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High-activity selective perovskite type photo-thermal catalyst as well as preparation method and application thereof

A selective, perovskite-type technology, applied in the direction of catalyst activation/preparation, catalysts, carbon compound catalysts, etc., can solve the problems of low catalytic efficiency and unfavorable catalytic activity

Pending Publication Date: 2021-09-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these photocatalysts are wide-bandgap oxides, and the electrons and holes recombine quickly, and there is no time to react with the reactants on the surface. The low catalytic efficiency is not conducive to catalytic activity.

Method used

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  • High-activity selective perovskite type photo-thermal catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A highly active and selective LaMn 0.5 Ni 0.5 o 3-δ The preparation method of photothermal catalyst comprises the following steps:

[0026] Step S1: 0.03mol of La(NO 3 ) 3 ·6H 2 O, 0.015mol of Mn(NO 3 ) 3 4H 2 O and 0.015mol Ni(NO 3 ) 3 ·6H 2 O mixed, added to 60mL deionized water;

[0027] Step S2: Add 0.072 mol of citric acid monohydrate according to the molar ratio of the total amount of nitrate and citric acid of 1:1.2 and mix evenly;

[0028] Step S3: heating and stirring the mixed solution in a water bath at 80°C until a sol is formed;

[0029] Step S4: Transfer to an oven and keep drying at 170°C, take it out and grind it into powder with a mortar;

[0030] Step S5: heat preservation at a calcination temperature of 700° C. for 7 hours, take out and grind to obtain a perovskite nano-powder.

Embodiment 2

[0032] A highly active and selective LaMn 0.5 co 0.5 o 3-δ The preparation method of photothermal catalyst comprises the following steps:

[0033] Step S1: 0.03mol of La(NO 3 ) 3 ·6H 2 O, 0.015mol of Mn(NO 3 ) 3 4H 2 O and 0.015mol of Co(NO 3 ) 3 ·6H 2 O mixed, added to 60mL deionized water;

[0034] Step S2: Add 0.072 mol of citric acid monohydrate according to the molar ratio of the total amount of nitrate and citric acid of 1:1.2 and mix well;

[0035] Step S3: heating and stirring the mixed solution in a water bath at 80°C until a sol is formed;

[0036] Step S4: Transfer to an oven and keep drying at 170°C, take it out and grind it into powder with a mortar;

[0037] Step S5: heat preservation at a calcination temperature of 700° C. for 7 hours, and obtain a perovskite nano-powder after taking it out.

Embodiment 3

[0039] A highly active and selective LaMn 0.5 Cu 0.5 o 3-δ The preparation method of photothermal catalyst comprises the following steps:

[0040] Step S1: 0.03mol of La(NO 3 ) 3 ·6H 2 O, 0.015mol of Mn(NO 3 ) 3 4H 2 O and 0.015mol of Cu(NO 3 ) 2 ·3H 2 O mixed and mixed, added to 60mL deionized water;

[0041] Step S2: Add 0.072 mol of citric acid monohydrate according to the molar ratio of the total amount of nitrate and citric acid of 1:1.2 and mix well;

[0042] Step S3: heating and stirring in a water bath at 80°C until a sol is formed;

[0043] Step S4: Transfer to an oven and keep drying at 170°C, take it out and grind it into powder with a mortar;

[0044] Step S5: heat preservation at a calcination temperature of 700° C. for 7 hours, and obtain a perovskite nano-powder after taking it out.

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Abstract

The invention discloses a high-activity selective perovskite type photo-thermal catalyst as well as a preparation method and application thereof. The chemical composition expression of the photo-thermal catalyst is LaMn < 0.5 > N < 0.5 > O < 3-delta >, wherein N is Co, Cu, Fe or Ni. A sol-gel method is used for preparation, the nano powder with fine particles, high purity and high catalytic activity can be obtained by the method, and the specific surface area of the obtained photo-thermal catalyst is 10.72-18.40 m < 2 > / g. The photo-thermal catalyst is applied to a photo-thermal catalytic reduction carbon dioxide system under the visible light condition of 150-350 DEG C, CO2 can be efficiently catalytically reduced into 10-100 [mu] mol of methane and 1-80 [mu] mol of methanol, the product selectivity is 60-99%, and it is verified that the prepared photo-thermal catalyst has high photo-thermal reduction efficiency and selectivity.

Description

technical field [0001] The invention relates to a high-activity and selectable perovskite-type photothermal catalyst, a preparation method and application thereof, and belongs to the technical field of photocatalytic reduction. Background technique [0002] At present, the use of fossil fuels will emit a large amount of carbon dioxide into the atmosphere during the combustion process. Carbon dioxide, as the main source of greenhouse gases, makes the global temperature continue to rise. flood. Therefore, the CO 2 Conversion to other useful chemicals is beneficial both ecologically and economically. Among the usual methods, photocatalysis is the first choice, because photocatalysis only needs solar radiation as energy source, and has been proven effective in various applications, under the action of photocatalysis, CO 2 conversion, which not only solves the CO 2 The problem of excessive concentration in the atmosphere, and more meaningful clean energy can be obtained. The...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J37/03B01J37/08C07C1/02C07C9/04C07C29/159C07C31/04
CPCB01J23/8892B01J23/002B01J37/036B01J37/082C07C1/02C07C29/159B01J2523/00C07C2523/889B01J35/39B01J35/23C07C9/04C07C31/04B01J2523/3706B01J2523/72B01J2523/847B01J2523/17B01J2523/842B01J2523/845Y02P20/52
Inventor 赵喆陈琳琳田金旦
Owner SHANGHAI INST OF TECH
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