Three-dimensional ordered macroporous perovskite type composite metal oxide catalyst and preparation method and application thereof

A three-dimensional ordered, perovskite-type technology, applied in the field of air pollution control, can solve problems such as restricted development and biological toxicity, and achieve excellent stability

Inactive Publication Date: 2017-07-21
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adsorption absorption method is mainly an effective technology for the physical treatment of CVOCs waste gas by adsorption and absorption technology, but it cannot fundamentally solve the problem
Since CVOCs themselves have certain toxicity, their toxic effects on organisms limit their industrial development.

Method used

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  • Three-dimensional ordered macroporous perovskite type composite metal oxide catalyst and preparation method and application thereof
  • Three-dimensional ordered macroporous perovskite type composite metal oxide catalyst and preparation method and application thereof
  • Three-dimensional ordered macroporous perovskite type composite metal oxide catalyst and preparation method and application thereof

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preparation example Construction

[0037] The present invention is a three-dimensional ordered macroporous perovskite composite metal oxide suitable for industrial chlorine-containing volatile organic compounds (CVOCs), a) it is a three-dimensional ordered macroporous structure in appearance; b) calcium The simplified formula of titanium ore composite metal oxide catalyst is ABO 3 , where the A position is an alkaline earth or rare earth metal (La, Sr), and the B position is a transition metal element (Fe, Co); c) supporting a transition metal oxide Co on the surface of the catalyst 3 o 4 Optimal modification is carried out, and the loading amount of transition metal oxide is 5-16wt% (wt% is the mass fraction, the same below). d) The perovskite-type metal composite oxide has a stable structure, and has excellent oxidation and chlorine resistance to chlorine-containing volatile organic pollutants. The specific steps of the preparation method are as follows:

[0038] 1) Preparation of PMMA template;

[0039] ...

Embodiment 1

[0055] Add 650mL deionized water into the three-neck flask, 2 Under the atmosphere, stir in a water bath at 70°C until the water is free of oxygen, then add 65mL of methyl methacrylate (MMA) containing 0.03wt% p-hydroxybenzoic acid, continue the reaction for 15min, and add 20mL of potassium persulfate solution with a concentration of 0.01g / mL , The reaction is about 45min. After the reaction was completed, pour it into 1800 mL deionized water and mix evenly. The resulting solution was placed in a constant temperature water bath at 70° C. for 8 hours to obtain a PMMA solid hard template.

[0056] Weigh 0.01mol of lanthanum nitrate, strontium acetate, iron nitrate and cobalt nitrate as precursors, dissolve in 7mL of ethylene glycol at room temperature, stir the solution to a clear state, add 1.5g of P123 dissolved in anhydrous methanol to the resulting solution, Stir for 1h. Add 2g PMMA to impregnate for 6h, vacuum filter and dry at room temperature. The obtained sample is in...

Embodiment 2

[0058] The preparation of PMMA template is with embodiment 1;

[0059] Weigh 0.01mol of lanthanum nitrate, strontium acetate, iron nitrate and 0.012mol of cobalt nitrate as precursors, dissolve in 7mL of ethylene glycol at room temperature, stir the solution to a clear state, add 1.5g of P123 dissolved in anhydrous methanol to the resulting solution In, stir for 1h. Add 2g PMMA to impregnate for 6h, vacuum filter and dry at room temperature. The obtained sample is in N 2 conditions, 350 ° C for 3 h; then under air conditions, 650 ° C for 4 h to obtain a three-dimensional ordered macroporous perovskite-type composite metal oxide catalyst (5wt% Co 3 o 4 / 3DOMLa 0.5 Sr 0.5 f e0.5 co 0.5 o 3 ). see figure 2 , image 3 Among them, b is its XRD spectrum and activity assay curve, respectively.

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Abstract

The invention discloses a three-dimensional ordered macroporous perovskite type composite metal oxide catalyst and a preparation method and application thereof. The catalyst is excellent in high temperature resistance and chlorine resistance, capable of realizing complete oxidation of industrial typical CVOCs (1,2dichloroethane) under conditions that the reaction temperature is 450-500 DEG C, the reaction air speed is 40000-50000mL.h<-1>.g<-1> and the oxygen concentration is 10-40% and can be used for effective degradation of industrial CVOCs. In addition, by loading of transition metal oxides, catalytic oxidation efficiency of the catalyst can be improved effectively; oxidation performance and thermal stability of the catalyst can be improved effectively by modification through cheap transition metal oxides (such as Co3O4), and activity and selectivity of the catalyst have no dramatic decline after continuous reaction for 800min. A synthesis method of the catalyst is simple, and the three-dimensional ordered macroporous perovskite type composite metal oxide catalyst has a promising industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and relates to a three-dimensional ordered macroporous perovskite-type composite metal oxide catalyst and a preparation method and application thereof. Background technique [0002] In recent years, the problems of air environmental quality have emerged continuously, making volatile organic compounds (VOCs) the top priority of air pollution prevention and control. The so-called volatile organic pollutants refer to the general term of non-methane organic compounds that are volatile at normal temperature and pressure, and whose saturated vapor pressure exceeds 70Pa at room temperature or whose boiling point is between 50-260°C. Among them, chlorinated volatile organic pollutants (CVOCs) have attracted more attention than other volatile pollutants because of their more serious impact on the human body and the environment. There are 12 persistent pollutants listed as the first in the in...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/10B01D53/86B01D53/70
CPCB01D53/8662B01J23/002B01J23/83B01D2257/708B01J2523/00B01J35/60B01J2523/24B01J2523/3706B01J2523/842B01J2523/845
Inventor 何炽田明姣于艳科郑春莉潘华
Owner XI AN JIAOTONG UNIV
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