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Method for preparing perovskite catalyst by laser ablation

A technology of laser ablation and perovskite, applied in chemical instruments and methods, catalyst activation/preparation, heterogeneous catalyst chemical elements, etc., can solve the problem of small specific surface area, low catalytic activity and poor thermal stability of perovskite catalysts and other issues to achieve the effect of performance improvement and catalytic performance improvement

Inactive Publication Date: 2019-01-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to overcome the disadvantages of poor thermal stability, small specific surface area and low catalytic activity of the perovskite catalyst obtained by the existing synthesis method, and adopt the method of gel sintering and then high-energy laser ablation Greatly improved the thermal stability and catalytic activity of the catalyst, and further promoted the development of automobile exhaust catalysis research

Method used

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  • Method for preparing perovskite catalyst by laser ablation
  • Method for preparing perovskite catalyst by laser ablation
  • Method for preparing perovskite catalyst by laser ablation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take by weighing 12.99g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 6.625g manganese acetate (C 4 h 6 MnO 4 4H 2 O) Dissolve in 600mL deionized water to form a solution with a total metal ion concentration of 0.1mol / L, then add 10.8g of glucose to the mixed solution, and stir until uniformly mixed. Then the mixture was evaporated to dryness (60°C) on a rotary evaporator until a honey-like wet gel was formed, and then the wet gel was transferred to a crucible and dried in an oven at 80°C (air atmosphere) for 12 hours to obtain a fluffy, brittle, Pale yellow dry gel;

[0030] The xerogel obtained above is fully impregnated in a platinum / palladium (Pt / Pd) mixed solution containing 1.3404g;

[0031] The temperature was raised to 400°C at 3°C / min in the air atmosphere of the muffle furnace and kept for 2 hours to completely decompose the nitrate in the precursor, and then the temperature was raised to 800°C for 3 hours at 10°C / min to prepare the perovskite catalyst.

[...

Embodiment 2

[0035] Take by weighing 12.99g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 5.880g manganese acetate (C 4 h 6 MnO 4 4H 2 O) Dissolve in 600mL deionized water to form a solution with a total metal ion concentration of 0.1mol / L, then add 10.8g of glucose to the mixed solution, and stir until uniformly mixed. Then the mixture was evaporated to dryness (60°C) on a rotary evaporator until a honey-like wet gel was formed, and then the wet gel was transferred to a crucible and dried in an oven at 80°C (air atmosphere) for 12 hours to obtain a fluffy, brittle, Pale yellow dry gel;

[0036] The xerogel obtained above is fully impregnated in a platinum / palladium (Pt / Pd) mixed solution containing 2.6808g;

[0037] The temperature was raised to 400°C at 3°C / min in the air atmosphere of the muffle furnace and kept for 2 hours to completely decompose the nitrate in the precursor, and then the temperature was raised to 800°C for 3 hours at 10°C / min to prepare the perovskite catalyst.

[...

Embodiment 3

[0040] Take by weighing 12.99g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 5.145g manganese acetate (C 4 h 6 MnO 4 4H 2 O) Dissolve in 600mL deionized water to form a solution with a total metal ion concentration of 0.1mol / L, then add 10.8g of glucose to the mixed solution, and stir until uniformly mixed. Then the mixture was evaporated to dryness (60°C) on a rotary evaporator until a honey-like wet gel was formed, and then the wet gel was transferred to a crucible and dried in an oven at 80°C (air atmosphere) for 12 hours to obtain a fluffy, brittle, Pale yellow dry gel;

[0041] The xerogel obtained above is fully impregnated in a platinum / palladium (Pt / Pd) mixed solution containing 4.0212g;

[0042] The temperature was raised to 400°C at 3°C / min in the air atmosphere of the muffle furnace and kept for 2 hours to completely decompose the nitrate in the precursor, and then the temperature was raised to 800°C for 3 hours at 10°C / min to prepare the perovskite catalyst.

[...

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Abstract

The invention discloses a method for preparing a perovskite catalyst by laser ablation. Through a sol-gel method, glucose is used as a complexing agent to make operation simple and easy to be carriedout without being affected by pH. A solvent is removed by rapid evaporation using a rotary evaporator instead of a conventional long-time constant temperature water bath, and then dried in a dry box to prepare a xerogel, and the xerpgel is then calcined at a high temperature to obtain a desired material. Finally, a liquid phase laser ablation method is used for increasing the amount of active oxygen and increasing the concentration of oxygen vacancies on the surface of oxide. The active oxygen vacancies are introduced to improve catalytic activity. Under the operating conditions of a diesel engine, soot particles are directly oxidized, the emission of particulate matter is reduced, and air pollution is reduced.

Description

[0001] The application of the present invention is a divisional application of the parent application "a perovskite catalyst and its laser ablation preparation method and application". The application number of the parent application is 201610861762X, and the application date is September 28, 2016. technical field [0002] The invention relates to the technical field of new materials, and more specifically, relates to a synthesis preparation method and application of a perovskite catalyst. Background technique [0003] Diesel engines are widely used in production and life because of their advantages such as high thermal efficiency, low fuel consumption rate and wide power coverage. However, the emission of particulate matter in the exhaust of diesel engines is 30 to 70 times that of gasoline engines, resulting in serious air and environmental pollution. The particle size of most particles is less than 1 μm, which can not only penetrate into the human respiratory tract, but a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656F01N3/28
CPCB01J23/002B01J23/6562B01J37/349B01J2523/00F01N3/2803B01J2523/3706B01J2523/824B01J2523/828B01J2523/72Y02A50/2351
Inventor 龚彩荣司马晋强毛腾范国樑
Owner TIANJIN UNIV
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