Cage porous platinum-palladium composite nanoparticle having excellent catalysis performance on methanol, and preparation method thereof

A technology of composite nanoparticles and catalytic properties, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., to achieve the effects of low preparation temperature, high yield, and easy operation of the process

Inactive Publication Date: 2015-09-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, the synthesis of cage-like porous platinum-palladium composite nanoparticles still faces many challenges, and its preparation route is rarely reported.

Method used

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  • Cage porous platinum-palladium composite nanoparticle having excellent catalysis performance on methanol, and preparation method thereof
  • Cage porous platinum-palladium composite nanoparticle having excellent catalysis performance on methanol, and preparation method thereof
  • Cage porous platinum-palladium composite nanoparticle having excellent catalysis performance on methanol, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of cage-like porous platinum-palladium composite nanoparticles (80:20 platinum-palladium atomic percentage)

[0032] First add sodium tetrachloroplatinate (Na 2 PtCl 4 ), potassium chloropalladate (K 2 PdCl 4 ), hydrochloric acid (HCl), polyoxyethylene-polyoxypropylene-polyoxyethylene (P123) aqueous solution, shake well to obtain a mixed solution; then quickly add ascorbic acid (AA) to obtain a reaction precursor solution, tetrachloride in the precursor solution Sodium Platinate (Na 2 PtCl 4 ), potassium chloropalladate (K 2 PdCl 4 ), hydrochloric acid (HCl), polyoxyethylene-polyoxypropylene-polyoxyethylene (P123), ascorbic acid (AA) concentrations are 0.008 mol / L, 0.002 mol / L, 0.06 mol / L, 0.00007 mol / L, 0.05 mol / L; transfer the precursor solution to a KQ2200DA digitally controlled ultrasonic instrument, and ultrasonicate for 4 hours at 35°C to obtain a cage-like porous platinum-palladium nanocolloid solution; use a high-speed centrifuge to centrif...

Embodiment 2

[0034] Preparation of cage-like porous platinum-palladium composite nanoparticles (platinum-palladium atomic percentage 75:25)

[0035] First add sodium tetrachloroplatinate (Na 2 PtCl 4 ), potassium chloropalladate (K 2 PdCl 4 ), hydrochloric acid (HCl), polyoxyethylene-polyoxypropylene-polyoxyethylene (P123) aqueous solution, shake well to obtain a mixed solution; then quickly add ascorbic acid (AA) to obtain a reaction precursor solution, tetrachloride in the precursor solution Sodium Platinate (Na 2 PtCl 4 ), potassium chloropalladate (K 2 PdCl 4 ), hydrochloric acid (HCl), triembedded polymer Pluronic P123, and ascorbic acid (AA) concentrations were 0.0075 mol / L, 0.0025 mol / L, 0.06 mol / L, 0.00007 mol / L, 0.05 mol / L; the precursor solution Transfer to a KQ2200DA numerically controlled ultrasonic instrument, and ultrasonicate at 35°C for 4 hours to obtain a cage-like porous platinum-palladium nanocolloid solution; use a high-speed centrifuge to centrifuge at a spee...

Embodiment 3

[0037] Preparation of cage-like porous platinum-palladium composite nanoparticles (platinum-palladium atomic percentage 95:5)

[0038] First add sodium tetrachloroplatinate (Na 2 PtCl 4 ), potassium chloropalladate (K 2 PdCl 4 ), hydrochloric acid (HCl), polyoxyethylene-polyoxypropylene-polyoxyethylene (P123) aqueous solution, shake well to obtain a mixed solution; then quickly add ascorbic acid (AA) to obtain a reaction precursor solution, tetrachloride in the precursor solution Sodium Platinate (Na 2 PtCl 4 ), potassium chloropalladate (K 2 PdCl 4 ), hydrochloric acid (HCl), polyoxyethylene-polyoxypropylene-polyoxyethylene (P123), ascorbic acid (AA) concentrations are 0.0095 mol / L, 0.0005 mol / L, 0.06 mol / L, 0.00007 mol / L, 0.05 mol / L; transfer the precursor solution to a KQ2200DA numerically controlled ultrasonic instrument, and ultrasonicate at 35°C for 4 hours to obtain a cage-like porous platinum-palladium nanocolloid solution; use a high-speed centrifuge to centr...

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Abstract

The invention relates to a cage porous platinum-palladium composite nanoparticle and a preparation method thereof. The cage porous platinum-palladium composite nanoparticle has the characteristics of uniform scale, high specific surface area and good catalytic activity, and the components of the nanoparticle can be effectively regulated in a large range (a Pt/Pd molar ratio of 3-19). The complete preparation method of the nanoparticle comprises the following steps: 1, sequentially sodium tetrachloroplatinate, potassium tetrachloropalladate, hydrochloric acid, polyoxyethylene-polyoxypropylene-polyoxyethylene (P123) and ascorbic acid into an aqueous solution to obtain a reaction precursor solution; and 2, carrying out ultrasonic treatment on the precursor solution at 35DEG C for 4h, centrifuging at a rotating speed of 7000-10000r/min, and separating to obtain a black precipitate which is the platinum-palladium composite nanoparticle. The cage porous platinum-palladium composite nanoparticle prepared in the invention has important application values and wide application prospect in fuel cells, industrial catalysis, automobile tail gas purification, water splitting and carbon monoxide catalytic oxidation.

Description

technical field [0001] The invention relates to a cage-shaped porous platinum-palladium composite nanoparticle with excellent catalytic performance for methanol and a preparation method thereof. Background technique [0002] As an important catalyst, noble metal platinum (Pt) has a wide range of applications in industrial catalysis, fuel cells, automobile exhaust purification, water splitting, and catalytic oxidation of carbon monoxide. Especially in the field of catalysis, platinum is an active component that is difficult to be replaced. For example, in low-temperature fuel cells, platinum or its alloys are currently the most effective catalysts for accelerating electrochemical reactions. In addition, platinum is the only platinum group metal that can withstand the acidic environment in low-temperature fuel cells. However, platinum is a rare and precious metal, and its price is very expensive, resulting in high cost of low-temperature fuel cells, which limits the wide and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J35/10B82Y30/00B82Y40/00
Inventor 张风收李村成张涛李杰
Owner UNIV OF JINAN
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