Modified perovskite type catalyst and preparation method thereof

A perovskite-type catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of low-temperature catalytic activity and limitations of perovskite-type catalysts, and achieve The effect of low operating cost, ease of industrial application, and increased catalytic activity

Pending Publication Date: 2019-07-19
江苏中创清源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the catalytic treatment of VOCs, it still has the problem of lower catalytic activity at low temperature compared with noble metals.
Therefore, perovskite-based catalysts are limited in industrial applications

Method used

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  • Modified perovskite type catalyst and preparation method thereof
  • Modified perovskite type catalyst and preparation method thereof

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preparation example Construction

[0025] A kind of preparation method of modified perovskite type catalyst is characterized in that, comprises the following steps:

[0026] (1) Mix the metal salt of A and the metal salt of M according to the molar ratio of A and B in the ratio of 1:0.8 to 1:1.2, load them on the carrier according to the sol-gel method, dry and roast, and prepare ABO 3 Perovskite materials;

[0027] (2) immersing the perovskite catalytic material prepared in step (1) in an acidic solution;

[0028] (3) The material obtained in step (2) is washed with distilled water or deionized water, and when the pH is neutral, it is placed in an oven for drying, and the obtained material is a modified perovskite catalyst.

Embodiment 1

[0030] A modified perovskite catalyst, the modified perovskite catalyst is ABO 3 structure, where A is La 1-x m x , x=0, B bit is Mn.

[0031] A preparation method of a modified perovskite catalyst, comprising the following steps:

[0032] (1) Preparation of LaMnO supported on cordierite by sol-gel method 3 Perovskite. Take La(NO 3 ) 2 .6H 2 O11.5g, the weight fraction is 50% Mn(NO 3 ) 2 9.5g, citric acid 1.7g, add 7g of deionized water. Cook it in a water bath at 60°C to make it appear as a sol, then place the cordierite carrier in the sol, take it out and dry it, dry it at 105°C for 6 hours, and then bake it at 700°C for 4 hours. then prepared LaMnO 3 perovskite materials.

[0033] (2) LaMnO prepared in step (1) 3 Perovskite soaked in 3M HNO 3 solution, the duration is 20min.

[0034] (3) Rinse the modified material obtained in step (2) with distilled water or deionized water. When the pH is neutral, then place the material in an oven and dry it at 130°C for ...

Embodiment 2

[0038] A modified perovskite catalyst, the modified perovskite catalyst is ABO 3 structure, where A is La 1-x m x , x=0, B bit is Co.

[0039] A preparation method of a modified perovskite catalyst, comprising the following steps:

[0040] (1) Preparation of LaCoO supported on alumina by sol-gel method 3 Perovskite. Take La(NO 3 ) 2 .6H 2 O11.5g, Co(NO 3 ) 2 .6H 2 O 7.7g, citric acid 1.7g, add deionized water 7g. Cook in a water bath at 60°C to make it appear as a sol, then place the alumina carrier in the sol, take it out and dry it, dry it at 120°C for 10 hours, and then bake it at 500°C for 6 hours. then prepare LaCoO 3 perovskite materials.

[0041](2) LaCoO prepared in step (1) 3 The perovskite was soaked in 3M glacial acetic acid solution for 80min.

[0042] (3) Rinse the modified material obtained in step (2) with distilled water or deionized water. When the pH is neutral, then place the material in an oven and dry it at 60°C for 5 hours. The obtained mat...

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Abstract

The invention discloses a modified perovskite type catalyst, which is an ABO3 structure, wherein A is La1-xMx, x is 0 or 0.5, M is one selected from Sr, Ce, Ba and Ca, and B is one or two selected from Mn, Co, Cr, Fe and Ni. The preparation method comprises: 1, mixing the metal salt of A and the metal salt of M according to a molar ratio of A to B of 1:0.8-1:1.2, loading the obtained mixture ontoa carrier according to a sol-gel method, drying, and calcining to prepare an ABO3 perovskite type material; 2, immersing the perovskite catalytic material prepared in the step 1 in an acidic solution;and 3, washing the material obtained in the step 2 with distilled water or deionized water, placing in an oven after the pH value is neutral, and drying to obtain the modified perovskite catalyst. According to the present invention, the prepared modified perovskite type catalyst has the significantly increased catalytic activity compared with the original perovskite type catalyst, and retains theexcellent high-temperature resistance of the perovskite material.

Description

technical field [0001] The invention relates to a modified perovskite catalyst and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] At present, volatile organic compounds (volatile organic compounds, referred to as VOCs) have become one of the main sources of air pollutants. Its sources are very extensive. A large number of VOCs are produced in the production process of petroleum processing, paint, leather synthesis, electronics, printing, baking varnish, pharmaceuticals, automobile exhaust and other industries, and most of them have pungent odor, teratogenic, carcinogenic, and mutagenic effects. It is harmful to the atmospheric environment, animal and plant growth and human health. Therefore, the control and governance of VOCs is one of the focuses of modern environmental work. Catalytic combustion is an effective low-temperature VOCs purification technology, and in the entire catalytic combustion technology system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/83B01J23/889B01J23/26B01D53/86B01D53/44
CPCB01D53/8687B01D2257/708B01J23/002B01J23/26B01J23/34B01J23/83B01J23/8892B01J2523/00B01J2523/24B01J2523/3706B01J2523/72B01J2523/845
Inventor 李兵邓磊李俊华谭琨
Owner 江苏中创清源科技有限公司
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