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Double-perovskite composite metal oxide catalyst and preparation method and application thereof

A composite metal and double perovskite technology, applied in the field of air pollution control, can solve the problems of catalyst sintering and deactivation, and achieve the effect of simple synthesis method, low price and good industrial application prospect

Active Publication Date: 2017-03-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The flue gas temperature in industrial production such as metallurgy, chemical industry, and building materials is higher than 300°C (the operating temperature of industrial regenerative catalytic combustion (RCO) often exceeds 500°C), and conventional precious metal catalysts or transition metal oxide catalysts are used for a long time Operation at high temperature can easily lead to catalyst sintering and deactivation

Method used

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  • Double-perovskite composite metal oxide catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] First, weigh lanthanum nitrate, copper acetate, and nickel nitrate as precursors at a molar ratio of 2:1:1, dissolve them in 10 mL of deionized water at room temperature, and stir the solution to a clear state; ratio) = 1.5, add citric acid to the above solution, stir the solution to a clear state; then, place the resulting solution in a water bath at 70°C, and magnetically stir until the solution is in a gel state; then, bake the gel at 100°C Dry for 24 hours; finally, the obtained solid is calcined at 500°C for 4h, at 1100°C for 4h, and then lowered to room temperature. The obtained catalyst is denoted as La 2 CuNiO 6 .

[0028] The catalytic reaction is carried out in a fixed bed, and 0.5g of La 2 CuNiO 6 , with 1,2-dichloroethane (DCE) as the probe gas, the concentration of the reactant is controlled at 400ppm, and the reaction space velocity is 24000h -1 , the oxygen concentration was 20%, the reaction was maintained at each temperature point for 40 min, and th...

Embodiment 2

[0030] First, weigh lanthanum nitrate, cerium nitrate, iron nitrate and cobalt nitrate as precursors at a molar ratio of 1:1:1:1, dissolve them in 10 mL of deionized water at room temperature, and stir the solution until it is clear; then, according to citric acid: total The number of metal ions (molar ratio) = 1.5, citric acid was added to the above solution, and the solution was stirred to a clear state; after that, the resulting solution was placed in a water bath at 70°C, and magnetically stirred until the solution was in a gel state; then, the gel Dry at 100°C for 24h; finally, roast the obtained solid at 500°C for 4h, then at 1100°C for 4h, and drop to room temperature. The obtained catalyst is recorded as LaCeFeCoO6 ;

[0031] The catalytic reaction is carried out in a fixed bed, take 0.5g of LaCeFeCoO 6 , also using DCE as the probe gas, the reaction conditions are the same as in Example 1, and the experimental results show that at 200°C, 250°C, 300°C, 350°C, 400°C, 45...

Embodiment 3

[0033] First, weigh lanthanum nitrate, strontium nitrate, manganese acetate, and cobalt nitrate as precursors at a molar ratio of 1:1:1:1, dissolve them in 10 mL of deionized water at room temperature, and stir the solution to a clear state; then, according to citric acid: total The number of metal ions (molar ratio) = 1.5, citric acid was added to the above solution, and the solution was stirred to a clear state; after that, the resulting solution was placed in a water bath at 70°C, and magnetically stirred until the solution was in a gel state; then, the gel Dry at 100°C for 24h; finally, roast the obtained solid at 550°C for 4h, then at 1100°C for 4h, and lower it to room temperature. The obtained catalyst is recorded as LaSrMnCoO 6 ;

[0034] The catalytic reaction is carried out in a fixed bed, take 0.5g of LaSrMnCoO 6 , also using DCE as the probe gas, the reaction conditions are the same as in Example 1, and the experimental results show that at 200°C, 250°C, 300°C, 35...

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Abstract

The invention discloses a double-perovskite composite metal oxide catalyst and a preparation method and application thereof and belongs to the technical field of atmospheric pollution treatment. The condensed structural formula of the double-perovskite composite metal oxide catalyst is A2B2O6, wherein A is La, Sr or Ce, and B is Mn, Fe, Co, Cu or Ni. The double-perovskite composite metal oxide catalyst has the advantages that the catalyst is excellent in high temperature resistance, water resistance and chlorine resistance and applicable to effective degradation of CVOCs under an industrial high-temperature environment; the catalyst can achieve complete oxidization of industrial typical CVOCs (1,2-dichloroethane) under reaction temperature of 500-550 DEG C, reaction air speed of 20000-30000h<-1> and oxygen concentration of 10-20%; meanwhile, by regulating the loading capacity of transition metal oxide, the oxidizing efficiency of the catalyst can be increased effectively, and the selectivity of the reaction product CO2 can be increased greatly. The preparation method of the catalyst is simple, cheap in raw material and promising in industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a double perovskite type composite metal oxide catalyst and a preparation method and application thereof. Background technique [0002] Volatile organic compounds (VOCs) refer to the general term for non-methane organic compounds that are volatile at normal temperature and pressure, with a saturated vapor pressure exceeding 70 Pa or a boiling point between 50 and 260 °C. Among them, chlorine-containing volatile organic pollutants (CVOCs) are the most common type of VOCs, mainly including chlorobenzene, methylene chloride, carbon tetrachloride, dichloroethane, trichloroethane, etc. 1,2-Dichloroethane (DCE), is a colorless liquid with a chloroform smell, slightly soluble in water. It is an important chemical raw material and an intermediate in the production of vinyl chloride, 1,1,1-trichloroethane, trichloroethylene and tetrachloroethylene; it is also us...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/889B01D53/86B01D53/70
CPCB01D53/8662B01J23/002B01J23/83B01J23/8892B01D2257/2064B01J2523/00B01J2523/24B01J2523/3706B01J2523/72B01J2523/845B01J2523/23B01J2523/842B01J2523/17
Inventor 何炽徐碧涛潘华郑春莉刘萍萍
Owner XI AN JIAOTONG UNIV
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