Hierarchic porous La2Zr2O7 ceramic and preparation method thereof

A hierarchical porous and ceramic technology, which is applied to ceramic products, other household utensils, household utensils, etc., can solve the problem of hierarchical porous multi-element rare earth compound ceramics, etc., achieve uniform and stable structure, no corrosion of equipment, and improve high temperature stability.

Active Publication Date: 2014-07-02
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Preparation of Hierarchical Porous Oxide TiO by Sol-Gel-Phase Separation Method 2 , ZrO 2 , YAG, mullite, and cordierite have been reported, but there are few reports on the preparation of hierarchical porous multi-element rare earth compound ceramics, and there is no report on the hierarchical porous La 2 Zr 2 o 7 Literature reports on ceramics

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  • Hierarchic porous La2Zr2O7 ceramic and preparation method thereof
  • Hierarchic porous La2Zr2O7 ceramic and preparation method thereof
  • Hierarchic porous La2Zr2O7 ceramic and preparation method thereof

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Embodiment 1

[0032] A kind of hierarchical porous La of the present invention 2 Zr 2 o 7 ceramic, the graded porous La 2 Zr 2 o 7 Ceramics are binary oxide hierarchical porous ceramics with micro-mesopores and macro-pores, in which the diameter of micro-mesopores is 1nm-4nm, the diameter of macropores is 1μm-3μm, and the specific surface area is 149.94m 2 / g, no phase change after heat treatment at 1600°C in air, no corrosion in concentrated nitric acid.

[0033] A kind of hierarchical porous La of above-mentioned present embodiment 2 Zr 2 o 7 The preparation method of pottery, comprises the following steps:

[0034] (1) Preparation of precursor solution: ZrOCl 2 ·8H 2 O, La(NO 3 ) 3 ·6H 2 O was slowly added to a mixed solvent composed of deionized water and ethanol, and stirred continuously until dissolved to obtain a precursor solution, in which ZrOCl 2 ·8H 2 O:La(NO 3 ) 3 ·6H 2 The molar ratio of O: deionized water: ethanol is 1:1:50:20.

[0035] (2) Prepare the sol: ...

Embodiment 2

[0041] A kind of hierarchical porous La of the present invention 2 Zr 2 o 7 ceramic, the graded porous La 2 Zr 2 o 7 Ceramics are binary oxide hierarchical porous ceramics with micro-mesopores and macro-pores, in which the pore size of the micro-mesopores is 1nm-3nm, the pore size of the macro-pores is 1μm-5μm, and the specific surface area is 118.81m 2 / g, no phase change after heat treatment at 1600°C in air, no corrosion in concentrated nitric acid.

[0042] A kind of hierarchical porous La of above-mentioned present embodiment 2 Zr 2 o 7 The preparation method of pottery, comprises the following steps:

[0043] (1) Preparation of precursor solution: Zr(NO 3 ) 4 ·5H 2 O, La(NO 3 ) 3 ·6H 2 O was slowly added into a mixed solvent composed of deionized water and ethanol, and stirred continuously until dissolved to obtain a precursor solution, in which Zr(NO 3 ) 4 ·5H 2 O:La(NO 3 ) 3 ·6H 2 The molar ratio of O: deionized water: ethanol is 1:1:80:40.

[0044...

Embodiment 3

[0050] A kind of hierarchical porous La of the present invention 2 Zr 2 o 7 ceramic, the graded porous La 2 Zr 2 o 7 Ceramics are binary oxide hierarchical porous ceramics with micro-mesopores and macro-pores, in which the diameter of micro-mesopores is 2nm-5nm, the diameter of macropores is 0.5μm-2μm, and the specific surface area is 43.05m 2 / g, no phase change after heat treatment at 1600°C in air, no corrosion in concentrated nitric acid.

[0051] A kind of hierarchical porous La of above-mentioned present implementation 2 Zr 2 o 7 The preparation method of pottery, comprises the following steps:

[0052] (1) Preparation of precursor solution: ZrOCl 2 ·8H 2 O, LaCl 3 ·6H 2 O was slowly added to a mixed solvent composed of deionized water and ethanol, and stirred continuously until dissolved to obtain a precursor solution, in which ZrOCl 2 ·8H 2 O: LaCl 3 ·6H 2 The molar ratio of O: deionized water: ethanol is 1:1:10:10.

[0053] (2) Preparation of sol: Stir ...

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Abstract

The invention discloses hierarchic porous La2Zr2O7 ceramic and a preparation method thereof. The hierarchic porous La2Zr2O7 ceramic comprises micro-mesoporous and macro-pore binary oxides, wherein the aperture of the micro-mesopores is 1-5nm; the aperture of the micro-pores is 0.5-5mu m; the specific surface area is 43-150m<2>/g. The preparation method comprises the following five steps: preparing a precursor solution; preparing sol and gel, ageing, drying and roasting at a high temperature. The preparation method disclosed by the invention has the advantages of low cost, low energy consumption, simple process, no corrosion to equipment, no pollution to the environment and the like, and the prepared hierarchic porous La2Zr2O7 ceramic has the characteristics of high specific surface area, stable structure, no phase change between room temperature and the melting point, good high-thermal resistance, sintering resistance, vapor resistance and resistance to strong acid corrosion, and the like, and is applicable to the fields such as high-temperature catalysis, combustion and chemical separation.

Description

technical field [0001] The invention relates to a binary oxide porous ceramic and a preparation method thereof, in particular to a hierarchically porous La 2 Zr 2 o 7 Ceramics and methods of making them. Background technique [0002] Hierarchical porous ceramics usually refer to oxide materials with both macropores and micro / mesopores in the structure, where the macropores provide mass transfer channels, the interconnected macropore framework provides chemical and mechanical stability, and the micro / mesopores provide high The specific surface area enables functional applications. The hierarchical porous structure combines the advantages of pores of different scales, and has the advantages of high accessibility, fast gas / liquid flow transmission, high selectivity, high absorption / release rate, fast thermal cycle, high chemical / mechanical stability, and high volume utilization. , has broad application prospects in the fields of catalyst, chemical separation and environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/50C04B35/624
Inventor 李伟王生学王松陈朝辉
Owner NAT UNIV OF DEFENSE TECH
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