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Pd/TiO2/C composite nano-catalyst, and preparation method and application thereof

A nano-catalyst and nano-technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of scarcity and high cost of resources, and improve catalytic stability. , the effect of high catalytic activity and stability

Inactive Publication Date: 2012-07-04
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Pt has certain limitations in practical applications due to its high cost and scarcity of resources.

Method used

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  • Pd/TiO2/C composite nano-catalyst, and preparation method and application thereof
  • Pd/TiO2/C composite nano-catalyst, and preparation method and application thereof
  • Pd/TiO2/C composite nano-catalyst, and preparation method and application thereof

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preparation example Construction

[0042] The preparation method of Pd / C catalyst catalyst:

[0043] Pd nanoparticles were loaded on the pretreated activated carbon by the liquid phase reduction method, so that the Pd metal loading was 20% of the total weight of Pd / C, and then 138.22 mg (five times the molar amount of Pd in ​​the raw material) was added Trisodium citrate was used as a stabilizer, and excess sodium borohydride was added dropwise as a reducing agent. After reacting for 3 hours, it was filtered by suction, washed with water until there was no residual chloride ion, and dried under vacuum to obtain a Pd / C nanocatalyst.

[0044] In order to Pd / TiO of the present invention 2 / C composite nanocatalyst and the catalytic performance of Pd / C nanocatalyst to characterize, the nanocatalyst needs to be made into a catalytic electrode, and its preparation method is as follows:

[0045] The required nano-catalyst, 95% absolute ethanol and 5% Nafion (perfluororesin) solution are prepared according to the mass...

Embodiment 1

[0054] A Pd / TiO 2 / C composite nano-catalyst, composed of nano-Pd, nano-TiO 2 Composed of activated carbon powder, calculated by mass ratio, consisting of Pd: nano-TiO 2 : The ratio of activated carbon powder is 1:2:2;

[0055] The particle size of the nanometer Pd is 3-5nm;

[0056] The nano-TiO 2 The particle size is 20-150nm;

[0057] The particle size of the activated carbon powder is 50-80 μm.

[0058] One of the above Pd / TiO 2 The preparation method of / C composite nano-catalyst comprises the steps:

[0059] (1) Nano-TiO was prepared by hydrothermal synthesis 2 powder

[0060] That is, 2.5mL of tetrabutyl titanate was used as the precursor, dissolved in 25mL of ethylene glycol with a concentration of 99%, and the magnetic stirring speed was controlled at 600-700r / min, and the concentration of (ethanol: water =10mL:1.3mL) 88%% ethanol aqueous solution to obtain a mixed solution A, then pour this mixed solution A into a high-pressure reactor with a polytetrafluoro...

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Abstract

The invention discloses a Pd / TiO2 / C composite nano-catalyst and a preparation method thereof. The Pd / TiO2 / C composite nano-catalyst consists of nano-Pd, nano-TiO2 and active carbon powder, wherein the mass ratio of the nano-Pd to the nano-TiO2 to the active carbon powder is preferably 1:2:2. The preparation method comprises the steps of preparing nano-TiO2 powder by a hydrothermal synthesis method, preparing a mixed solution of a carrier consisting of active carbon and TiO2, loading Pd nanoparticles on the carrier consisting of the active carbon and the TiO2 by a liquid phase reducing method and the like. The nano-TiO2 with high stability in acid and alkaline solution and the treated active carbon form the composite carrier, so compared with the traditional carrier only comprising the active carbon, the Pd / TiO2 / C composite nano-catalyst has higher catalytic activity on ethanol and stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-catalyst materials, in particular to a Pd / TiO with high catalytic activity to ethanol 2 / C composite nano catalyst and its preparation method. Background technique [0002] Direct alcohol fuel cell (DAFC) has become the frontier topic of current fuel cell research due to its unique advantages such as abundant fuel source, low price, safe and convenient portability and storage[1-2]. Among them, direct methanol fuel cell (DMFC) However, due to the toxicity of methanol to a certain extent, its application in mobile power sources such as mobile phones and laptops is limited. Therefore, it is necessary to explore other non-toxic organic small molecule fuels. Ethanol is the simplest of chain alcohols Compared with methanol, it has the following advantages: (1) cheap, safe, and non-toxic; (2) easy to transport and has low volatility; (3) higher theoretical specific energy; (4) ethanol It ha...

Claims

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Application Information

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IPC IPC(8): H01M4/90B01J23/44
CPCY02E60/50
Inventor 李巧霞杨意超刘明爽徐群杰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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