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A platinum-supported catalyst based on a porous graphene/nanoceramic sandwich structure and its preparation method

A technology of porous graphene and nano-ceramic, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. It can solve the problems of expensive and complicated preparation and achieve deposition Uniform, uniform particle size effect

Inactive Publication Date: 2019-07-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is more complicated to operate and the preparation cost is too expensive

Method used

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  • A platinum-supported catalyst based on a porous graphene/nanoceramic sandwich structure and its preparation method
  • A platinum-supported catalyst based on a porous graphene/nanoceramic sandwich structure and its preparation method
  • A platinum-supported catalyst based on a porous graphene/nanoceramic sandwich structure and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of embodiment 1 porous graphene / silicon carbide supported platinum catalyst

[0032] (1) Weigh 0.25g of porous graphene (PG), add 100mL of deionized water, and disperse ultrasonically for 30min at 150W; add 0.25g of silicon carbide (SiC, 40nm), mix and stir at 60°C for 4h, freeze After drying, a porous graphene / silicon carbide carrier with a sandwich structure is obtained;

[0033] (2) Put the carrier in (1) into an atomic layer deposition device, and use trimethyl(methylcyclopentadienyl) platinum (IV) as a platinum source and oxygen to deposit platinum nanoparticles on the surface of the carrier. During the entire atomic deposition reaction process, high-purity nitrogen is continuously fed as a carrier gas, and the pressure in the chamber is controlled below 4mbar. The atomic layer deposition reaction temperature is 250°C. In order to ensure sufficient vapor pressure, the platinum source was heated to 65°C. To prevent condensation in the pipeline, the...

Embodiment 2

[0035] The preparation of embodiment 2 porous graphene / tungsten carbide supported platinum catalyst

[0036] (1) Weigh 0.25g of porous graphene (PG), add 100mL of deionized water, and disperse ultrasonically for 90min at 100W; add 0.05g of tungsten carbide (WC, 50nm), mix and stir at 80°C for 6h, freeze After drying, a porous graphene / tungsten carbide carrier with a sandwich structure is obtained;

[0037] (2) Put the carrier in (1) into the atomic layer deposition equipment, the whole atomic deposition reaction process is the same as step (2) in Example 1, the difference is that the atomic layer deposition reaction temperature is 275 ° C, repeat 120 times Cycle, that is, obtain porous graphene / tungsten carbide supported platinum catalyst.

Embodiment 3

[0038] The preparation of embodiment 3 porous graphene / boron carbide supported platinum catalyst

[0039] (1) Weigh 0.25g porous graphene (PG), add 100mL deionized water, and disperse ultrasonically for 60min at 120W; add 0.1g boron carbide (B 4 C, 50nm), after fully mixing and stirring at 80°C for 6h, freeze-drying to obtain a porous graphene / boron carbide carrier with a sandwich structure;

[0040] (2) Put the carrier in (1) into the atomic layer deposition equipment, the whole atomic deposition reaction process is the same as step (2) in Example 1, the difference is that the atomic layer deposition reaction temperature is 260 ° C, repeat 110 times Cycle, that is, to obtain porous graphene / boron carbide-supported platinum catalyst.

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Abstract

The invention relates to a platinum supported catalyst based on a porous graphene / nano ceramic sandwiched structure and a preparation method thereof. The platinum supported catalyst includes a porous graphene / nano ceramic carrier with a sandwiched structure and platinum nanoparticles uniformly deposited on the surface of the carrier; the porous graphene / nano ceramic carrier with the sandwiched structure takes porous graphene as a surface layer, and a nano ceramic as a core material is inserted into porous graphene sheet layers. Nanopores in the porous graphene are beneficial for axial transport and electron and proton conduction of water and reaction gas, so that the catalyst component utilization rate is improved, and the use amount of platinum is reduced; the porous graphene / nano ceramic sandwiched structure effectively provides platinum loading sites, migration aggregation of the platinum nanoparticles on the surface of the carrier is limited, and the stability of the catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a platinum-supported catalyst based on a porous graphene / nano-ceramic sandwich structure and a preparation method thereof. [0002] technical background [0003] Platinum (Pt)-based catalysts are widely used in fuel cell electrode catalysts, catalytic reforming in petrochemicals, and various fine chemicals due to their excellent oxygen reduction catalytic activity, high selectivity, and good electrochemical stability. Catalytic synthesis and other fields. However, the high cost of Pt leads to high cost of Pt-based catalysts, and the activity and stability of the catalyst will decrease during the long-term catalytic process, which are related to the specific surface area, electrical conductivity and electrochemical stability of the support. At present, the most widely used carrier is the traditional Vulcan XC-72, but because this carbon material is easily ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/224B01J27/22B01J23/42B01J23/652B01J23/63B01J27/24B01J35/10B01J37/34B01J37/03C23C16/18C23C16/455
CPCB01J23/42B01J23/63B01J23/6527B01J27/22B01J27/224B01J27/24B01J35/10B01J37/035B01J37/343C23C16/18C23C16/45555
Inventor 木士春孙镕慧刘小波寇宗魁
Owner WUHAN UNIV OF TECH
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