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A hollow core-shell spherical lamno with mesoporous walls 3 Perovskite catalyst and preparation method thereof

A catalyst and perovskite technology, which is applied in the field of mesoporous wall hollow core-shell spherical LaMnO3 perovskite catalyst and its preparation, can solve the problems of small space for morphology control, high energy consumption, low yield, etc.

Active Publication Date: 2020-10-20
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the studies in the above-mentioned literature all use solvothermal method or hard film method or soft template-solvothermal combined method, solvothermal method, high energy consumption and low yield
The preparation of perovskite by the hard template method has a small space for shape control, and the yield is low when the impregnation adsorption method is used

Method used

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  • A hollow core-shell spherical lamno with mesoporous walls <sub>3</sub> Perovskite catalyst and preparation method thereof
  • A hollow core-shell spherical lamno with mesoporous walls <sub>3</sub> Perovskite catalyst and preparation method thereof
  • A hollow core-shell spherical lamno with mesoporous walls <sub>3</sub> Perovskite catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 4.3301g (0.01mol) La(NO 3 ) 3 • 6H 2 O, 3.5790g of 50wt% Mn(NO 3 ) 2 Solution (where Mn(NO 3 ) 2 The dosage is 1.7895g (0.01mol) and 3.8426g (0.02mol) of citric acid are dissolved in 110mL of water to obtain the first solution; according to the molar ratio of total metal nitrate to P123 of 60:1, weigh 1.9333g (3.3333×10 -4 mol) P123 is dissolved in a mixed solution consisting of 10mL deionized water and 20mL absolute ethanol to obtain the second solution; the second solution is added dropwise to the first solution, and the mixture is sealed and stirred at 25°C for 10h to obtain P123 The third solution with a mole fraction of 2.381 mmol / L; place the third solution in a blast drying box at 40°C and evaporate to a gel state, then heat to 150°C and dry for 4 hours to obtain a catalyst precursor; combine the prepared catalyst The precursor is placed in a muffle furnace and fired at 700°C for 5 hours. Finally, a hollow core-shell spherical LaMnO with a mesoporous wall is ...

Embodiment 2

[0029] Weigh 4.3301g (0.01mol) La(NO 3 ) 3 • 6H 2 O, 3.5790g of 50wt% Mn(NO 3 ) 2 Solution (where Mn(NO 3 ) 2 The dosage is 1.7895g (0.01mol) and 3.8426g (0.02mol) of citric acid are dissolved in 110mL of water to obtain the first solution; according to the ratio of total metal nitrate to P123 molar ratio of 65:1, weigh 1.7846g ( 3.0769×10 -4 mol) P123 is dissolved in a mixed solution of 10mL deionized water and 20mL absolute ethanol to obtain the second solution. The second solution is added dropwise to the first solution, and it is sealed and stirred at 35°C for 10h to prepare P123 The third solution with a mole fraction of 2.198mmol / L; place the third solution in a blast drying oven at 40°C to a gel state, then heat to 150°C and dry for 4 hours to obtain a catalyst precursor; the prepared catalyst precursor The body is placed in a muffle furnace and fired at 700°C for 5 hours. Finally, the mesoporous wall hollow core-shell spherical LaMnO 3 The perovskite catalyst was named s...

Embodiment 3

[0031] Weigh 4.3301g (0.01mol) La(NO 3 ) 3 • 6H 2 O, 3.5790g of 50wt% Mn(NO 3 ) 2 Solution (where Mn(NO 3 ) 2 The dosage is 1.7895g (0.01mol) and 3.8426g (0.02mol) of citric acid are dissolved in 82.5mL of water to obtain the first solution; according to the ratio of total metal nitrate to P123 molar ratio of 70:1, weigh 1.6571g (2.8571×10 -4 mol) P123 is dissolved in a mixed solution composed of 7.5mL deionized water and 15mL absolute ethanol to obtain the second solution; and the second solution is added dropwise to the first solution, and stirred at 30°C for 10h to prepare The third solution with a mole fraction of P123 of 2.721mmol / L, put the third solution in a blast drying box at 40°C and evaporate to a gel state, then heat to 150°C and fully dry for 4h to obtain the catalyst precursor; The catalyst precursor was placed in a muffle furnace and calcined at 700°C for 5 hours. Finally, the mesoporous wall hollow core-shell spherical LaMnO 3 The perovskite catalyst was named s...

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Abstract

The invention discloses a mesoporous wall hollow core-shell spherical LaMnO 3 Perovskite catalyst and its preparation method, characterized in that the catalyst has a sphere outer diameter of 100-750nm and its mesoporous wall is constructed of rod-shaped nanoparticles of ø26×52nm, LaMnO 3 The average pore diameter of the mesopores in the mesopore wall of the perovskite catalyst is 67.81 nm, and the pore volume is 0.15 cm. 3 / g, specific surface area 15.56 m 2 / g, the preparation method includes using P123 as a soft template agent, water and ethanol as solvents, citric acid as complexing agent, La and Mn as metal sources to prepare mesoporous wall hollow core-shell spherical LaMnO 3 Precursor steps: Place the catalyst precursor in a muffle furnace and bake it at 700°C for 5 hours to obtain mesoporous wall hollow core-shell spherical LaMnO 3 The perovskite catalyst step has the advantages of low energy consumption, nearly 100% yield and controllable product morphology, and can be used for automobile exhaust purification.

Description

Technical field [0001] The present invention relates to a LaMnO 3 Perovskite catalyst, especially relates to a mesoporous wall hollow core-shell spherical LaMnO 3 Perovskite catalyst and its preparation method. Background technique [0002] Compared with the currently used precious metal automobile exhaust catalysts, the non-precious metal rare earth perovskite composite oxide ABO 3 It has the advantages of abundant resources, low cost, stable structure and easy chemical tailoring. It has great application prospects in the field of catalytic purification of automobile exhaust and flue gas. The porous hollow spherical catalyst has a special spatial geometric structure, has the advantages of low density, high specific surface area, and large internal cavity, so that it has better catalytic performance than conventional bulk and solid nanoparticles. [0003] The existing preparation methods of hollow spherical perovskite mainly include solvothermal method and template method and a com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J35/08B01J35/10B01J37/03B01J37/08B01D53/94B01D53/56
CPCB01D53/9413B01J23/002B01J23/34B01J37/036B01J37/082B01J35/397B01J35/51B01J35/613B01J35/651B01J35/633
Inventor 王丽吴丽慧金云龙姜秋伶王颖
Owner NINGBO UNIV