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A kind of perovskite catalyst and its preparation method and in-situ testing method

A perovskite and catalyst technology, which is applied in the field of high-performance catalyst materials, can solve problems such as poor reproducibility and uneven distribution of active components, and achieve good efficiency, excellent anti-carbon deposition, and improved anti-coking performance.

Inactive Publication Date: 2021-04-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supported catalysts are generally obtained by the impregnation method, which generally has poor reproducibility and easily leads to uneven distribution of active components on the surface of the carrier

Method used

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  • A kind of perovskite catalyst and its preparation method and in-situ testing method
  • A kind of perovskite catalyst and its preparation method and in-situ testing method
  • A kind of perovskite catalyst and its preparation method and in-situ testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Implementation Example 1, Ni-doped LaMnO 3 Based perovskite materials

[0056] Some studies have shown that the A-site vacancy of perovskite can provide a driving force to precipitate B-site elements so that the local changes back to ABO 3 ideal structure. La 0.9 mn 0.8 Ni 0.2 o 3 Precursor powder. In order to observe the effect after reduction alone, 800 degrees 5% H 2 -N 2 After 6 hours of reduction, the powder was taken out from the quartz tube. Through scanning electron microscopy, it was found that Ni particles of about 20 nm were evenly dispersed on the surface of the perovskite particles. The distribution of Ni particles was significantly more uniform than that of ordinary supported catalysts, which can be further confirmed by TEM. Precipitation of Ni particles and strong adhesion. After confirming the good precipitation effect, the perovskite precursor was pretreated in the self-made reactor according to the same reduction conditions, and then switched ...

Embodiment 2

[0058] Implementation Example 2, Ni-doped LaSrCrO 3 Based perovskite materials

[0059] Synthesis of La by sol-gel method according to stoichiometric ratio 0.8 Sr 0.1 Cr 0.85 Ni 0.15 o 3 Type A vacant perovskite materials are fired at a high temperature of 1300 degrees to form phases. 800 degrees 5% H 2 -N 2 A large number of Ni particles were uniformly dispersed on the surface of the substrate after being reduced under the atmosphere for 4 hours, and the X-ray diffraction analysis detected that the substrate still maintained the perovskite structure, indicating that this type of perovskite material has good thermal stability. Due to the precipitation of a large amount of metal Ni, at 800 degrees 5%H 2 -N 2 The in situ precipitation-type perovskite materials in the atmosphere have good electrical conductivity, and these advantages can make this Ni-precipitation-type perovskite materials have a wide range of applicability.

Embodiment 3

[0060] Implementation Example 3, Ni-doped LaTiO 3 Based perovskite materials

[0061] By solid-phase method, according to the stoichiometric ratio La 0.6 Ca 0.2 Ni 0.1 Ti 0.9 o 3 Weigh La 2 o 3 , CaCO 3 ,TiO 2 , Ni(NO 3 ) 2 ·6H 2 After ball milling and mixing, press into blocks and bake at a high temperature of 1400 degrees for 12 hours to form a phase. Powder at 900 degrees 5% H 2 -N 2 After 4 hours of reduction pretreatment in the atmosphere, a large number of Ni particles were uniformly dispersed on the surface of the substrate, and the X-ray diffraction analysis detected that the substrate still maintained the perovskite structure, indicating that this type of perovskite material has good thermal stability.

[0062] The above examples illustrate that the present invention covers the surface of the catalyst substrate by in-situ precipitation of nanoparticles used for catalysis, provides good catalytic performance, avoids carbon deposition in the reforming reac...

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Abstract

The invention discloses a novel solid catalyst material for methane carbon dioxide reforming reaction, a corresponding widely applicable preparation method, and a simple and easy-to-operate test and reaction process flow. For the perovskite catalyst, the substrate is a perovskite material in which B-site doped metal nanoparticles are precipitated in situ while there are cation vacancies in the A site; the surface of the substrate is covered with in situ precipitated B-site highly active metals for catalysis Nanoparticles; wherein, the A site is any one of rare earth elements and alkaline earth metal elements, and the B site matrix is ​​a doped transition metal with multiple valence states. The perovskite catalyst of the present invention can provide good catalytic performance and avoid carbon deposition in reforming reaction and catalyst deactivation caused thereby. At the same time, the preparation and testing method of in-situ precipitation-in-situ reaction has the characteristics of simple operation, practicality, high efficiency and novelty, and has a good application prospect in the preparation and testing process of catalysts.

Description

technical field [0001] The invention belongs to the field of solid catalysts in the field of industrial catalysis, and more specifically relates to a high-performance catalyst material used in methane carbon dioxide reforming reaction and a corresponding convenient synthesis method and testing method thereof. Background technique [0002] As we all know, the use of fossil fuels as our main energy source will produce many greenhouse gases that will have adverse effects on the environment, among which carbon dioxide is one of the main reasons that cause the greenhouse effect and lead to the deterioration of the global climate. The emission of carbon dioxide has become a global problem to be solved urgently. On the other hand, carbon dioxide is an abundant renewable carbon resource, from which many chemical value-added products can be derived. Carbon sequestration is a promising approach to address CO2 emissions. But carbon dioxide is a very stable molecule, and converting it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/00B01J23/83B01J23/86B01J23/889C01B3/40G01N31/10
CPCB01J23/002B01J23/83B01J23/866B01J23/8892C01B3/40G01N31/10Y02P20/52
Inventor 蒲健韦童池波李箭段男奇贾礼超颜冬
Owner HUAZHONG UNIV OF SCI & TECH
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