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Method for regulating and controlling interaction between metal nanoparticles and carrier by plasma

A technology of metal nanoparticles and plasma, which is applied in separation methods, non-metallic elements, and dispersed particle separation, etc., can solve problems such as poor catalyst stability, achieve the effects of ensuring catalyst activity, convenient operation, and improving catalytic activity

Active Publication Date: 2021-01-29
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention researches and designs a method for regulating the interaction between metal nanoparticles and carriers by plasma to solve the disadvantage of poor stability of catalysts prepared by plasma technology

Method used

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  • Method for regulating and controlling interaction between metal nanoparticles and carrier by plasma
  • Method for regulating and controlling interaction between metal nanoparticles and carrier by plasma
  • Method for regulating and controlling interaction between metal nanoparticles and carrier by plasma

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for plasma regulating the interaction between metal nanoparticles and carriers, comprising the following steps:

[0038] a. Weigh 5g of chloroauric acid and dissolve it in 500ml of water to prepare 2.4×10 -2 mol / L chloroauric acid standard solution (gold precursor standard solution), weigh 10mg platinum chloride and dissolve it in 100mL deionized water to prepare 3.77×10 -3 mol / L platinum nitrate solution (platinum precursor solution), weigh 1g sodium hydroxide and dissolve in 50mL deionized water to prepare 0.5mol / L sodium hydroxide solution;

[0039] b. Weigh 2gTiO 2 (Mixed crystals of rutile and anatase) were added to a beaker filled with 100mL of platinum nitrate and chloroauric acid solution (the volume ratio of the two was 1:1), and mixed evenly under the condition of 1000r / min, using 0.5mol / L Sodium hydroxide solution adjusts the pH value to 8 (greater than TiO 2 Isoelectric point 6), the sample is mixed for 1 hour, so that the gold platinum precursor...

Embodiment 2

[0048] a. Weigh 2g of chloroauric acid and dissolve it in 200ml of water to prepare 2.4×10 -2 The chloroauric acid standard solution (gold precursor standard solution) of mol / L;

[0049] b. Weigh 2gCeO 2 Add the powder into a beaker containing 20mL of chloroauric acid solution with a certain concentration to impregnate the carrier with the chloroauric acid solution, and let the sample stand for 12 hours to fully load the gold precursor on CeO 2 ;

[0050] c. Alternate washing of alkaline solution and neutral solution (deionized water) is carried out to the obtained impregnated product, and the washing is repeated more than two times until 2.0×10 -2 mol / L AgNO 3 Titrate the solution until no precipitation occurs; the pH of the alkaline solution must meet ≥8 (higher than CeO 2 The isoelectric point of the powder is 7.6); after each washing, ultrasonic treatment is required for 10 minutes, followed by centrifugation for 10 minutes to obtain a solid sample;

[0051] d. Dry th...

Embodiment 3

[0058] a. Weigh 1g palladium chloride and dissolve it in 200ml water to prepare 3×10 -2 The nitric acid standard solution (palladium precursor standard solution) of mol / L, takes by weighing 1g sodium hydroxide and is dissolved in 50ml deionized water and prepares the sodium hydroxide solution of 0.5mol / L;

[0059] b. Weigh 2g γ-Al 2 o 3 Add it into a beaker containing 60ml of palladium chloride solution, mix evenly under the condition of 1000r / min, use 0.5mol / L sodium hydroxide solution to adjust the pH value to 9, mix the sample for 1 hour, and precipitate the palladium precursor on γ-Al 2 o 3 surface;

[0060] c. Use sodium hydroxide solution with a pH value of 9 and deionized water to alternately wash the deposited and precipitated samples, and wash more than 2 times until 2.0×10 -2 mol / L AgNO 3 No precipitation occurred in the titration of the solution, and the washing solution was filtered to obtain a solid sample;

[0061] d. Dry the obtained solid sample in an ov...

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Abstract

The invention discloses a method for regulating and controlling interaction between metal nanoparticles and a carrier by plasma, which comprises the following steps: S1, loading a metal precursor on the carrier by adopting an impregnation method or a deposition-precipitation method, and cleaning and drying to obtain a catalyst; s2, putting the obtained catalyst into a plasma generating device, andpretreating the catalyst by adopting plasma in a reducing atmosphere; s3, in an oxidizing atmosphere, activating the catalyst by adopting plasma; and S4, after activation treatment, treating the catalyst by adopting plasma in a reducing atmosphere to obtain the supported metal catalyst. According to the method disclosed by the invention, the supported catalyst is pretreated, activated and retreated in sequence by utilizing plasmas generated by discharging in different atmospheres, so that the interaction between the metal nanoparticles and the carrier is effectively modulated, and the stability of the nano-catalyst is remarkably enhanced while the sizes of the metal nanoparticles are controlled.

Description

technical field [0001] The invention belongs to the technical field of plasma surface engineering, and in particular relates to a method for regulating the interaction between metal nanoparticles and carriers by plasma. Background technique [0002] Supported nanocatalysts have excellent catalytic performance and play an important role in industrial catalytic processes in the fields of environment and energy. Generally, loading metal nanoparticles on the surface of high specific surface area supports to form heterogeneous catalysts is a common and effective method to improve catalytic activity. However, studies have found that the interaction between metal nanoparticles and supports also has an important impact on the catalytic performance. The interaction between metal nanoparticles and the carrier can not only control the particle size, regulate the carrier effect between the two, but also the key to obtain high stability nanocatalysts. [0003] Currently, heat treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/66B01J23/44B01J37/03B01J37/08B01J37/34B01J37/18B01J37/14C07C5/09C07C11/04B01D53/86B01D53/62C01B3/16
CPCB01J23/52B01J23/66B01J23/44B01J37/035B01J37/08B01J37/349B01J37/18B01J37/14C07C5/09B01D53/864C01B3/16C07C2523/44B01J35/23C07C11/04Y02P20/52
Inventor 朱斌张璐瑶朱益民闫妍高亚楠
Owner DALIAN MARITIME UNIVERSITY
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