Microorganism-supported platinum-palladium alloy nano catalyst and preparation method thereof

A nano-catalyst, platinum-palladium alloy technology, applied in the field of precious metal nano-materials, to achieve the effects of high catalytic activity, small size, and enhanced absorption

Pending Publication Date: 2018-12-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the preparation of metal nanomaterials by microbial reduction is mostly single-metal nanomaterials, and it is difficult for single-metal nanomaterials to meet multiple requirements such as high catalytic activity, reusability and stability at the same time.

Method used

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  • Microorganism-supported platinum-palladium alloy nano catalyst and preparation method thereof
  • Microorganism-supported platinum-palladium alloy nano catalyst and preparation method thereof
  • Microorganism-supported platinum-palladium alloy nano catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A kind of microorganism-loaded platinum-palladium alloy nanocatalyst of the present invention, mass concentration ratio (bacteria: platinum: palladium) is 30:1:1, prepares the platinum-palladium alloy nanocatalyst that average size is 13nm and uniform dispersion, Figure 1-3 The transmission electron microscope picture, the scanning electron microscope picture and the X-ray diffraction picture of the nano-catalyst are respectively.

[0045] The preparation method of the immobilized microbial adsorbent comprises the following steps:

[0046] (1) Inoculate the bacteria liquid of Shewanella oneidensis MR-1 into 100mL of sterilized LB medium under sterile conditions, expand the culture at 30°C and 170r / min for 24h, and then inoculate at 10000rpm Centrifuge for 10 minutes to collect the wet cells after activation and culture;

[0047] (2) Prepare a mixed solution with a platinum and palladium metal ion concentration of 100 mg / L (the mass ratio of platinum and palladium meta...

Embodiment 2

[0060] A kind of microorganism-loaded platinum-palladium alloy nanocatalyst of the present invention, mass concentration ratio (bacterium: platinum: palladium) is 50:1:1, prepares the platinum-palladium alloy nanocatalyst that average size is 10nm and uniform dispersion, Figure 6-7 They are the transmission electron microscope picture and the scanning electron microscope picture of the nano-catalyst, respectively.

[0061] The preparation method of the immobilized microbial adsorbent comprises the following steps:

[0062] (1) Inoculate the bacteria liquid of Shewanella oneidensis MR-1 into 100mL of sterilized LB medium under sterile conditions, expand the culture at 30°C and 170r / min for 24h, and then inoculate at 10000rpm Centrifuge for 10 minutes to collect the wet cells after activation and culture;

[0063] (2) Prepare a mixed solution with a platinum and palladium metal ion concentration of 100 mg / L (the mass ratio of platinum and palladium metal ions is 1:1), adjust t...

Embodiment 3

[0073] A kind of microorganism-loaded platinum-palladium alloy nanocatalyst of the present invention, mass concentration ratio (bacteria: platinum: palladium) is 30:1:1, prepares the platinum-palladium alloy nanocatalyst that average size is 21nm and uniform dispersion, Figure 9-10 They are the transmission electron microscope picture and the scanning electron microscope picture of the nano-catalyst, respectively.

[0074] The preparation method of the immobilized microbial adsorbent comprises the following steps:

[0075] (1) Inoculate the bacteria liquid of Shewanella oneidensis MR-1 into 100mL of sterilized LB medium under sterile conditions, expand the culture at 30°C and 170r / min for 24h, and then inoculate at 10000rpm Centrifuge for 10 minutes to collect the wet cells after activation and culture;

[0076] (2) Prepare a mixed solution with a platinum and palladium metal ion concentration of 100 mg / L (the mass ratio of platinum and palladium metal ions is 1:1), adjust t...

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Abstract

The invention discloses a microorganism-supported platinum-palladium alloy nano catalyst. The microorganism=supported platinum-palladium alloy nano catalyst adopts microorganisms as a carrier, and platinum-palladium alloy nano particles are supported inside and/or outside cells of the microorganisms. The invention also provides a preparation method of the microorganism-supported platinum-palladiumalloy nano catalyst. The preparation method comprises the following steps: inoculating the microorganisms into an LB culture medium, performing enlarged culture, and centrifuging to obtain wet thallus; preparing a mixed solution of platinum and palladium metal ions; and adding the wet thallus into the mixed solution, adsorbing to obtain a mixed sample of the microorganism and metal, adding an electron donor, introducing nitrogen, removing oxygen in the mixed sample, then performing reduction reaction, vacuum freeze drying, and obtaining the microorganism-supported platinum-palladium alloy nano catalyst. The microorganism=supported platinum-palladium alloy nano catalyst of the invention can simultaneously meet various requirements of high catalytic activity, reusability, stability and thelike. The preparation method of the invention is simple in preparation process, low in cost and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of noble metal nanomaterials, and in particular relates to a microorganism-loaded platinum-palladium alloy nanocatalyst and a preparation method thereof. Background technique [0002] Noble metal nanomaterials exhibit special properties that bulk materials do not have, such as quantum size effect, small size effect, surface effect, macroscopic quantum tunneling effect, etc., and thus have unique properties in the fields of optics, electricity, magnetism, thermal and catalysis , has a wide range of applications in chemical catalysis, hydrogen storage materials, fuel cell catalytic electrodes, sensors, and automobile exhaust gas treatment. Traditional physical and chemical synthesis methods generally require high temperature and high pressure reaction conditions, high energy consumption, and the use of toxic reducing agents and protective agents, which are likely to cause environmental pollution; usage is not ideal. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44C02F3/34C02F101/30C02F101/38
CPCB01J23/44C02F3/34C02F2101/308C02F2101/38
Inventor 谢建平徐航刘新星邱冠周武海艳
Owner CENT SOUTH UNIV
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