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Low temperature preparation method of layered perovskite

A perovskite, layered technology, applied in the field of layered perovskite preparation, can solve the problems of unfavorable wide application, harsh preparation conditions, low specific surface area, etc., and achieves low cost, low preparation temperature and high catalytic activity. Effect

Inactive Publication Date: 2015-09-02
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This leads to the fact that such materials generally have a low specific surface area, and the harsh preparation conditions make it difficult to realize, which is not conducive to its wide application.

Method used

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Embodiment 1

[0020] 6.50 g La(NO 3 ) 3 ·6H 2 O (15 mmol), 2.68 g Mn(NO 3 ) 2 solution (50 wt%, 7.5 mmol), and 0.50 g MnCl 2 (2.5 mmol) was dissolved in water to form solution A; 6.33 g citric acid (30 mmol) was mixed with 2.25 g NH 4 HCO 3 (28.5 mmol) was dissolved in water to form solution B. Mix A and B solutions, stir evenly, distill under reduced pressure, lose water to form a thick jelly, then dry and roast at 700 °C for 5 h to obtain a blue-black precursor powder. Weigh 1.00 g of precursor powder, containing 0.10 mol L -1 NH 4 HCO 3 solution in an autoclave, reacted at 80 °C for 12 h, separated by suction filtration, washed with deionized water and ethanol, dried, and then calcined at 800 °C for 2 h to obtain blue-black layered perovskite La 3 mn 2 o 7+δ powder.

Embodiment 2

[0022] 2.17 g La(NO 3 ) 3 ·6H 2 O (5 mmol), 2.39 g Ca(NO 3 ) 2 4H 2O (10 mmol), 2.68 g Mn(NO 3 ) 2 solution (50 wt%, 7.5 mmol), and 0.50 g MnCl 2 (2.5 mmol) was dissolved in water to form solution A; 6.33 g citric acid (30 mmol) was mixed with 2.25 g NH 4 HCO 3 (28.5 mmol) was dissolved in water to form solution B. Mix A and B solutions, stir evenly, distill under reduced pressure, lose water to form a thick jelly, dry, and then roast at 800 °C for 5 h to obtain the precursor powder. Weigh 1.00 g of precursor powder, containing 0.10 mol L -1 NH 4 HCO 3 solution in an autoclave, reacted at 120 °C for 12 h, separated by suction filtration, washed with deionized water and ethanol, dried, and then roasted at 800 °C for 2 h to obtain the layered perovskite LaCa 2 mn 2 o 7 powder.

Embodiment 3

[0024] 1.73 g La(NO 3 ) 3 ·6H 2 O (4 mmol), 0.53 g Ba(NO 3 ) 2 and 1.17 g Co(NO 3 ) 2 ·6H 2 O (4 mmol) was dissolved in water to form solution A; 2.53 g of citric acid (12 mmol) and 0.26 g of p-chloroaniline (2 mmol) were dissolved in water to form solution B. Mix A and B solutions, stir evenly, distill under reduced pressure, lose water to form a thick jelly, dry, and then roast at 1000 °C for 2 h to obtain the precursor powder. Weigh 1.00 g of precursor powder, containing 0.10 mol L -1 NH 4 HCO 3 solution in an autoclave at 120 °C for 8 h, then separated by suction filtration, washed with deionized water and ethanol, dried, and then calcined at 700 °C for 2 h to obtain a blue-black layered perovskite La 2 BaCo 2 o 7 powder.

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Abstract

The invention discloses a low temperature preparation method of Ruddlesden-Popper type layered perovskite. By using ''chloride ion induction effect'', a uniform layered precursor containing the chloride ions is formed, then the chloride ions in the precursor are dissociated and removed, and thus the layered structure is obtained. Compared with a traditional R-P type layered perovskite preparation method, the method has the advantage that the preparation temperature in the method is greatly reduced, so that the application scope of the type of the materials is expanded. The obtained materials possess high performance in the aspects of specific surface, thermal stability, electromagnetic performance, catalytic activity and the like.

Description

technical field [0001] The invention relates to a preparation method of layered perovskite, in particular to a Ruddlesden-Popper type layered perovskite A 3 B 2 o 7 low temperature preparation method. Background technique [0002] Ruddlesden-Popper (R-P) layered perovskite is a perovskite-like composite oxide with a layered structure, and its molecular formula can be abbreviated as A n+1 B n o 3n+1 or AO (ABO 3 )n, its basic structure can be considered as a two-dimensional intercalation structure formed by intercalation of rock-salt layer AO into original perovskite. The two-dimensional order makes it have superior thermal stability; at the same time, the rock-salt layer AO containing large cations forms a loose mirror layer, which is conducive to the interlayer transport of oxygen species or ions, giving it superior transport performance. Since 1957, S. N. Ruddlesden and P. Popper first synthesized Sr 3 Ti 2 o 7 Since (S. N. Ruddlesden and P. Popper, Acta Cryst., ...

Claims

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Application Information

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IPC IPC(8): C01G45/12C01G51/00C01G25/00C01G23/00C01G53/00
Inventor 邹国军杜晓蕊王晓来
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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