Photochemical preparation method for Pd core @Pt shell nanometer catalyst

A nano-catalyst and photochemical technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of long reaction time, complex process, and difficulty in amplification, Achieve the effect of low cost, simple preparation process and easy control

Inactive Publication Date: 2012-12-26
SHENYANG INST OF ENG
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Problems solved by technology

This method has complex process, high requirements

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  • Photochemical preparation method for Pd core @Pt shell nanometer catalyst

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Embodiment 1

[0019] 1) Take 2 ml of PdCl containing Pd(II) 300 mg / L 2 Solution, after diluting with water, add 2.5 g of PEG400, 2 ml of acetone, dilute to 25 ml with water, and mix well.

[0020] 2) Transfer the mixture solution to a quartz reactor and irradiate it under a 254 nm ultraviolet lamp (48W) for 15 min until the surface plasmon resonance spectrum absorbance of Pd particles in the solution system no longer changes.

[0021] 3) Take 2 ml of H containing Pt(IV) 600 mg / L 2 PtCl 6 Solution, after diluting with water, add 2.5 g of PEG400, 2 ml of acetone and the nano-Pd colloid solution obtained in step 2), dilute to 50 ml with water, and mix well.

[0022] 4) Transfer the mixture solution to a quartz reactor and irradiate it under a 254 nm ultraviolet lamp (48W) for 20 min until the surface plasmon resonance spectrum absorbance of the metal particles in the solution system does not change, that is, the Pd:Pt mass ratio of 1 :2 Pd core Pt shell nanocolloids. According to the propo...

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Abstract

The invention provides a photochemical preparation method for a Pd core @Pt shell nanometer catalyst and relates to a preparation method for a catalyst. The preparation method comprises the following steps: taking and mixing PdCl2 aqueous solution, polyethylene glycol and acetone aqueous solution, thereby obtaining a mixed solution a; taking and mixing H2PtCl6 aqueous solution, polyethylene glycol and acetone aqueous solution, thereby obtaining a mixed solution b; irradiating the mixed solution a by adopting ultraviolet rays, thereby obtaining a nanometer Pd colloidal solution c; mixing the solution c with the mixed solution b, thereby obtaining a mixed solution d; irradiating the mixed solution d by adopting the ultraviolet rays, thereby obtaining a Pd core @Pt shell nanometer colloidal solution e; and under the condition of the colloidal solution e obtained through stirring, immersing a carbon carrier for 2-24h, leaching and washing with de-ionized water till no chlorine exists, thereby obtaining the Pd core @Pt shell nanometer catalyst. The catalyst nanometer grain obtained according to the technology has a core-shell compound structure; the size of the grain is easily controlled and the monodispersity is excellent; and the preparation method is widely applied to the field of low-temperature fuel cells.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a photochemical preparation method of a Pd core Pt shell nanometer catalyst. Background technique [0002] Low-cost low-temperature fuel cell catalysts are currently one of the main directions of technological development in this field. At present, commercial catalysts are mainly Pt / C and PtRu / C catalysts. Pd has attracted the attention of researchers in recent years due to its lower price and wide range of catalytic activities compared with Pt. The Pd core Pt shell nanostructure can make Pt with higher price and excellent catalytic performance mainly distributed on the surface of catalyst particles, which is beneficial to improve the utilization rate of Pt and reduce the cost of catalyst. Patent CN 102107137A proposes a method for preparing a Pt-Pd catalyst by impregnating a carrier with a precursor solution and performing thermochemical reduction. This method cannot obta...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J35/02H01M4/92
CPCY02E60/50
Inventor 董颖男丛璐李珊珊
Owner SHENYANG INST OF ENG
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