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A method for photocatalytic decomposition of formic acid

A technology of photocatalysis and formic acid, applied in the field of photocatalysis, can solve the problems of high cost of hydrogen production, low catalytic efficiency, poor catalytic stability, etc., and achieve the effects of high selectivity and stability, short process and low cost

Active Publication Date: 2022-01-14
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the problems that existing methods for decomposing formic acid use noble metal catalysts, poor catalytic stability, low catalytic efficiency, and high cost of hydrogen production, the present invention provides a method for photocatalytically decomposing formic acid, using semiconductors and cocatalysts The formed complex is used as a catalyst for decomposing formic acid, so that the method shows better catalytic stability and higher catalytic efficiency, and has higher application value

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  • A method for photocatalytic decomposition of formic acid
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  • A method for photocatalytic decomposition of formic acid

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Embodiment 1

[0053] The present embodiment provides a kind of method of photocatalytic decomposition of formic acid, and its specific method is:

[0054] (1) Dissolve 5.44g of sodium formate in 20mL of formic acid (the concentration of sodium formate is 4.0mol / L), transfer to a 60mL quartz tube and add 1mg of Fe to it 2 P / CdS complex (in the complex, Fe 2 The mass fraction of P nanoparticles is 5wt%) to obtain a mixed solution;

[0055] (2) Degas the mixed solution with argon, remove the dissolved air in the solution, and then seal it with a rubber stopper; irradiate the quartz tube with an LED lamp (3W×30 pieces) with a light emitting wavelength of >420nm , generate hydrogen; every 2h with gas chromatography to detect the type and quantity of generated gas.

[0056] Among them, Fe 2 The synthesis of P can refer to the literature Catal.Sci.Technol.5(2015)4964-4967. Fe 2 The TEM morphology and XRD spectrum of P are as follows image 3 and Figure 4 shown. The Fe 2 The preparation m...

Embodiment 2

[0064] The present embodiment provides a kind of method of photocatalytic decomposition of formic acid, and its specific method is:

[0065] (1) Take 1 mg of CoP / CdS composite (in the composite, the mass fraction of CoP nanoparticles is 10wt%) and add it to 20 mL of sodium formate formic acid solution with a concentration of 5.0 mol / L, then sonicate for 5 min, and transfer to 60 mL of quartz tube;

[0066] (2) Use argon to remove the air from the mixed solution, and then seal it after removing the air; use an LED lamp (3W×30 pieces) with a light emitting wavelength of >420nm to irradiate the mixed solution to generate hydrogen and carbon dioxide; Chromatography detects the type and amount of gas produced.

[0067] Wherein, the preparation method of the CoP / CdS composite is as follows: 90 mg of CdS nanoparticles and 10 mg of CoP are mixed and ground in platinum, and ground for 30 minutes to obtain the CoP / CdS composite.

[0068] The curve of gas production in this embodiment ...

Embodiment 3

[0071] The present embodiment provides a kind of method of photocatalytic decomposition of formic acid, and its specific method is:

[0072] (1) Take 1mg Ni 2 P / CdS composite (composite, Ni 2 The mass fraction of P nanoparticle is 1.0wt%) join in the formic acid solution of the sodium formate that 20mL concentration is 3.0mol / L, sonicate 5min then, transfer in the quartz tube of 60mL;

[0073] (2) Use argon to remove the air from the mixed solution, and then seal it after removing the air; use an LED lamp (3W×30 pieces) with a light emitting wavelength of >420nm to irradiate the mixed solution to generate hydrogen and carbon dioxide; Chromatography detects the type and amount of gas produced.

[0074] Among them, the Ni 2 The preparation method of the P / CdS composite is as follows: 99mg CdS nanoparticles and 1mgNi 2 P is mixed and ground in platinum, and ground for 30 minutes to obtain Ni 2 P / CdS complex.

[0075] The curve of gas production in this embodiment as a funct...

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Abstract

The invention discloses a method for photocatalytically decomposing formic acid. The method comprises the following steps: (1) adding a compound formed by a semiconductor and a cocatalyst into a mixed solution of formic acid and formate to obtain a mixed reaction solution; ( 2) irradiating the mixed reaction solution with light to generate hydrogen gas. The average hydrogen production efficiency of the method for photocatalytic decomposition of formic acid provided by the invention can reach 76 μmol / mg / h, the selectivity is >99.5%, and the stability is extremely high. The catalytic system can stably catalyze the decomposition of formic acid for more than 7 days; and the method is short in process, low in cost, does not require complex reaction equipment, is more conducive to practical application, and has a good industrialization prospect.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a method for photocatalytically decomposing formic acid. Background technique [0002] Utilizing solar energy for photocatalytic energy conversion is an effective way to solve the current energy shortage and environmental pollution problems, especially the conversion of solar energy into green and pollution-free hydrogen energy is an important direction of current research. Formic acid is an ideal hydrogen carrier because of its low toxicity, low cost, high stability and high hydrogen content. The reaction formula for the decomposition of formic acid is: HCOOH→H 2 +CO 2 . At present, most studies mainly use noble metals for thermocatalytic decomposition of formic acid. There are still very few studies on the photocatalytic decomposition of formic acid, especially the use of cheap metals as catalysts. [0003] CN 103240108 B discloses a molybdenum carbide catalyst for pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/22
CPCC01B3/22C01B2203/0277C01B2203/1041C01B2203/1211C01B2203/1094
Inventor 朴玲钰曹爽吴志娇伏兵
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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