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Preparation method of Pt-Ru alloy catalyst with high catalytic activity

A high catalytic activity, alloy catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the limitation of single metal Pt application, expensive, poisoning, etc. question

Inactive Publication Date: 2014-07-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Pt particles are prone to agglomeration and carbon poisoning: the adsorption of CO on the surface of the catalyst is much stronger than that of hydrogen, so the active sites for adsorbing hydrogen on the catalyst will be occupied by CO, which hinders the electrooxidation of hydrogen. The experimental results showed that even at concentrations of CO in hydrogen as low as 10 -5 It will also lead to serious anode polarization, which will seriously reduce the performance of the battery, and the high price of Pt metal, due to the existence of the above reasons, severely limits the application of single metal Pt in catalysts.

Method used

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  • Preparation method of Pt-Ru alloy catalyst with high catalytic activity
  • Preparation method of Pt-Ru alloy catalyst with high catalytic activity
  • Preparation method of Pt-Ru alloy catalyst with high catalytic activity

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1). Take a certain quality of chloroplatinic acid (H 2 PtCl 6 ·6H 2 O), hydrated ruthenium trichloride (RuCl 3 ·nH 2 O, the mass fraction of Ru is 40%), amphiphilic block copolymer P123 (EO 20 PO 70 EO 20 ), deionized water, absolute ethanol:

[0026]

[0027] (2). First add ethanol to the amphiphilic block copolymer P123 (EO 20 PO 70 EO 20 ), then add deionized water, and mix thoroughly at 25°C. After P123 is completely dissolved and fully mixed, the mixed solution is added to chloroplatinic acid (H 2 PtCl 6 ·6H 2 O), hydrated ruthenium trichloride (RuCl 3 ·nH 2 (0) in the mixture, leave standstill after mixing evenly, treat that ethanol is all volatilized;

[0028] (3). Lyotropic liquid crystals are formed after ethanol is completely volatilized, and 0.1mol / L ascorbic acid aqueous solution is prepared. This solution will be used as a reducing agent for the reaction. Take 5mL reducing agent and add it to the lyotropic liquid crystal, and reduce it in ...

Embodiment 2

[0035] The preparation method of the Pt-Ru alloy catalyst of high catalytic activity, step is with embodiment 1, and difference is that the hydrated ruthenium trichloride (RuCl 3 ·nH 2 O) The mass is 0.016g.

[0036] image 3 Shown is the Pt-Ru alloy catalyst of the high catalytic activity prepared by example 2 at 0.5mol / LH 2 SO 4 +1mol / L CH 3 The cyclic voltammetry curve in the solution of OH, it can be seen from the figure that the peak current density at 0.67 V is 202mA / mg, compared with the peak current density (about 100mA / mg) of commercial platinum black increase; and, the peak current density I of the positive potential scan a Peak current density I b The ratio is 1.15, indicating that the as-prepared Pt catalyst is comparable to commercial platinum black (I a / I b =0.85-0.95) has higher anti-toxin performance.

[0037] Figure 4 Shown is the Pt-Ru alloy catalyst of the high catalytic activity prepared by example 2 at 0.5mol / LH 2 SO 4 The cyclic voltammetry ...

Embodiment 3

[0039] The preparation method of the Pt-Ru alloy catalyst of high catalytic activity, step is with embodiment 1, and difference is that the hydrated ruthenium trichloride (RuCl 3 ·nH 2 O) Mass is 0.024g.

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Abstract

The invention provides a preparation method of a Pt-Ru alloy catalyst with high catalytic activity. According to the preparation method, Pt and Ru of the alloy catalyst come from chloroplatinic acid and rutheniumchloride hydrate respectively; lyotropic liquid crystals are formed from Pt and Ru with amphipathic segmented copolymer P123, water, and ethanol; ascorbic acid is taken as a reducing agent for reduction via ultrasonic water bath; and the Pt-Ru alloy catalyst with high catalytic activity is obtained via washing, centrifugation, and roasting. Catalytic activity and poison resistance of the Pt-Ru alloy catalyst with high catalytic activity obtained via the preparation method are higher than that of commercial Pt black catalyst.

Description

technical field [0001] The invention relates to a preparation method of a Pt-Ru alloy catalyst with high catalytic activity, belonging to the technical field of Pt-based alloy catalysts. Background technique [0002] In today's era, energy issues have become one of the challenges faced by countries all over the world. Many new high-energy and high-efficiency energy storage and conversion technologies, such as solar cells, fuel cells, supercapacitors, etc., as well as various catalyst materials and electrode materials with high catalytic activity, have been widely concerned by scientists and have made good research progress to a certain extent. . Among many new energy topics, direct methanol fuel cells have aroused great interest of scientists due to their high energy output and no harmful by-products. Platinum is a noble metal element with high chemical stability and catalytic activity. In the field of electrochemical catalysis, Pt has very good catalytic activity performa...

Claims

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Application Information

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IPC IPC(8): B01J23/46
Inventor 徐联宾赵高斌陈建峰张程伟
Owner BEIJING UNIV OF CHEM TECH
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