Hydro-thermal synthetic method and application of Pt-Ru bimetal nanoparticles

A bimetallic nano and hydrothermal synthesis technology, applied in the field of catalysis, can solve the problem of inability to synthesize stable face-centered cubic phase Ru nanoparticles, and achieve the effect of overcoming the low selectivity of alkenes and alkanes, high activity and good selectivity

Active Publication Date: 2015-04-08
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Ru nanoparticles synthesized by the traditional synthesis method are mainly hexagonal, and it is impossible to synthesize stable face-centered cubic Ru nanoparticles.

Method used

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  • Hydro-thermal synthetic method and application of Pt-Ru bimetal nanoparticles
  • Hydro-thermal synthetic method and application of Pt-Ru bimetal nanoparticles
  • Hydro-thermal synthetic method and application of Pt-Ru bimetal nanoparticles

Examples

Experimental program
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Embodiment 1

[0030] Synthesis of embodiment 1 Pt-Ru nanoparticles (without adding surface adsorbent)

[0031] Dissolve 0.01 g of platinum precursor salt potassium chloroplatinite and 0.064 g of ruthenium trichloride in 15 mL of water, and simultaneously add 0.1 g of PVP, 0.2 mL of aqueous formaldehyde (mass fraction 40%), 0.065 mL of hydrochloric acid (1mol L -1 ). Transfer the solution to a hydrothermal kettle. Raise the temperature to 160° C. and reduce for 8 hours to prepare 10 wt % Pt-Ru nanoparticles with an average particle diameter of 5±20 nm.

[0032] The morphology of the Pt-Ru bimetallic nanoparticles synthesized in the present invention is observed by using a dark field scanning transmission mode of a 200keV transmission electron microscope.

[0033] The preparation method of the transmission electron microscope sample is as follows: add a small amount of acetone or ethanol to the Pt-Ru nanoparticle dispersion taken out of the hydrothermal kettle, and use ultrasonic dispersion...

Embodiment 2

[0038] Synthesis of embodiment 2 Pt-Ru nanoparticles (adding potassium bromide surface adsorbent)

[0039] Dissolve 0.01 g of platinum precursor salt potassium chloroplatinite and 0.064 g of ruthenium trichloride in 15 mL of water, and simultaneously add 0.1 g of PVP, 0.2 mL of aqueous formaldehyde (mass fraction 40%), 0.065 mL of hydrochloric acid (1mol L -1 ), 1 g potassium bromide. Transfer the solution to a hydrothermal kettle. Heating up to 160°C and reducing for 8 hours, spherical 10wt% Pt-Ru nanoparticles were prepared, and its electron micrograph is as follows: figure 2 Shown, the X-ray diffraction spectrum is shown in Figure 5 .

Embodiment 3

[0040]Synthesis of embodiment 3 Pt-Ru nanoparticles (adding sodium oxalate surface adsorbent)

[0041] Dissolve 0.01 g of platinum precursor salt potassium chloroplatinite and 0.064 g of ruthenium trichloride in 15 mL of water, and simultaneously add 0.1 g of PVP, 0.2 mL of aqueous formaldehyde (mass fraction 40%), 0.065 mL of hydrochloric acid (1mol L -1 ), 80mg sodium oxalate. Transfer the solution to a hydrothermal kettle. Heating up to 160°C and reducing for 8 hours, tetrahedral 10wt% Pt-Ru nanoparticles were prepared, the electron micrographs of which are shown in image 3 Shown, the X-ray diffraction spectrum is shown in Figure 6 .

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Abstract

The invention discloses a hydro-thermal synthetic method and application of Pt-Ru bimetal nanoparticles. The method includes: dissolving precursor platinum salt and precursor ruthenium salt in water, adding polyvinylpyrrolidone and formaldehyde prior to mixing, placing mixture in a sealed container, and heating the container to 150 to 170 DEG C to allow 4 to 8 hours of reduction reaction so as to obtain the Pt-Ru bimetal nanoparticles. The Pt-Ru bimetal nanoparticles can serve as a good catalyst for low-temperature (130 to 170 DEG C) aqueous-phase Fischer-Tropsch synthesis, with catalytic activity superior to Ru nanoparticles made by methods such as H2 reduction and NaBH4 reduction and far superior to Fe and Co nanoparticles.

Description

technical field [0001] The invention belongs to the field of catalysis, and relates to a preparation method and application of Pt-Ru bimetallic nanoparticles, in particular to a hydrothermal synthesis method and application of Pt-Ru bimetallic nanoparticles with good low-temperature aqueous phase Fischer-Tropsch synthesis performance . Background technique [0002] Fischer-Tropsch synthesis can convert energy sources such as coal, natural gas, and biomass into valuable liquid fuels and chemicals. Fischer-Tropsch synthetic oil has the advantages of high purity and no sulfur and nitrogen. It plays an important role in today's increasingly scarce petroleum resources and stricter refining standards for petroleum products. Fischer-Tropsch oil can well supplement existing refined oil . [0003] The main catalysts for Fischer-Tropsch synthesis are Ru, Fe or Co, among which Ru catalyst has the highest activity. Because Fischer-Tropsch synthesis is an exothermic process, it is fea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 马丁张亚文顾均李为真严纯华
Owner PEKING UNIV
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