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A spherical lanthanum oxide

A lanthanum oxide, spherical technology, applied in rare earth metal oxides/hydroxides, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of cumbersome operation methods, low catalytic efficiency of motor vehicle exhaust, etc., and achieve uniform product morphology, Reduce nucleation and growth rate, good dispersion effect

Active Publication Date: 2017-11-14
GUANGDONG UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The above method requires two hydrothermal synthesis, the operation method is cumbersome, and the specific surface area of ​​the obtained lanthanum oxide microspheres is lower than 1m after being calcined at 1000°C. 2 / g, the catalytic efficiency of motor vehicle exhaust is also low

Method used

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Embodiment 1

[0029] A kind of spherical lanthanum oxide is prepared, comprising the following steps:

[0030] (1) Weigh La(NO 3 ) 3 ·6H 2 O was dissolved in the mixture of deionized water and ethylene glycol, stirred until it was completely dissolved, then added polyvinylpyrrolidone (PVP, molecular weight M=58000), stirred for about 1 hour to obtain a transparent and clear solution, added propionic acid, and continued to stir 0.5h;

[0031] (2) Transfer the transparent and clear mixed solution into a 100ml polytetrafluoroethylene lining, put it into a stainless steel reactor, and react at 200°C for 200min;

[0032] (3) After the reactor was cooled to room temperature, the product was centrifuged at a speed of 10000r / min for 5min to obtain a precipitate, which was washed alternately with deionized water and ethanol for 3 times, and then dried at 80°C for 12h to obtain lanthanum oxide.

[0033] Test preparation: (1) Dry the lanthanum oxide prepared in Example 1, and grind it into a fine ...

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Abstract

The invention discloses a spherical lanthanum oxide. The average particle size of spherical lanthanum oxide is 150 nm-1.2 mum, the specific surface area after roasting at 1000 DEG C is 1-7 m<2> / g, and the specific surface area after roasting at 500 DEG C is 120-144 m<2> / g. The invention also discloses a preparation method of the spherical lanthanum oxide, and the method includes the following steps: (1) mixing lanthanum salt, hydrous ethylene glycol, polyvinylpyrrolidone, and short-chain organic acid, stirring the mixture, dissolving the mixture, and performing a hydrothermal reaction; and (2) subjecting the mixture to the reaction for 1-8 hours at 160-240 DEG C, cooling the mixture to obtain the precipitate, and drying the precipitate to obtain the spherical lanthanum oxide. The lanthanum oxide prepared by the invention is spherical, has uniform morphology, good degree of crystallization, good dispersibility, high heat stability, and big specific surface area, and is suitable for the application on the motor vehicle exhaust.

Description

technical field [0001] The invention belongs to the field of synthesis of micro-nano materials, and in particular relates to spherical lanthanum oxide. Background technique [0002] Rare earth elements have unique 4f electron orbits, and the movement of electrons in the orbits makes rare earth elements have optical, electrical and magnetic properties different from other elements. As one of the light rare earth oxides, lanthanum oxide has important applications in precision optical glass, fluorescent materials, solid electrolyte batteries, ceramic capacitors and gas sensors. In addition, lanthanum oxide is also a good catalytic material and is widely used in the field of heterogeneous catalysis. In motor vehicle exhaust purification catalysts, both lanthanum oxide and cerium oxide can be used as additives to increase the dispersion of noble metals, inhibit the growth of noble metal grains, and improve catalytic activity; lanthanum-based perovskite oxides produce oxygen vaca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
CPCC01F17/206C01P2002/72C01P2004/03C01P2004/32C01P2004/62
Inventor 余林杨润农赵向云范群萧剑鸣杨晓波
Owner GUANGDONG UNIV OF TECH
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