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Preparation method of uniformly dispersed nano lanthanum oxide

A technology of nano-lanthanum oxide and lanthanum hydroxide, which is applied in the field of controllable preparation of homogeneously dispersed nano-lanthanum oxide powder, can solve problems such as uneven distribution, expensive raw materials, and harsh conditions, and achieve low process cost, good dispersion, and The effect of small particle size

Inactive Publication Date: 2011-08-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method with low cost, simple process, controllable particle size and easy industrial production of nano-rare earth lanthanum oxide, which overcomes the problems of expensive raw materials, high cost, complicated process and harsh conditions in the previous preparation methods, which are not suitable for realization. Large-scale, industrialized and prepared nano-lanthanum oxide has disadvantages such as large particle size and uneven distribution

Method used

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  • Preparation method of uniformly dispersed nano lanthanum oxide
  • Preparation method of uniformly dispersed nano lanthanum oxide
  • Preparation method of uniformly dispersed nano lanthanum oxide

Examples

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Embodiment 1

[0019] Take 1g of carbon black N330 with a particle size of about 10nm as the initial dispersant, add 10g of nitric acid with a concentration of 16mol / L as the carbon black oxidant, heat it to 50°C for 5h, dry and activate it at 120°C for 12h after centrifugal washing, and obtain modified carbon Black N330; 5.4g of La(NO 3 ) 3 ·6H 2 O was dissolved in deionized water to form a 0.1mol / L solution, then 0.54g of modified carbon black N330 was added, and ultrasonically dispersed for 15 minutes to obtain a uniformly dispersed black liquid, which was designated as liquid A; 1.5g of NaOH was dissolved in deionized In water, make a solution of 0.3mol / L, which is recorded as B solution; fully mix A solution and B solution in a rotating liquid film nucleation reactor at room temperature to obtain a black precipitate; transfer the black precipitate into a three-necked flask, Crystallize and grow at ℃ for 4 hours, wash with centrifuge until neutral, dry at 80℃ for 12 hours to obtain the...

Embodiment 2

[0024] Take 1g of carbon black N550 with a particle size of about 15nm as the initial dispersant, add 30g of nitric acid with a concentration of 10mol / L as the carbon black oxidant, heat it to 70°C for 8h, dry and activate it at 140°C for 20h after centrifugal washing, and obtain modified carbon Black N550; 2.26g of LaCl 3 ·7H 2O was dissolved in deionized water to form a 0.05mol / L solution, then 0.15g of modified carbon black N550 was added, and ultrasonically dispersed for 10 minutes to obtain a uniformly dispersed black solution, which was recorded as A solution; 0.75g of NaOH was dissolved in deionized Prepare a solution of 0.15 mol / L in ionic water, and record it as liquid B; fully mix liquid A and liquid B in a rotating liquid film nucleation reactor at room temperature to obtain a black precipitate; transfer the black precipitate into a three-necked flask, and Crystallization and growth at 40°C for 5 hours, centrifugation and washing until Cl-free - , dry at 70°C for ...

Embodiment 3

[0026] Take 1g of carbon black N770 with a particle size of about 55nm as the initial dispersant, add 40g of nitric acid with a concentration of 2mol / L as the carbon black oxidant, heat it to 60°C for 4h, dry and activate it at 150°C for 24h after centrifugal washing, and obtain modified carbon Black N770; add 0.5g of La 2 (SO 4 ) 3 9H 2 O was dissolved in deionized water to form a 0.01mol / L solution, then 0.03g of modified carbon black N770 was added, and ultrasonically dispersed for 5 minutes to obtain a uniformly dispersed black solution, which was recorded as solution A; 0.15g NaOH was dissolved in deionized Prepare a solution of 0.03mol / L in water, which is denoted as liquid B; fully mix liquid A and liquid B in a rotating liquid film nucleation reactor at room temperature to obtain a black precipitate; transfer the black precipitate into a three-necked flask, Crystallization growth under the crystallization conditions for 6h, centrifugal washing to no SO 4 2- , dry ...

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Abstract

The invention relates to a controllable preparation method of uniformly dispersed nano lanthanum oxide powder, belonging to the technical field of preparation of inorganic functional materials. In the preparation method, soluble trivalent lanthanum, sodium hydroxide, nitric acid and carbon black are used as raw materials, a black lanthanum hydroxide precursor is firstly prepared, and then temperature-programmed calcination is prepared to finally obtain the nano lanthanum oxide powder. The process has low cost, is easy to control and is convenient for industrial production, and the particle size of the prepared nano rare earth lanthanum oxide is within a range of 15nm-40nm; the nano rare earth lanthanum oxide has the advantages of small particle size, narrow range, good dispersibility, high purity and the like; in addition, the preparation method is superior to the traditional preparation method, because the traditional preparation method has the defects of expensive raw materials, high cost, complicated process, strict conditions and the like and is not suitable for large-scale and industrial production moreover, lanthanum oxide prepared by the traditional preparation method has the defects of large grain size and nonuniform distribution.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, in particular to a controllable preparation method of homogeneously dispersed nano lanthanum oxide powder. technical background: [0002] Rare earth oxides are more and more widely used in various fields. Nano-rare earth oxide materials have the characteristics of high chemical activity, strong redox ability, and variable coordination numbers. Lanthanum oxide is an important rare earth oxide, which has a wide range of applications in catalysts, solid electrolytes, etc. In particular, it is widely used as a base catalyst in hydrogenation, isomerization, dehydration, and dehydrogenation reactions. Nano La 2 o 3 Small particles, large specific surface area, high activity, with micron La 2 o 3 The properties that it does not have play an important role in many fields such as hydrogen storage materials, luminescent materials, ceramic materials, magnetic m...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y40/00
Inventor 林彦军周永山吴边王桂荣段雪
Owner BEIJING UNIV OF CHEM TECH
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