A method for the efficient reductive defluorination of perfluorinated compounds by bimetallic synergistic catalysis

A perfluorinated compound, bimetal synergistic technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem that the catalytic activity needs to be further improved, etc. To achieve the effect of high catalytic activity and anti-poisoning performance, efficient treatment, and cost reduction

Active Publication Date: 2022-05-06
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Lee et al. used the Zn0-VB12-titanium(III) citrate system to achieve the partial defluorination degradation of branched-chain perfluorooctane sulfonic acid and branched-chain perfluorohexanesulfonic acid, but its catalytic activity still needs to be further improved
However, there are no literatures and patents on the degradation of perfluorinated compounds by using the supported bimetallic catalyst as a synergistic catalytic material and using the method of heterogeneous catalytic reduction defluorination

Method used

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  • A method for the efficient reductive defluorination of perfluorinated compounds by bimetallic synergistic catalysis
  • A method for the efficient reductive defluorination of perfluorinated compounds by bimetallic synergistic catalysis
  • A method for the efficient reductive defluorination of perfluorinated compounds by bimetallic synergistic catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, the preparation of heterogeneous catalytic reduction defluorination catalyst

[0027] Take a three-necked flask, add 5.21g [Ni(NH 3 ) 6 ] Cl 2 And dissolved in water, adjust the pH of the solution to be about 11.5, add pretreated activated carbon (AC) 20g to the above reaction system under magnetic stirring, continue stirring for 2.0h, add hydrazine hydrate under stirring, and continue the reaction for 1.5h, and respectively It was washed several times with distilled water and absolute ethanol, and dried in vacuum to obtain a 6% Ni / AC catalyst. Then take the three-necked flask and add 1.26g [Rh(NH 3 ) 5 ] Cl 3 And dissolved in water, adjust the pH of the solution to about 11.5, add the above-mentioned Ni / AC catalyst under magnetic stirring, continue to stir for 2.0h, add hydrazine hydrate under stirring, and continue to react for 1.5h, and wash several times with distilled water and absolute ethanol respectively , dried under vacuum to obtain Ni 0.0...

Embodiment 2

[0030] Example 2, the influence of different synergistic catalysts on the reductive defluorination of perfluorooctanoic acid

[0031] Weigh 50 mg of the catalyst prepared in Example 1, add it to a 100 mL three-necked flask, and add a concentration of 2 g / L perfluorooctanoic acid 10% 1,3-propylene glycol-water solution (V (1,3-propylene glycol) / V (water)=10 / 90) 80mL, with hydrogen as the hydrogen source (H 2 : 20mL / min), in the presence of inorganic base NaOH, the perfluorooctanoic acid in the liquid phase is carried out catalytic reduction defluorination treatment, the ratio of the amount of inorganic base NaOH to the amount of fluorine element in the reaction substrate is 1.5:1, the reaction pressure is 0.1MPa, and the reaction temperature is 45°C. See Table 2 for the specific reductive defluorination results.

[0032] Table 2 Different catalytic materials catalyze the reductive defluorination of PFOA

[0033] serial number Reaction substrate catalyst React...

Embodiment 3

[0034] Embodiment 3, different alkalis to Ni 0.08 @Rh 0.03 Effect of / AC Synergistic Catalyst on Reductive Defluorination of Perfluorooctanoic Acid

[0035] Weigh 50mg of the Ni0.08@Rh0.03 / AC synergistic catalyst prepared in Example 1, add it to a 100mL three-necked flask, and add 10% perfluorooctanoic acid-water solution (V(1 ,3-propanediol) / V (water)=10 / 90) 80mL, with hydrogen as the hydrogen source (H 2 : 20mL / min), carry out catalytic reduction defluorination treatment to perfluorooctanoic acid in the liquid phase in the presence of a strong base, the ratio of the amount of base to the amount of fluorine element in the reaction substrate is 1.5:1, and the reaction pressure is 0.1MPa , the reaction temperature is 45°C, and the specific reductive defluorination results are shown in Table 3.

[0036] Table 3 Ni in the presence of different bases 0.08 @Rh 0.03 / AC Catalyzed Heterogeneous Catalytic Reductive Defluorination of Perfluorooctanoic Acid

[0037] seri...

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Abstract

The invention relates to a treatment method for perfluorinated compounds, in particular to a method for the efficient reduction and defluorination of perfluorinated compounds by bimetallic synergistic catalysis. Using a supported synergistic catalyst with Rh and Ni as active components, hydrogen is used as a hydrogen source to carry out reductive defluorination of perfluorinated compounds in the presence of a strong basic proton absorber. The invention effectively utilizes the synergistic catalytic advantages of the two active metal components, improves the catalytic performance and stability of the material, has high efficiency, mild reaction conditions, easy operation control and low cost, and has good production and practical value.

Description

technical field [0001] The invention relates to a treatment method for perfluorinated compounds, in particular to a method for the efficient reduction and defluorination of perfluorinated compounds by bimetallic synergistic catalysis. Background technique [0002] Perfluorinated compounds (PFCs) have unique physical and chemical properties and are widely used in textiles, papermaking, packaging, pesticides, fire-fighting foams and other fields. Due to the mass production and use of perfluorinated compounds, such compounds have been detected in the atmosphere, soil, water, sediment, animals and plants, and even in domestic water, human serum, and milk. , has aroused extensive attention of researchers from all over the world. The C-F covalent bond in perfluorinated compounds has extremely high chemical bond energy, so these compounds generally have high stability and can withstand strong ultraviolet light irradiation, heating, chemical action, metabolism of microorganisms and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/37C02F101/36
CPCC02F1/70B01J23/892C02F2101/36
Inventor 马宣宣李晓涵李天成刘苏静刘莺夏传海
Owner LUDONG UNIVERSITY
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