A monolithic catalyst having perovskite oxide skeleton and preparation method thereof

A technology of perovskite oxides and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. change, increase the cost of catalyst preparation and other issues

Active Publication Date: 2020-07-07
HUAZHONG NORMAL UNIV
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  • Application Information

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Problems solved by technology

[0004] The invention patent of Chinese Patent Publication No. CN 104399480A discloses a method for preparing a monolithic three-dimensional ordered macroporous structure perovskite catalyst. The polystyrene colloidal crystal template is assembled by centrifugation, and then metal ions are mixed with nitric acid by impregnation. The salt precursor is filled into the template, and finally the template is removed by high-temperature calcination to obtain a three-dimensional ordered macroporous structure perovskite catalyst; the three-dimensional ordered macroporous catalyst obtained above is a monolithic macroporous aggregate, which cannot be applied onto the actual cordierite support;
[0006] The monolithic three-dimensional ordered macroporous c

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  • A monolithic catalyst having perovskite oxide skeleton and preparation method thereof
  • A monolithic catalyst having perovskite oxide skeleton and preparation method thereof
  • A monolithic catalyst having perovskite oxide skeleton and preparation method thereof

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Embodiment 1

[0051] This embodiment provides a three-dimensional ordered macroporous perovskite La 0.8 Sr 0.2 CoO 3 The method for growing the skeleton to the surface of the cordierite honeycomb ceramics, the specific steps are as follows:

[0052] 1. Washing of cordierite carrier

[0053] Cut commercial cordierite honeycomb ceramics (1mm×1mm square channel) into cube-shaped samples with a size of 1cm×1cm×1cm, and then ultrasonically clean them with distilled water, hexane, acetone, and ethanol in sequence, and the cleaning time for each solvent is 10min; then put the cleaned honeycomb ceramic carrier in an oven at 80°C to dry for 4h to obtain a clean honeycomb ceramic substrate for use;

[0054] 2. Preparation of perovskite precursor colloidal solution

[0055] Dissolve 1.92mM lanthanum nitrate, 0.48mM strontium nitrate, and 2.4mM cobalt nitrate in a mixed solvent of 15mL ethylene glycol and 10mL methanol, ultrasonically dissolve and disperse it completely, then stir continuously at r...

Embodiment 2

[0070] In order to further evaluate the catalytic activity of the catalyst of the present invention, the present invention uses a gas-phase catalytic oxidation activity evaluation experiment for evaluation.

[0071] Methane (CH 4 ) The catalytic combustion activity evaluation test is carried out in a fixed-bed reactor simulated by a quartz tube with a diameter of 23 mm. 700 mg of the monolithic catalyst (about 60-70 mg of perovskite active components) was loaded into a quartz tube, and the quartz tube was placed in a tube furnace, and the temperature was raised from room temperature to 750° C. by program. The reaction gas composition (volume fraction) is: 1% CH 4 ,20%O 2 ,79%N 2 , the total flow rate is 50mL / min, and the mass space velocity is 43000mL / (g h). The composition of the final reaction tail gas was analyzed online by Fuli GC-9790 gas chromatograph, CH 4 The formula for calculating the conversion rate is:

[0072] CH 4 Conversion rate (%) = (import CH 4 Peak A...

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Abstract

The invention discloses a monolithic catalyst having a perovskite oxide skeleton and a preparation method of the monolithic catalyst. According to the catalyst, honeycomb ceramic with honeycomb ductsis used as a carrier; a perovskite oxide nanoparticle coating is arranged on the surfaces of the honeycomb ducts, a perovskite oxide skeleton layer is directly arranged on the perovskite oxide nanoparticle coating, and perovskite oxide skeletons are provided with hollow holes which are communicated with one another. According to the invention, the perovskite oxide skeleton layer is directly arranged on the perovskite oxide nanoparticle coating; therefore, the perovskite oxide skeleton layer can be fixed in the honeycomb duct without using an adhesive; compared with a traditional powder type coating catalyst, the macroporous structure can greatly improve the mutual contact between the catalyst and gas-phase small molecules, increase catalytic reaction active sites and improve the diffusionefficiency of gas-phase reactants, thereby improving the catalytic efficiency of the catalyst.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a catalyst with a perovskite oxide framework and a manufacturing method thereof, in particular to a method for directly growing a three-dimensional ordered macroporous perovskite oxide framework onto the surface of a cordierite honeycomb ceramic . Background technique [0002] For nearly half a century, with the gradual increase in the degree of global industrial automation and technology, the problem of environmental pollution has become more and more serious. The first to bear the brunt is the problem of air pollution in cities. As the number of motor vehicles worldwide increases year by year, carbon monoxide (CO), hydrocarbons (CHx), nitrogen oxides (NOx) and other pollution emitted from internal combustion engines of motor vehicles Reactive gases are extremely harmful to human health, so governments and institutions around the world have successively formulated increa...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01D53/86B01D53/72B01D53/62
CPCB01J23/83B01D53/864B01D2257/7025B01D2257/502B01D2255/2063B01D2255/20746Y02C20/20Y02A50/20
Inventor 郭彦炳杨吉邓红涛
Owner HUAZHONG NORMAL UNIV
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