Double perovskite type metal oxide catalyst and preparation method thereof

A double perovskite and catalyst technology, applied in the field of double perovskite metal oxide catalyst and its preparation, can solve the problems of low catalytic activity and poor high temperature stability, and achieve high catalytic activity, increased specific surface area, high The effect of specific surface area

Active Publication Date: 2015-12-02
ENN SCI & TECH DEV
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of double perovskite metal oxide catalyst

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Double perovskite type metal oxide catalyst and preparation method thereof
  • Double perovskite type metal oxide catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The embodiment of the present invention also provides a method for preparing a double perovskite type metal oxide catalyst, such as figure 1 Shown, including:

[0021] Step S1: Mix the metal salt solution with the precipitant solution, react to generate a mixed liquid containing precipitates, and separate the precipitates from the mixed liquid containing precipitates; wherein the metal salt solution can be a nitrate solution or an acetate solution , Hydrochloride solution or sulfate solution, the precipitant solution can be a precipitant solution containing hydroxide ions or carbonate ions, such as ammonia solution or sodium hydroxide solution; the metal salt solution and The reaction conditions for mixing the precipitant solution can be: the reaction temperature is 0-40°C, such as 20°C or 30°C; the concentration of the metal salt solution is 1-5 mol / L, such as 3mol / L or 4mol / L; The concentration is 0.1 to 5 mol / L, preferably 1 to 5 mol / L, for example, 3 mol / L or 4 mol / L. ...

Embodiment 1

[0034] Step S1. A nitrate aqueous solution or acetate solution with a concentration of 1 to 5 mol / L is configured as a metal salt aqueous solution, an ammonia solution with a concentration of 1 to 5 mol / L is configured as a precipitating agent aqueous solution, and the metal salt aqueous solution and the precipitating agent aqueous solution, etc. The volume is mixed quickly so that the reaction can proceed quickly and produce a precipitate. In this way, more crystal nuclei can be quickly generated, the particle size of the catalyst can be reduced, and a catalyst material with a high specific surface area can be obtained. At the same time, the reaction process is controlled to be carried out in an environment of 0-40°C, and a lower temperature can inhibit the growth rate of crystal nuclei and promote the generation rate of crystal nuclei.

[0035] Step S2, uniformly disperse the precipitate generated in the above step S1 in water or alcohol solvent to obtain a precipitate suspensi...

Embodiment 2

[0041] Step S1. The nitrate aqueous solution or acetate aqueous solution with a concentration of 1 to 5 mol / L is configured as the metal salt aqueous solution, and the sodium hydroxide solution with a concentration of 1 to 5 mol / L is configured as the precipitation agent aqueous solution, and the metal salt aqueous solution is added dropwise to In the aqueous precipitant solution, a precipitate is formed. In this way, metal ions can be precipitated instantaneously at the same time, generating more crystal nuclei, reducing the particle size of the catalyst, and obtaining a catalyst material with a high specific surface area. At the same time, the reaction process is controlled to be carried out in an environment of 0-40°C, and a lower temperature can inhibit the growth rate of crystal nuclei and promote the generation rate of crystal nuclei.

[0042] Step S2, uniformly disperse the precipitate generated in the above step S1 in water or alcohol solvent to obtain a precipitate suspe...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Concentrationaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

Relating to the technical field of catalysts, the invention discloses a double perovskite type metal oxide catalyst and a preparation method thereof to solve the problems of low catalytic activity and poor high-temperature stability o existing LaMnO3. The general formula of the double perovskite type metal oxide catalyst is: La1-xMxD1-yMnyO3, wherein x=0-0.6, y=0.7-1, M is alkali metal ion or alkaline earth metal ion, and D is +1, +2 or +3 valence metal ion. According to the double perovskite type metal oxide catalyst provided by the invention, the M ion and D ion are introduced to adjust the composition and structure of the perovskite metal oxide and increase the specific surface area, thereby enhancing the catalytic activity and high temperature stability of the catalyst. The catalyst provided by the invention is mainly applied to catalytic combustion of methane.

Description

Technical field [0001] The invention relates to the technical field of catalysts, in particular to a double perovskite type metal oxide catalyst and a preparation method thereof. Background technique [0002] With increasing attention to energy shortages and environmental pollution, the clean and efficient use of energy has attracted more and more attention and attention from the society. Among them, methane is the main component of natural gas, shale gas and combustible ice, and its effective utilization is the focus of attention. Catalytic combustion of methane is a new type of methane combustion technology, because of its high efficiency and avoiding NO x The formation of environmental pollutants such as nitrogen oxides and CO (carbon monoxide) has become a hot research direction in this field, and catalysts, as the key materials for the catalytic combustion of methane, are the research focus. [0003] At present, because the perovskite-type metal oxide catalyst has certain adv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01J23/889
Inventor 丁天朋赵伟靳琳浩
Owner ENN SCI & TECH DEV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap