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Oil-soluble monodisperse nano cerium dioxide catalyst as well as preparation method and application thereof

A nano-ceria, monodisperse technology, used in molecular sieve catalysts, ceria/ceria hydroxide, physical/chemical process catalysts, etc., can solve the problems of low sedimentation rate, incomplete stable dispersion, low particle solid content, etc.

Active Publication Date: 2020-07-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: one more step of hydrothermal process is needed to prepare ceria nanocrystals with good crystallinity; ceria nanoparticles are hydrophilic, while catalytic cracking, steam cracking, catalytic cracking and other processes require Oil-soluble ceria particles; the particle size is relatively large, between 50 and 600nm; the solid content of the particles in the dispersion is not high, and the solid content of ceria in the dispersions given in the examples given are all less than 5wt.%. The dispersion is translucent, although it can maintain a low sedimentation rate for a long time, it still cannot be completely dispersed stably

Method used

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  • Oil-soluble monodisperse nano cerium dioxide catalyst as well as preparation method and application thereof
  • Oil-soluble monodisperse nano cerium dioxide catalyst as well as preparation method and application thereof
  • Oil-soluble monodisperse nano cerium dioxide catalyst as well as preparation method and application thereof

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preparation example Construction

[0064] As another aspect of the present invention, a kind of preparation method of oil-soluble monodisperse nano ceria catalyst of the present invention comprises the steps:

[0065] 1) taking a mixture of an organic solvent and water as a solvent, adding a cerium salt and a doped metal salt to it to prepare a salt solution;

[0066] 2) taking a mixture of an organic solvent and water as a solvent, adding a surfactant to prepare a surfactant solution;

[0067] 3) taking a mixture of an organic solvent and water as a solvent, adding a hydrolysis accelerator to it to prepare a hydrolysis accelerator solution;

[0068] 4) mixing the salt solution and the hydrolysis accelerator solution to obtain a reaction solution;

[0069] 5) adding an oxidizing agent to the reaction solution and mixing to carry out an oxidation reaction until the reaction solution turns yellow;

[0070] 6) Adding the surfactant solution to the discolored reaction solution, mixing and modifying it, and aging ...

Embodiment 1

[0098] A method for preparing an oil-soluble monodisperse nanometer ceria catalyst, comprising the following steps:

[0099] 1) Dissolve 2.50g cerium chloride heptahydrate and 0.03g cobalt nitrate hexahydrate in a mixture of 50ml ethanol and 50ml deionized water to prepare a salt solution;

[0100] 2) Dissolving 0.2 g of sodium dodecylbenzenesulfonate in 20 ml of deionized water to obtain a sodium dodecylbenzenesulfonate solution;

[0101] 3) Dissolve 6ml of ethylenediamine in 50ml of methanol to obtain an ethylenediamine solution;

[0102] 4) Add the salt solution dropwise into the ethylenediamine solution, control the reaction temperature to 40°C, and stir at a rate of 500r / min to obtain a reaction solution;

[0103] 5) Dissolve 1.5ml, 30wt.% hydrogen peroxide aqueous solution in 30ml of deionized water, dropwise add to the reaction solution, control the oxidation reaction temperature to 50°C, stir at 500r / min, the reaction solution turns yellow;

[0104] 6) Pour the sodiu...

Embodiment 2

[0107] A method for preparing an oil-soluble monodisperse nanometer ceria catalyst, comprising the following steps:

[0108] 1) 3.88g cerium sulfate tetrahydrate and 0.016g ferrous chloride tetrahydrate were dissolved in a mixture of 30ml acetic acid and 80ml deionized water to prepare a salt solution;

[0109] 2) 5.40 g of myristic acid was dissolved in 25 ml of ethanol to obtain a myristic acid solution;

[0110] 3) 12.33g of sodium acetate was dissolved in 55ml of deionized water to obtain a sodium acetate solution;

[0111] 4) Pour the ethylenediamine solution into the salt solution, control the reaction temperature to 70°C, and stir at a rate of 1000r / min to obtain a reaction solution;

[0112] 5) Dissolve 1.5ml, 30wt.% hydrogen peroxide aqueous solution in 30ml of deionized water, dropwise add to the reaction solution, control the oxidation reaction temperature to 70°C, stir at 500r / min, the reaction solution turns yellow;

[0113] 6) Pour the myristic acid solution in...

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Abstract

The invention discloses an oil-soluble monodisperse nano cerium dioxide catalyst as well as a preparation method and application thereof. The cerium dioxide catalyst comprises nano cerium dioxide particles and a low-polarity liquid-phase medium, wherein the surfaces of the nano cerium dioxide particles are coated with a surfactant layer, and the nano cerium dioxide particles coated with the surfactant layer are uniformly dispersed in a low-polarity liquid-phase medium to form a transparent dispersion. The solid content of the transparent dispersion of the nano cerium dioxide catalyst providedby the invention is 5wt.%-60wt.%; the cerium dioxide crystal is small in particle size, and the one-dimensional size of the cerium dioxide crystal is 1-10 nm; monodispersity is achieved, particle sizedistribution is uniform, and dispersity is good; the product has high transmittance, high purity and high stability, and is still transparent and free of sedimentation after standing for more than orequal to 6 months.

Description

technical field [0001] The invention relates to the technical field of nano catalysts; more specifically, it relates to an oil-soluble monodisperse nano ceria catalyst, a preparation method and an application. Background technique [0002] Ce due to its special 4f 1 Valence electron structure (4f 1 5d 1 6s 2 ) has Ce 3+ (Ce 2 o 3 ) and Ce 4+ (CeO 2 ) two oxidation states, and the two valence states can be flexibly switched under different oxygen atmospheres [Ce 3+ (4f 1 )-e→Ce 4+ (4f 0 ) and Ce 4+ +e → Ce 3+ ], therefore, cerium oxide has a good oxygen storage capacity and is widely used in the field of catalysis. Doping ceria with transition metals, noble metals, rare earth metals, alkaline earth metals and alkali metals as heterogeneous metal ions can stabilize the cubic fluorite structure of ceria, further improve its oxygen storage function, and improve the high temperature stability and sintering resistance of the catalyst ability, and then significantly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J29/00B82Y40/00C01F17/235
CPCB01J21/063B01J29/00B82Y40/00C01P2004/04C01P2004/64C01P2004/80
Inventor 王洁欣夏怡陈建峰杜金涛
Owner BEIJING UNIV OF CHEM TECH
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