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Method for producing nano-scale rare earth doping composite oxides sosoloid with low-temperature carbothermic method

A composite oxide, rare earth doping technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of cumbersome steps, difficult to control particle size, etc., achieve high reactivity, short reaction period, reduce Effects of energy consumption and pollution

Inactive Publication Date: 2008-09-24
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation of multi-component oxide solid solution, in the existing literature, is obtained by dissolving various metal oxides with strong acid and then calcining at high temperature, the steps are cumbersome and the particle size is difficult to control

Method used

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  • Method for producing nano-scale rare earth doping composite oxides sosoloid with low-temperature carbothermic method
  • Method for producing nano-scale rare earth doping composite oxides sosoloid with low-temperature carbothermic method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Prepare 0.25M Ca(NO 3 ) 2 , 0.5M Ce(NO 3 ) 3 , 0.625M CaAC 2 Take 15ml of each solution and mix it in a ceramic reactor. Add 15ml of distilled water to further dissolve and mix. Use an electric heating mantle to control the heating temperature to 150℃. The solution changes from sol to gel until self-propagating combustion occurs and releases A large amount of brown gas and fluffy powder are produced. After the gas is dissipated, the powder is collected, that is, the self-combustion precursor powder; weigh an appropriate amount of the precursor powder into a porcelain boat, and calcined in a muffle furnace at 750°C for 2 hours to obtain a calcium oxide-based cerium doped composite Oxide solid solution.

Embodiment 2

[0022] Prepare 0.25M Ca(NO 3 ) 2 , 0.75M La(NO 3 ) 3 , 1.25M CaAC 2 Take 15ml of each solution and mix it in a ceramic reactor. Add 15ml of distilled water to further dissolve and mix. Use an electric heating mantle to control the heating temperature to 140℃. The solution changes from sol to gel until self-propagating combustion occurs and releases A large amount of brown gas produces fluffy powder. After the gas is dissipated, the powder is collected, that is, self-combustion precursor powder; Weigh an appropriate amount of precursor powder into a porcelain boat, calcined in a muffle furnace at 800°C for 1.5 hours to obtain calcium oxide-based lanthanum doping Composite oxide solid solution.

Embodiment 3

[0024] Prepare 0.4M Ca(NO 3 ) 2 , 1.0M Ce(NO 3 ) 3 , 1.0M CaAC 2 Take 15ml of each solution and mix it in a ceramic reactor. Add 15ml of distilled water to further dissolve and mix. Use an electric heating mantle to control the heating temperature to 160℃. The solution changes from sol to gel until self-propagating combustion occurs and releases A large amount of brown gas and fluffy powder are produced. After the gas is dissipated, the powder is collected, that is, self-combustion precursor powder; Weigh an appropriate amount of the precursor powder into a porcelain boat, calcined in a muffle furnace at 900°C for 1 hour to obtain a calcium oxide-based cerium doped composite Oxide solid solution.

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Abstract

The invention relates to a method using a low temperature carbothermic method to prepare a solid solution of nanometer calcium oxide based rare earth mixed with composite oxide. The method has the technical proposal that 0.25M to 0.5M of Ca(NO3)2, 0.5M to 1.0M of rare earth nitrate and 0.625 M to 1.25M of CaAC2 solution are prepared, and the same amount of solution is taken to be well mixed; distilled water is added, and the solution is further dissolved and well mixed; the solution is heated to 140 DEG C to 160 DEG C with an electric jacket, and after self-propagating combustion happens to release large amounts of brown gas and generate fluffy powder, a proper amount of precursor powder is weighted to be put into a porcelain boat; after the proper amount of precursor powder is calcined for 1 to 2 hour(s) at 750 DEG C to 900 DEG C with a muffle furnace, the solid solution of nanometer calcium oxide based rare earth mixed with composite oxide is obtained. In the invention, a new synthetic route and technology is adopted, thereby the method has the advantages of comparatively lower cost, simple technology, mild conditions, short experimental period and time and energy conservation. Simultaneously, utilizing the analysis of a modern instrument can indicate that the synthesized solid solution of nanometer calcium oxide based rare earth mixed with composite oxide is provided with a nanometer structure, and the size is uniform, thereby providing possibility for improving the application in the field of tail gas treatment and environmental friendly plastics.

Description

Technical field [0001] The invention relates to a method for preparing a nano-scale calcium oxide-based rare earth doped composite oxide solid solution by a low-temperature carbothermic reduction method. Background technique: [0002] Calcium oxide has important applications in the environmental and chemical fields. It is widely used in the treatment of solid waste incineration tail gas or flue gas. Under high temperature conditions (600℃), it is an acid gas such as CO. 2 , SO 2 , H 2 S is a good absorbent; Chen Qinghua and others found that calcium oxide-filled environmentally absorbing plastics have good use performance, economic performance and environmental performance, and can also solve the problems of starch-type plastics caused by high water absorption of starch. This type of plastic Environmentally absorbing plastics can adapt to various solid waste treatment methods such as landfill and incineration, and improve the environmentally absorbing performance of plastics. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/04
Inventor 陈庆华许兢钱庆荣肖荔人刘欣萍黄宝铨
Owner FUJIAN NORMAL UNIV
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