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Device and process for preparing nanometer cerium oxide powder in supercritical water medium

A technology of nano-cerium oxide and supercritical water, which is applied in the direction of cerium oxide/cerium hydroxide, rare earth metal oxide/hydroxide, lanthanide oxide/hydroxide, etc., which can solve the problem of high raw material cost and industrial production Difficulty and other issues, to achieve the effect of fast response time, short cycle, and improved particle hardness

Pending Publication Date: 2020-12-22
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of raw materials used in this method is relatively high, and industrial production has certain difficulties.

Method used

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  • Device and process for preparing nanometer cerium oxide powder in supercritical water medium
  • Device and process for preparing nanometer cerium oxide powder in supercritical water medium
  • Device and process for preparing nanometer cerium oxide powder in supercritical water medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of technology that prepares nano cerium oxide powder in supercritical water medium, described technology adopts such as figure 1 The supporting equipment shown, the specific steps are as follows:

[0044] Ce(NO 3 ) 3 ·6H 2 O solution, put the prepared raw materials into the storage tank, set the temperature of the preheater to 120°C, and the temperature of the reactor to 400°C, when the temperature reaches the predetermined value, turn on the plunger pump, and the liquid passes through the preheater After preheating, enter the reaction kettle. When the liquid filling degree in the kettle reaches 20%, stop feeding, turn on the magnetic stirrer, set the speed at 300r / min, open the gas cylinder valve, and set the gas pressure to 23MPa. When the pressure in the kettle reaches 23MPa, that is, the temperature and pressure above the supercritical point of water, close the valves of the gas cylinder and the reactor, and react the raw materials in the closed reactor fo...

Embodiment 2

[0049] A kind of technology that prepares nano cerium oxide powder in supercritical water medium, described technology adopts such as figure 1 For the device shown, the specific steps are as follows:

[0050] Ce(NO 3 ) 3 ·6H 2 O solution, put the prepared raw materials into the storage tank, set the temperature of the preheater to 120°C, and the temperature of the reactor to 450°C, when the temperature reaches the predetermined value, turn on the plunger pump, and the liquid passes through the preheater After preheating, enter the reaction kettle. When the liquid filling degree in the kettle reaches 20%, stop feeding, turn on the magnetic stirrer, set the speed at 300r / min, open the gas cylinder valve, and set the gas pressure to 45MPa. When the pressure in the kettle reaches 45MPa, close the valves of the gas cylinder and the reactor, and react the raw materials in the closed reactor for 60 minutes. After the reaction, the liquid enters the spray dryer through the pipeline...

Embodiment 3

[0054] A kind of technology that prepares nano cerium oxide powder in supercritical water medium, described technology adopts such as figure 1 For the device shown, the specific steps are as follows:

[0055] Ce(NO 3 ) 3 ·6H 2 O solution, put the prepared raw materials into the storage tank, set the temperature of the preheater to 120°C, and the temperature of the reactor to 400°C, when the temperature reaches the predetermined value, turn on the plunger pump, and the liquid passes through the preheater After preheating, enter the reaction kettle. When the liquid filling degree in the kettle reaches 60%, stop feeding, turn on the magnetic stirrer, set the speed at 300r / min, open the gas cylinder valve, and set the gas pressure to 30MPa. The pressure in the kettle reaches 30MPa, close the valve of the gas cylinder and the reactor, and react the raw materials in the closed reactor for 30 minutes. After the reaction, the liquid enters the spray dryer through the pipeline, and ...

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Abstract

The invention provides a device and process for preparing nanometer cerium oxide powder in a supercritical water medium. The device comprises a feeding device, a reaction device and a collecting device, wherein the feeding device comprises a storage barrel; the reaction device comprises a supercritical reaction kettle and a high-pressure gas cylinder, and the high-pressure gas cylinder is connected with the supercritical reaction kettle; and the collection device comprises a spray dryer, a liquid recovery device and a powder collection device. According to the invention, supercritical water oxidation equipment is innovatively designed, so the functions of continuous production, uniform stirring and mixing, and realization of a supercritical state at any filling degree are achieved, and therequirements of one-step collection of products, full recovery of waste gas and waste liquid and zero emission are met. The particle size, morphology and distribution of the prepared nanometer CeO2 powder can be controlled by controlling the concentration of an aqueous Ce(NO3)3.6H2O solution, reaction temperature and reaction pressure; and the prepared powder is small in particle size, high in hardness, narrow in particle size distribution and good in dispersity.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a device and a process for preparing nano cerium oxide powder in a supercritical water medium. Background technique [0002] Nano-cerium oxide has excellent physical and chemical properties, and is widely used in polishing materials, automotive exhaust purification catalytic materials, photocatalysts, anti-corrosion coatings, gas sensors, fuel cells, etc. At present, the preparation process of nano-cerium oxide is complex, and the development of a new method for preparing nano-cerium oxide has important scientific significance and application value. [0003] There are various preparation methods for nano-cerium oxide, and each has its own advantages and disadvantages. Ball milling method in the preparation of CeO 2 Nanomaterials have the advantages of simple preparation process, low production cost, and easy industrialization. The current ball milling method ha...

Claims

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Application Information

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IPC IPC(8): C01F17/235C01F17/10
CPCC01F17/235C01F17/10C01P2004/03C01P2004/64Y02P20/54
Inventor 向敏李科包中华
Owner NAT UNIV OF DEFENSE TECH
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