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A kind of preparation method of PT catalyst

A technology of catalysts and compounds, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of difficult interface guarantee and control.

Active Publication Date: 2016-09-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a synthetic strategy is not suitable for carbon supports, TiO 2 It is difficult to guarantee and control the interface with Pt three-phase

Method used

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  • A kind of preparation method of PT catalyst
  • A kind of preparation method of PT catalyst
  • A kind of preparation method of PT catalyst

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The present invention provides a method for preparing a Pt catalyst, which includes the following steps:

[0030] a) Mixing the carbon carrier, the Pt precursor, the titanium precursor, the regulator, and ethanol to obtain a mixed suspension, the regulator including an organic acid compound or an organic base compound;

[0031] b) irradiating the mixed suspension obtained in step a) with ultraviolet light to obtain a Pt catalyst.

[0032] The preparation method provided by the invention uses light to excite the titanium precursor to hydrolyze in situ to obtain TiO 2 The electrons generated at this time are used as reducing agents, and the electrons are used as Pt precursors to reduce the Pt atoms generated in situ. Compared with the prior art, the present invention uses the electrons generated in situ from the titanium precursors as the reducing agent. Control the hydrolysis reaction of the titanium precursor, thereby controlling the amount of subsequent photo-excited electron...

Embodiment 1

[0055] Add 112.6 mg of activated carbon produced by Cabot Company in the United States under the trade name of Vulcan XC-72R to 150 mL of absolute ethanol, disperse ultrasonically for 0.5 h, and then pass N into the activated carbon suspension 2 Deoxygenate the gas for 30 minutes; add 8mL of 3.7mol / L chloroplatinic acid aqueous solution and triethylamine to the above-mentioned deoxygenated suspension, n(triethylamine): n(chloroplatinic acid)=3, After stirring for 30 minutes, add 280 μL of isopropyl titanate, and put it under UV light for 24 hours;

[0056] Use deionized water with a resistivity of 18.2MΩ·cm to filter and wash the suspension until there is no Cl - , The obtained solid material was vacuum dried at 80° C. to obtain a platinum catalyst, and the sample was marked as sample-1.

[0057] The platinum content of the platinum catalyst prepared in Example 1 of the present invention is 13.8 wt%.

[0058] The present invention performs X-ray diffraction analysis on the Pt catalys...

Embodiment 2

[0062] This embodiment adopts the same preparation method as in embodiment 1, except that the amount of triethylamine added: n (triethylamine): n (chloroplatinic acid)=2.

[0063] The test method and experimental conditions of this example are the same as those of Example 1, and the catalyst prepared in Example 2 is marked as sample-2.

[0064] The present invention performs X-ray diffraction analysis on the Pt catalyst obtained in Example 2 according to the above technical scheme, and the test results are shown in figure 1 , figure 1 These are the X-ray diffraction (XRD) graphs of the Pt catalyst prepared in Examples 1 to 6 of the present invention and the comparative example, where curve 2 is the X-ray diffraction (XRD) curve of the Pt catalyst prepared in Example 2 of the present invention;

[0065] The present invention carries out cyclic voltammetry test on the Pt catalyst prepared in Example 2 according to the above technical scheme, and the test results are as follows image 3 ...

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Abstract

The invention provides a method for preparing a Pt catalyst, comprising the following steps: a) mixing a carbon carrier, a Pt precursor, a titanium precursor, a regulator and ethanol to obtain a mixed suspension, the regulator comprising an organic acid compound or an organic base compound; b) irradiating the mixed suspension obtained in step a) with ultraviolet light to obtain a Pt catalyst. Compared with the prior art, the present invention uses the electrons generated in situ from the titanium precursor as a reducing agent, and controls the hydrolysis reaction of the titanium precursor through a regulator, thereby controlling the amount of subsequent photoexcited electrons and the speed of electron generation, thereby controlling the nascent The deposition of Pt atoms on the carrier controls the Pt catalysts obtained with different Pt reduction degrees and shapes. Therefore, the preparation method provided by the invention can control the interface of the carbon carrier, TiO2 and Pt three phases, which is beneficial to the adjustment of the obtained Pt catalyst. electrochemical activity.

Description

Technical field [0001] The invention belongs to the technical field of catalysts, and particularly relates to a method for preparing a Pt catalyst. Background technique [0002] A fuel cell is an efficient and clean power generation system that directly and continuously converts the chemical energy contained in the fuel into electrical energy through an electrochemical reaction. Fuel cells include proton exchange membrane fuel cells (PEMFC), molten carbonate fuel cells (MCFC), and solid oxide fuel cells (SOFC). Among them, the proton exchange membrane fuel cell has the advantages of low operating temperature, high energy density, no corrosion, fast start-up, etc. It has good application prospects in portable power supplies and small power supplies. [0003] In the proton exchange membrane fuel cell, the activity and stability of the catalyst have an important influence on the performance of the cell. In the composition of the catalyst, the carrier plays a role in dispersing the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J37/16H01M4/92
CPCY02E60/50
Inventor 邢巍司凤占刘长鹏梁亮李晨阳
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI