and the reaction time is controlled to be 10 min. The mass concentration of the NaOH solution is 80%; after alkali fusion decomposition treatment, the conversion efficiency of titanium is 98.2%;

[0025]3) Water immersion treatment: Add the alkali fusion reaction product obtained in step 2) into water and stir; the solid-to-liquid ratio is 10g / L, the stirring temperature is 55°C, and the stirring time is 2h; after the stirring is completed, filter to obtai...

Embodiment 3

[0028] 1) Pretreatment: ball mill the spent SCR catalyst, with a particle size of 300 mesh;

[0029] 2)NaOH-H 2 O alkali fusion decomposition: the waste SCR catalyst obtained in step 1) is mixed and stirred evenly with NaOH solution, and the mass ratio of NaOH: waste SCR catalyst is 2.0:1; the resulting mixed slurry is put into a nickel crucible for high-temperature reaction treatment, and After the reaction was finished, the alkali fusion reaction product was taken out. The reaction temperature was controlled to be 550°C, and the reaction time was controlled to be 15 minutes. The mass concentration of the NaOH solution is 70%; after alkali fusion decomposition treatment, the conversion efficiency of titanium is 99.5%;

[0030] 3) Water immersion treatment: add the alkali fusion reaction product obtained in step 2) into water and stir; the solid-to-liquid ratio is 10g / L, the stirring temperature is 55°C, and the stirring time is 1.5h; after the stirring is completed, filter ...

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Abstract

The invention provides a method for green recycling and regeneration of a Fe2O3 / TiO2 photocatalyst from a waste SCR catalyst, belonging to the technical field of resourceful utilization of solid hazardous wastes. The method comprises the following steps: (1) pretreating the waste SCR catalyst; (2) carrying out NaOH-H2O high-temperature alkali fusion activation so as to obtain metastable alpha-Na2TiO3; (3) carrying out water soaking treatment so as to obtain alpha-Na2TiO3 enriched slag; (4) carrying out acid leaching treatment, dissolving the alpha-Na2TiO3 enriched slag, and carrying out filtering so as to further purify a titanium containing solution; and (5) carrying out hydrothermal regeneration. According to the invention, a green and clean recycling processing method for a titanium component in the waste SCR catalyst is constructed; meanwhile, a nanometer TiO2 product is prepared by utilizing a great amount of TiO2 components contained in the waste SCR catalyst; thus, elements witha valence in the waste SCR catalyst can be avoided from resource waste and secondary environmental pollution; an industrial chain for cyclic utilization of the waste SCR catalyst can be formed; and the preparation cost for a TiO2 nanometer material is significantly reduced.

Description

technical field [0001] The invention belongs to the technical field of solid hazardous waste recycling, in particular to the green recovery and regeneration of Fe from waste SCR catalysts 2 o 3 / TiO 2 photocatalytic method. Background technique [0002] In recent years, the rapid increase of flue gas denitrification devices in coal-fired power plants has led to explosive growth in market demand and online operation of denitrification catalysts (SCR catalysts). According to statistics from the China Electricity Council, thermal power units operating denitrification devices will reach 700 million kilowatts, and 550,000 to 600,000 cubic meters of SCR catalysts will be running online; 1 billion kilowatts of thermal power installed capacity will be installed with denitrification devices, and 800,000 to 900,000 cubic meters will be installed. The SCR catalyst is running online. Because the service life of SCR catalysts is generally 3 years, according to the operation and repla...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J37/08B01J37/10
CPCY02P10/20
Inventor 章启军吴玉锋李彬左铁镛
Owner BEIJING UNIV OF TECH
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