Method for preparing porous lanthanum zirconate block

A technology for lanthanum zirconate and porous blocks, which is applied in ceramic products, applications, household appliances, etc., can solve the problems that the preparation method of lanthanum zirconate porous blocks has not been reported in patents, etc., and achieves low price, simple process, and mild reaction conditions Effect

Active Publication Date: 2015-04-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Method for preparing porous lanthanum zirconate block
  • Method for preparing porous lanthanum zirconate block
  • Method for preparing porous lanthanum zirconate block

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Embodiment 1

[0032] Embodiment 1. A method for preparing a porous lanthanum zirconate block. The zirconium inorganic salt is selected from zirconium oxychloride, the lanthanum inorganic salt is selected from lanthanum chloride, propylene oxide (PO) is used as a gel accelerator, and polyoxyethylene is used as a phase separation agent. Inducer, formamide is a drying control chemical additive, the surface modifier solution is an ethanol solution of ethyl orthosilicate (the volume fraction of ethyl orthosilicate is 20%), and the low surface tension solvent is dehydrated alcohol; wherein each substance The molar ratio of is as follows:

[0033] Zirconium oxychloride: lanthanum chloride: polyoxyethylene: formamide: propylene oxide = 1:0.8:0.0002:0.5:1;

[0034] Then proceed to the following steps in sequence:

[0035] 1) Dissolve zirconium oxychloride, lanthanum chloride and polyoxyethylene in an alcohol-water solvent, and stir magnetically for 3 hours to obtain a transparent solution; the alco...

Embodiment 2

[0041] Embodiment 2, a preparation method of a lanthanum zirconate porous block, the zirconium inorganic salt is selected from zirconyl nitrate, the lanthanum inorganic salt is selected from lanthanum nitrate, propylene oxide is used as a gel accelerator, and polyvinylpyrrolidone (PVP) is used as a phase separation inducer agent, N-methylformamide is a drying control chemical additive, the surface modifier solution is an ethanol solution of trimethylchlorosilane (the volume fraction of trimethylchlorosilane is 15%), and the low surface tension solvent is cyclohexane; Wherein the molar ratio of each substance is as follows:

[0042]Zirconyl nitrate: lanthanum nitrate: polyvinylpyrrolidone: N-methylformamide: propylene oxide = 1:1.2:0.0005:0.9:1.4.

[0043] Then proceed to the following steps in sequence:

[0044] 1) Dissolving zirconium oxynitrate, lanthanum nitrate and polyvinylpyrrolidone in an alcohol-water solvent, and magnetically stirring for 4 hours to a transparent sol...

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Abstract

The invention discloses a method for preparing a porous lanthanum zirconate block. The method comprises the following steps: at room temperature, dissolving inorganic salt of zirconium, inorganic salt of lanthanum and a phase separation inducer in a solvent and stirring until a transparent and clarified solution is obtained; adding a drying control chemical additive and stirring; adding a gel accelerator and stirring to obtain a homogeneous solution; placing the homogeneous solution into a sealed container and standing for 10-30 minutes at 30 DEG C-80 DEG C to obtain wet gel; aging the wet gel for 12-24 hours at 35-80 DEG C, firstly cleaning the wet gel with a solvent with a low surface tension and then soaking the wet gel with a surface modifier solution, and finally cleaning with the solvent with the low surface tension; drying the cleaned wet gel for 24-72 hours at 30-90 DEG C; and then carrying out heat treatment on the dried wet gel for 2-4 hours at 400-1300 DEG C to obtain the porous lanthanum zirconate block. The porous lanthanum zirconate block, which is prepared by the method, has the characteristics of co-continuous macroporous structure, high porosity, centralized distribution of pore sizes and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation and sol-gel method, and specifically relates to a method for preparing a lanthanum zirconate porous block by using zirconium and lanthanum inorganic salts as precursors. Background technique [0002] Lanthanum zirconate belongs to the pyrochlore structure, which is very similar to the fluorite structure. To a certain extent, it can be considered as the anion-deficient fluorite structure. For undoped lanthanum zirconate, the oxygen ion vacancies are ordered, and some oxygen ions can leave their own lattice positions to occupy hole positions, resulting in ion conduction. It is an open structure that can increase the disorder of ion arrangement in the structure by doping with other ions, provide holes for migration of oxygen ions and protons, or increase the concentration of holes, thereby improving ion conductivity. It has different carrier conductivity, catalytic combustion ...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/48C04B35/50C04B35/624
Inventor 郭兴忠宋杰杨辉蔡晓波
Owner ZHEJIANG UNIV
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