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Method of producing ultra-fine perovskite type LaFeO*, LaMnO*, LaNiO*

A perovskite-type, ultra-fine calcium technology, applied in chemical instruments and methods, inorganic chemistry, nickel compounds, etc., can solve problems such as uneven distribution, small specific surface area, large particle size, etc., and achieve easy industrialization, specific surface area Great effect of improving physical and chemical properties

Inactive Publication Date: 2008-05-07
ZHONGBEI UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The present invention overcomes the LaFeO synthesized by the current gel combustion synthesis method 3 , LaMnO 3 , LaNiO 3 It has the disadvantages of large particle size, small specific surface area, and uneven distribution. The perovskite-type ultrafine LaFeO was prepared by the stearic acid complex gel combustion method. 3 , LaMnO 3 , LaNiO 3

Method used

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  • Method of producing ultra-fine perovskite type LaFeO*, LaMnO*, LaNiO*
  • Method of producing ultra-fine perovskite type LaFeO*, LaMnO*, LaNiO*
  • Method of producing ultra-fine perovskite type LaFeO*, LaMnO*, LaNiO*

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Embodiment approach 1

[0027] Weigh lanthanum nitrate, ferric nitrate and stearic acid at a molar ratio of 1:1:10, respectively. Under the condition of heating in an oil bath, first dissolve the stearic acid, and under constant temperature magnetic stirring, dissolve the solids of lanthanum nitrate and iron nitrate in the molten stearic acid, control the temperature at 116°C, and react for 6.0 hours to form a gel. The gel was placed in a 300°C muffle furnace and heated to burn it. Can directly obtain perovskite ultrafine powder LaFeO 3 . The XRD and morphology of the powder are shown in figure 1 with figure 2

Embodiment approach 2

[0029] Weigh lanthanum nitrate, ferric nitrate, and stearic acid at a molar ratio of 1:1:8, respectively. Under the condition of heating in an oil bath, first dissolve the stearic acid, and under constant temperature magnetic stirring, dissolve the solids of lanthanum nitrate and iron nitrate in the molten stearic acid, control the temperature at 114°C, and react for 5.0 hours to form a gel. The gel was placed in a 300°C muffle furnace and heated to burn it. Can directly obtain perovskite ultrafine powder LaFeO 3 . Particle specific surface area and morphology are shown in Table 1

[0030] 2. LaMnO 3 preparation of

[0031] Embodiment 1

[0032] Weigh lanthanum nitrate, manganese chloride, and stearic acid at a molar ratio of 1:1:10, respectively. Under the condition of heating in an oil bath, first dissolve the stearic acid, and under constant temperature magnetic stirring, dissolve the solids of lanthanum nitrate and manganese chloride in the molten stearic acid, contr...

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Abstract

The invention relates to a preparation method for super fine perovskite LaFeO3, LaMnO3 and LaNiO3 with a stearic acid gel burning method. The invention has technical proposal that (1) lanthanum nitrate and ferric nitrate and stearic acid are weighted with mol rate of 1:1:(7 to 10); lanthanum nitrate and ferric nitrate solid are smelted into the meltdown stearic acid; and the temperature is controlled by ranging from 114 DEG C to 125 DEG C for reacting for higher than 5 hours for gelling; and then the gel is arranged inside a muffle furnace having temperature range from 300 DEG C to 500 DEGC for burning so as to obtain LaFeO3 powder; (2) lanthanum nitrate, manganese chloride and stearic acid are weighted with a mol rate of 1:1:(7 to 10); lanthanum nitrate and manganese chloride solid are smelted into the meltdown stearic acid; and the temperature is controlled by ranging from 104 DEG C to 118 DEG C for reacting for higher than 6 hours for gelling; and then the gel is arranged inside a muffle furnace having temperature ranging from 300 DEG C to 500 DEGC for burning, so as to obtain LaMnO3 powder; (3) lanthanum nitrate, nickel nitrate and stearic acid are weighted with a mol rate of 1:1:(7 to 10); lanthanum nitrate and nickel nitrate solid are smelted into the meltdown stearic acid; and the temperature is controlled by ranging from 102 DEG C to 109 DEG C for reacting for higher than 6 hours for gelling; and then the gel is arranged inside a muffle furnace having temperature ranging from 300 DEG C to 500 DEGC; and the burned powder is calcined for one hour in different temperatures higher than 758 DEG C, so as to obtain LaNiO3 with different granularity sizes.

Description

technical field [0001] The invention belongs to perovskite ultrafine powder LaFeO 3 , LaMnO 3 , LaNiO 3 The field of preparation technology, specifically the preparation of perovskite ultrafine powder LaFeO by stearic acid gel combustion method 3 , LaMnO 3 , LaNiO 3 . Background technique [0002] LaFeO 3 , LaMnO 3 , LaNiO 3 It belongs to perovskite type rare earth composite oxide, which can be used as catalyst for environmental pollution treatment, oxygen sensor, solid fuel cell, etc. Most of its properties depend on the production method of the powder. So a good synthesis method can often greatly change its physical and chemical properties. [0003] Preparation of LaFeO 3 , LaMnO 3 , LaNiO 3 The method usually adopts high temperature solid phase method, chemical co-precipitation method, sol-gel method, hydrothermal synthesis method and low temperature combustion synthesis method. The samples prepared by the high-temperature solid-phase method have excellent p...

Claims

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Application Information

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IPC IPC(8): C01G49/00C01G45/12C01G53/00
Inventor 卫芝贤李延斌姚根有董亚文刘乘风高艳丽刘海燕
Owner ZHONGBEI UNIV
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