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Preparation method and application of cerium dioxide with different defect degrees

A technology of ceria and defects, which is applied in the field of ceria preparation, can solve the problems of limitation, easy agglomeration, and easy recombination of photogenerated carriers, and achieve the effects of low cost, simple operation, and easy control of reaction conditions

Pending Publication Date: 2021-11-23
安徽工业技术创新研究院六安院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But CeO 2 There are also problems such as easy recombination and easy reunion of photogenerated carriers, which limit the improvement of its photo(thermal) catalytic performance.

Method used

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  • Preparation method and application of cerium dioxide with different defect degrees
  • Preparation method and application of cerium dioxide with different defect degrees
  • Preparation method and application of cerium dioxide with different defect degrees

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Experimental program
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Effect test

preparation example Construction

[0025] Method for preparing cerium oxide having different defects, such as Figure 1 - Figure 4 As shown, including the following steps:

[0026] A. Weigh 1.736 g of hexahydrate is placed in a beaker, add 20 ml of deionized water stir stock, weigh 0.0064 to 0.0067 g of trisodium phosphate is placed in a beaker, and 30 ml of deionized water stir stock is added;

[0027] B, pour a sufficiently mixed nitrate solution in the sodium phosphate solution, adding a magnetic aging for 30 min, and then add 10 mL of deionized water during aging. After the age is completed, the temperature is transferred to the reaction kettle, 170 ° C constant temperature 12h, the resulting precipitate Washing CEO 2 powder;

[0028] C, the CEO obtained 2 Powder is placed in PECVD, directly acting on the dry powder surface of 30 to 90 min, flow rate of 25 to 100 sccm, power 100W ~ 200W, and obtain a uniform uniform CEO with certain defects after discharging 2 catalyst.

[0029] Treatment of CEO with plasma flow...

Embodiment 1

[0032] D, weigh 100mg after processing CEO 2 Placed in the polytetrafluoroethylene liner, take 15 ml of methanol, add a magnet, and install high temperature and high pressure reactor, use CO 2 Gas purge 5min, then close the air valve, and turn off the intake valve after boiling to 4 MPa, turn on the temperature control and magnetic stirring, and the ring lamp, the xenon lamp working current is 14.5a, and the stage is raised to 140 ° C. The pressure of the kettle was finally raised to 7.5 MPa, and after 6 h, the cooling and lowering removal solution was detected by FID chromatography, such as Figure 5 Indicated.

[0033] In the 100mg CEO processed without step C defective 2 With 15 mL of methanol, the DMC content of the product was 0.33%.

Embodiment 2

[0035] It is called the CEO2 powder 50mg after step B, and placed in the center of the PECVD ring, and the N2 is passed to produce a nitrogen plasma flow directly to the CEO. 2 Surface 30 ~ 90min, flow rate 25 ~ 100Sccm, power 100W ~ 200W, after the discharge is completed, it obtains a uniform uniform CEO with certain defects. 2 The catalyst, finally produced DMC through step D photothermal catalysis. Meethanol conversion of the sample under different processing times Figure 5 .

[0036] It can be seen that the methanol conversion will increase as the power (time, flow rate) increases.

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Abstract

The invention discloses a preparation method of a catalyst for dimethyl carbonate synthesis, which comprises the following steps: taking a cerium source cerium nitrate hexahydrate, combining the cerium source cerium nitrate hexahydrate with a pH regulator trisodium phosphate, and carrying out hydrothermal synthesis to obtain octahedral CeO2; using a plasma enhanced chemical vapor deposition (PECVD) discharge device for generating plasma flow, directly applying the plasma flow on the surface of the dried CeO2 powder, and obtaining uniformly dispersed CeO2 nanoparticles with different defect degrees after discharge is completed under different parameters; and mixing the treated CeO2 catalyst with methanol, and carrying out photo-thermal catalysis on synthesis of DMC under the conditions of specific pressure, temperature and illumination. The method has the advantages of easily available raw materials, simple operation, easily controllable reaction conditions, low cost, no hazardous waste gas in the reaction process, and environmental protection.

Description

Technical field [0001] The present invention relates to CeO 2 In the field of preparation, specifically a preparation method and application of cerium dioxide with different defect levels. Background technology [0002] With the rapid development of economy and science and technology, energy problems and environmental problems are becoming increasingly severe. At the same time, due to the increasing awareness of personal environmental crisis, people's dependence on and demand for non-toxic and environmentally friendly green chemicals continues to rise. Among them, dimethyl carbonate, as a non-toxic and easily degradable non-polar protic solvent, is widely used in various industries and has become a recognized harmless chemical and organic green solvent in the chemical industry. [0003] Most of the traditional production processes of dimethyl carbonate are about to be eliminated due to backward technology and polluting raw materials and products. And CO 2 The one-step dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C01F17/235C01F17/10C07C68/04C07C69/96
CPCB01J23/10C01F17/235C01F17/10C07C68/04C01P2002/72C01P2004/03C01P2002/01C07C69/96Y02P20/141
Inventor 王奇吕玲玲孙松
Owner 安徽工业技术创新研究院六安院
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