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Preparation method and application of efficient photocatalytic material PCN-222-Zn for reducing CO2 into formic acid

A technology of PCN-222 and pcn-222-zn, which is applied in the field of preparation of high-efficiency photocatalytic material PCN-222-Zn, can solve the problems of increasing practical application costs, low catalytic efficiency, and difficult separation, and reduce the difficulty of subsequent processing , improve the photocatalytic efficiency, and facilitate the promotion and application of the effect

Pending Publication Date: 2020-11-10
HUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current photocatalytic reduction of CO 2 The industrial application of the technology is still in the development stage, and there are many technical problems that cannot be solved. For example, most inorganic semiconductor catalysts have a large band gap, and it is impossible to use visible light to stabilize the molecular structure of CO 2 Reduction, even if the reduction can be achieved, the subsequent separation is very difficult due to the variety of products produced by the reduction reaction, and the carbon-containing energy is mixed in it.
The most important thing is that the existing inorganic semiconductor catalysts have low catalytic efficiency, and most reduction reactions need to be carried out in organic solvents, and adding organic solvents as sacrificial agents will undoubtedly increase the cost of practical applications, and to a large extent Limit the popularization and application of reduction technology

Method used

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  • Preparation method and application of efficient photocatalytic material PCN-222-Zn for reducing CO2 into formic acid
  • Preparation method and application of efficient photocatalytic material PCN-222-Zn for reducing CO2 into formic acid
  • Preparation method and application of efficient photocatalytic material PCN-222-Zn for reducing CO2 into formic acid

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Experimental program
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Effect test

Embodiment 1

[0030] This embodiment provides a CO reduction 2 It is the preparation method of the efficient photocatalytic material PCN-222-Zn of formic acid, and described preparation method comprises the following steps:

[0031] a. Weigh an appropriate amount of ZnCl 2 The powder was added into the mixed solution, and after being ultrasonically dissolved at 50° C. for 10 minutes, an appropriate amount of pure-phase PCN-222 crystal was added, and stirred at room temperature for 50 minutes to obtain a mixed solution.

[0032] Wherein, the mixed solution in step a includes DMF and 2,6-lutidine, and the volume ratio of the 2,6-lutidine to DMF is 1:5. while ZnCl 2 The molar concentration of the powder in the mixed solution is 0.0167mmol / mL; the mass concentration of the pure phase PCN-222 crystal in the mixed solution is 4.17mg / mL.

[0033] b. Then transfer the mixed solution in step a to a hydrothermal reactor, and react at 150° C. for 12 hours.

[0034] c. Utilize HCl to acidify the mi...

Embodiment 2

[0043] This embodiment provides a CO reduction 2 It is the preparation method of the efficient photocatalytic material PCN-222-Zn of formic acid, and described preparation method comprises the following steps:

[0044] a. Weigh an appropriate amount of ZnCl 2 The powder was added into the mixed solution, and after being ultrasonically dissolved at 50° C. for 10 minutes, an appropriate amount of pure-phase PCN-222 crystal was added, and stirred at room temperature for 50 minutes to obtain a mixed solution.

[0045] Wherein, the mixed solution in step a includes DMF and 2,6-lutidine, and the volume ratio of the 2,6-lutidine to DMF is 1:5. while ZnCl 2 The molar concentration of the powder in the mixed solution is 0.0125mmol / mL; the mass concentration of the pure phase PCN-222 crystal in the mixed solution is 4.8mg / mL.

[0046] b. Then transfer the mixed solution in step a to a hydrothermal reactor, and react at 150° C. for 12 hours.

[0047] c. Utilize HCl to acidify the mix...

Embodiment 3

[0052] This embodiment provides a CO reduction 2 It is the preparation method of the efficient photocatalytic material PCN-222-Zn of formic acid, and described preparation method comprises the following steps:

[0053] a. Weigh an appropriate amount of ZnCl 2 The powder was added into the mixed solution, ultrasonically dissolved at 40° C. for 15 minutes, then an appropriate amount of pure phase PCN-222 crystals was added, and stirred at room temperature for 30 minutes to obtain a mixed solution.

[0054] Wherein, the mixed solution in step a includes DMF and 2,6-lutidine, and the volume ratio of the 2,6-lutidine to DMF is 0.8:4.5. while ZnCl 2 The molar concentration of the powder in the mixed solution is 0.007mmol / mL; the mass concentration of the pure phase PCN-222 crystal in the mixed solution is 3.6mg / mL.

[0055] b. Then transfer the mixed solution in step a to a hydrothermal reactor, and react at 140° C. for 14 hours.

[0056] c. Utilize HCl to acidify the mixed liqu...

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Abstract

The invention relates to a preparation method of a high-efficiency photocatalytic material PCN-222-Zn for reducing CO2 into formic acid, which comprises the following steps: a, weighing a proper amount of ZnCl2 powder, adding the ZnCl2 powder into a mixed solution, dissolving the materials uniformly, and adding a proper amount of pure-phase PCN-222 crystal to obtain a mixed solution; b, transferring the mixed solution obtained in the step a into a hydrothermal reaction kettle, and reacting for 10-14 hours; c, carrying out acidification treatment on the mixed liquid by using an acidic compoundto remove metal ions except Zn 2+; and d, cooling the acidified mixed solution in the step c to room temperature, carrying out centrifuging, washing and drying treatment to obtain the PCN-222-Zn target product. The catalyst product can reduce CO2 into formic acid, has formic acid selectivity as high as 98% and is remarkable in catalytic effect.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and photocatalysis, in particular to a method for reducing CO 2 A method for preparing a high-efficiency photocatalytic material PCN-222-Zn for formic acid. Background technique [0002] The rapid development of today's world economy needs to consume a large amount of fossil energy, and the consumption of fossil energy will inevitably lead to the increase of carbon dioxide content in the atmosphere. Increased carbon dioxide levels in the atmosphere will produce a greenhouse effect, further contributing to global warming. Global warming will cause sea level rise and precipitation redistribution, thereby changing the current world climate pattern, destroying the existing life chain and food chain, and bringing serious natural consequences to human beings. At present, in order to reduce the emission of carbon dioxide in the air, people often use technologies such as solvent absorption method,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C08G83/00C07C51/00C07C53/02
CPCB01J31/183C08G83/008B01J31/1691C07C51/00B01J2231/625B01J2531/26C07C53/02
Inventor 金佳瑞龚伟平陈学军朱方龙
Owner HUIZHOU UNIV
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