Perovskite catalyst and its laser ablation preparation method and application

A catalyst and perovskite technology, applied in the field of synthesis and preparation of perovskite catalysts, can solve the problems of small specific surface area, low catalytic activity, poor thermal stability of perovskite catalysts, etc., and achieve the effect of improving performance and catalytic performance.

Inactive Publication Date: 2017-04-05
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 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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  • Perovskite catalyst and its laser ablation preparation method and application
  • Perovskite catalyst and its laser ablation preparation method and application
  • Perovskite catalyst and its laser ablation preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0028] 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;

[0029] The xerogel obtained above is fully impregnated in a platinum / palladium (Pt / Pd) mixed solution containing 1.3404g;

[0030] 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

[0034] 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;

[0035] The xerogel obtained above is fully impregnated in a platinum / palladium (Pt / Pd) mixed solution containing 2.6808g;

[0036] 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

[0039] 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;

[0040] The xerogel obtained above is fully impregnated in a platinum / palladium (Pt / Pd) mixed solution containing 4.0212g;

[0041] 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 perovskite catalyst and its laser ablation preparation method and application. The preparation method utilizes a sol-gel method and glucose as a complexing agent so that the operation is simple and easy and pH influence is avoided. Rotary evaporator rapid evaporation replaces the conventional long-term constant temperature water bath to remove a solvent, dry gel is prepared through drying in a dry oven, a desired material is obtained by calcining at a high temperature, and through a liquid-phase laser ablation method, the number of reactive oxygen is increased, the concentration of oxygen vacancies on the surface of the oxide is increased, active oxygen vacancies are introduced and the catalytic activity is increased so that the direct oxidation of soot particles under diesel engine operation is realized, the emission of particulate matters is reduced and air pollution is reduced.

Description

technical field [0001] 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 [0002] 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 also enrich a variety of harmful metals, polycyclic aromatic hydrocarbons, dioxins and other strong carcinogenic organic substances, which are extremely harmful to human health. As a result, many countries have enacted increasingly stringent emission regulations to limit diesel particulate matter emis...

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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