Perovskite catalyst and preparation method and application thereof

A catalyst and perovskite technology, applied in the field of perovskite catalysts and their preparation and use, can solve the problems of high requirements for raw materials and reaction conditions, restricting the activity of perovskite, and being unfavorable for large-scale promotion, and achieving easy mass production. The effect of production, overcoming adverse effects, and simple and easy preparation method

Active Publication Date: 2020-05-22
TSINGHUA UNIV
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In view of the technical problems existing in the prior art, for example: the preparation method is complex, the required raw materials and reaction conditions are high, which is not conducive to large-scale promotion; the doped elements tend to be enriched on the surface of the perovskite, which hinders the catalytic performance. Active B-site elements limit the further improvement of perovskite activity. The present invention firstly provides a perovskite catalyst, which overcomes the impact of strontium elements enriched on the surface compared with ordinary doped perovskite catalysts. Unfavorable effects brought by catalyst activity, and the perovskite catalyst of the present invention also has high stability, is a kind of catalyst of environment-friendly efficient catalytic oxidation volatile organic compound (VOCs)

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
  • Perovskite catalyst and preparation method and application thereof
  • Perovskite catalyst and preparation method and application thereof
  • Perovskite catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] The first aspect of the present invention provides a kind of preparation method of perovskite catalyst, it comprises the following steps:

[0049] The raw material solution is adsorbed by a template agent to obtain a catalyst precursor;

[0050] heat-treating the catalyst precursor to obtain a doped perovskite compound;

[0051] Dissolving the complex at least partially, through the dissolution to at least partially remove the B element on the surface of the complex; wherein,

[0052] The doped perovskite compound has a composition of the following formula (I):

[0053] A 1-x B x CO 3 (I)

[0054] B means doped in ACO 3 The metal elements in the type perovskite structure, the A element is selected from rare earth metals, the B element is selected from alkaline earth metals, and C is selected from transition metals, 0<x<1.

[0055] Compared with the common doped perovskite catalyst, the perovskite catalyst of the present invention overcomes the adverse effect of ...

Embodiment 1

[0096] Step 1: Weigh 10.39g of lanthanum nitrate, 1.27g of strontium nitrate, and 8.73g of cobalt nitrate in 18mL of deionized water, and stir at room temperature for 2 hours;

[0097] Step 2: adding 2 g template polymethyl methacrylate (PMMA) microspheres into the solution obtained in Step 1 and soaking for 10 h;

[0098] Step 3: Filter the solution in Step 2, and dry the remaining solid at room temperature for 24 hours;

[0099] Step 4: Place the dry powder obtained in Step 3 in a tube furnace, raise it from room temperature to 300 °C at a rate of 1 °C / min in a nitrogen atmosphere, and keep it at this temperature for 3 hours, then lower it to room temperature, switch to an air atmosphere at a temperature of 1 °C / min ramp up to 300°C and hold at this temperature for 1h, and finally rise to 900°C and hold at this temperature for 4h. After cooling, the obtained sample is La 0.8 Sr 0.2 CoO 3 .

[0100] Step 5: La obtained from Step 4 0.8 Sr 0.2 CoO 3 The powder was treat...

Embodiment 2

[0104] Step 1: Weigh 11.69g of lanthanum nitrate, 0.64g of strontium nitrate, and 8.73g of cobalt nitrate in 18mL of deionized water, and stir at room temperature for 2 hours;

[0105] Step 2: adding 2 g template polymethyl methacrylate (PMMA) microspheres into the solution obtained in Step 1 and soaking for 10 h;

[0106] Step 3: Filter the solution in Step 2, and dry the remaining solid at room temperature for 24 hours;

[0107] Step 4: Place the dry powder obtained in Step 3 in a tube furnace, raise it from room temperature to 300 °C at a rate of 1 °C / min in a nitrogen atmosphere, and keep it at this temperature for 3 hours, then lower it to room temperature, switch to an air atmosphere at a temperature of 1 °C / min ramp up to 300°C and hold at this temperature for 1h, and finally rise to 900°C and hold at this temperature for 4h. After cooling, the obtained sample is La 0.9 Sr 0.1 CoO 3 .

[0108] Step 5: La obtained from Step 4 0.9 Sr 0.1 CoO 3 The powder was treat...

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
Average pore sizeaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention provides a perovskite catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adsorbing a raw material solution by using atemplate agent to obtain a catalyst precursor; carrying out heat treatment on the catalyst precursor to obtain a doped perovskite type composite; at least partially dissolving the composite, by meansof which the B element on the surface of the composite is at least partially removed; wherein the doped perovskite type composite has a composition A<1-x>BxCO3 (I); the B represents a metal element doped in an ACO3 type perovskite structure, the element A is selected from rare earth metals, the element B is selected from alkaline earth metals, the element C is selected from transition metals, andthe x is greater than 0 and less than 1. The perovskite catalyst provided by the invention overcomes the adverse effect of the strontium element enriched on the surface on the activity of the catalyst, and has high catalytic activity.

Description

technical field [0001] The invention relates to the purification treatment of volatile organic waste gas, in particular to a perovskite catalyst and its preparation method and use, in particular to a perovskite catalyst for efficiently catalyzing and oxidizing VOCs and its preparation and use, and belongs to the field of environmental protection technology. Background technique [0002] Volatile organic compounds (VOCs) are one of the main air pollutants nowadays, which are not only extremely harmful to human health, but also harmful to the environment. Volatile organic compounds mainly come from daily life such as building materials and decoration materials, as well as industries such as chemical industry and power plant boiler exhaust. The vast majority of volatile organic compounds (such as low-carbon hydrocarbons, aromatic hydrocarbons, aldehydes, etc.) are toxic, foul-smelling, flammable and explosive, not only polluting the ecological environment (such as generating ph...

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): B01J23/83B01D53/72B01D53/86B01J35/10
CPCB01J23/83B01D53/8668B01J35/60B01J35/613B01J35/651
Inventor 彭悦司文哲陈建军李俊华
Owner TSINGHUA UNIV
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