Perovskite type catalyst prepared by sol-gel weak oxidation calcination and method

A perovskite, sol-gel technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of catalyst performance degradation and difficult maintenance. , to achieve the effect of mild and easy control of reaction conditions, less damage to the environment and equipment, and easy control of reaction conditions

Pending Publication Date: 2020-12-11
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even hard to maintain ABO 3 The basic structural framework

Method used

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  • Perovskite type catalyst prepared by sol-gel weak oxidation calcination and method
  • Perovskite type catalyst prepared by sol-gel weak oxidation calcination and method

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Use lanthanum nitrate, strontium acetate hemihydrate, cobalt nitrate hexahydrate, manganese acetate tetrahydrate, EDTA, and citric acid as raw materials. The molar ratio of raw materials is 0.5:0.5:0.8:0.2:2:1. Adjust the pH of the solution to 6-7 with 0.3% ammonia water or urea to obtain a transparent sol, evaporate the water in a water bath to form a gel, and dry it at 250°C for 5 hours. The xerogel was calcined at 950°C for 5 hours under weak oxidation conditions, and ground into powder after cooling to obtain (La 0.5 Sr 0.5 )(Co 0.8 mn 0.2 )O 3-λ catalyst. The performance parameters of the prepared catalysts are listed in Table 1. figure 1 X-ray diffraction pattern of the prepared catalyst.

Embodiment 2

[0019] Use lanthanum nitrate, strontium acetate hemihydrate, cobalt nitrate hexahydrate, manganese acetate tetrahydrate, EDTA, and citric acid as raw materials. The molar ratio of raw materials is 0.5:0.5:0.8:0.2:2:1. Adjust the pH of the solution to 6-7 with 0.3% ammonia water or urea to obtain a transparent sol, evaporate the water in a water bath to form a gel, and dry it at 250°C for 5 hours. The xerogel was calcined at 900°C for 5 hours under weak oxidation, and after cooling, it was ground into powder to obtain (La 0.5 Sr 0.5 )(Co 0.8 mn 0.2 )O 3-λ catalyst. The performance parameters of the prepared catalysts are listed in Table 1.

Embodiment 3

[0021] Use lanthanum nitrate, strontium acetate hemihydrate, cobalt nitrate hexahydrate, manganese acetate tetrahydrate, EDTA, and citric acid as raw materials. The molar ratio of raw materials is 0.5:0.5:0.8:0.2:2:1. Adjust the pH of the solution to 6-7 with 0.3% ammonia water or urea to obtain a transparent sol, heat to evaporate water to form a gel, and then dry at 250°C. The xerogel was calcined at 1000°C for 5 hours under weak oxidation, and after cooling, it was ground into powder to obtain (La 0.5 Sr 0.5 )(Co 0.8 mn 0.2 )O 3-λ catalyst. The performance parameters of the prepared catalysts are listed in Table 1.

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Abstract

The invention discloses a perovskite type catalyst prepared by sol-gel weak oxidation calcination and a method. The method comprises the following steps of: dissolving lanthanum nitrate, strontium acetate hemihydrate, cobalt nitrate hexahydrate, manganese acetate tetrahydrate, a composite complexing agent ethylenediaminetetraacetic acid and citric acid with deionized water to prepare sol, and adjusting the pH value by using an adjusting agent in the sol forming process to make the pH value in a range of 6-7; evaporating sol moisture through heating or water bath to form gel, and drying the gelat 250 DEG C for 5 hours to obtain dry gel; and calcining the dry gel for 4-6 hours at 900-1000 DEG C under a weak oxidation condition, cooling, taking out, and grinding into powder, thereby obtaining the perovskite (La0.5Sr0.5) (Co0.8Mn0.2)O3-lambda oxide catalyst. The preparation process is simple, damage to equipment and the environment is small, and the prepared catalyst has excellent, stableand reliable catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a perovskite-type catalyst prepared by a sol-gel weak oxidation calcination method and a method thereof. Background technique [0002] The general chemical formula of perovskite oxide is ABO 3 , where the A site is generally occupied by rare earth or alkaline earth element ions, and the B site is mostly occupied by transition element ions. Both the A site and B site ions can be partially or completely replaced by doped metal ions with similar radii, but their crystal structure basically maintains unchanged, so it is an ideal sample for preparing catalysts and researching and developing their catalytic properties. In the perovskite crystal structure, the B-site cations form octahedral coordination with six oxygen ions, and the A cations have a 12-coordination structure and are located in the holes formed by octahedrons. Under the condition that the A-site ions rema...

Claims

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Application Information

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IPC IPC(8): B01J23/889
CPCB01J23/8892
Inventor 毛韦达赵林
Owner TIANJIN UNIV
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