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High-activity spiral Pt-Rh alloy nanocatalyst and preparation method thereof

A technology of alloy nanometer and high activity rattan, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complicated preparation process and increase of production cost, etc. , to achieve the effect of improving anti-carbon monoxide poisoning ability, reducing economic cost and high electrocatalytic activity

Inactive Publication Date: 2015-05-13
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These operations complicate the preparation process, increase the production cost, and the distribution of the obtained alloy nanoparticles has great randomness

Method used

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  • High-activity spiral Pt-Rh alloy nanocatalyst and preparation method thereof
  • High-activity spiral Pt-Rh alloy nanocatalyst and preparation method thereof
  • High-activity spiral Pt-Rh alloy nanocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Insulin fibers with hollow helical structure

[0038] Put 0.0010g of bovine proinsulin powder in a centrifuge tube, add 1mL of freshly prepared hydrochloric acid solution with a pH of 2.0, dissolve and mix with ultrasound to obtain a 0.2mM insulin-hydrochloric acid solution, seal it with a parafilm, and dissolve the insulin-hydrochloric acid solution The solution was heated in a constant temperature metal bath at 75°C for 15 hours to obtain the insulin fiber suspension, and its appearance was observed under a transmission electron microscope as follows: figure 1 shown.

[0039] 2. Preparation of Pt-Rh alloy nanocatalyst with rattan-wrapped tree structure

[0040] Take the above 100 μL insulin fiber suspension in a centrifuge tube, add 100 μL, 1.0 mM PtCl 4 and 1.0mM RhCl 3 Mix the solution, mix well and put it into a water bath constant temperature shaker at 100rmp and incubate at 20°C for 20h. Add 150 μL of newly prepared sodium borohydride solution with a conce...

Embodiment 2

[0042] 1. Insulin fibers with hollow helical structure

[0043] Step 1 of Example 1 was repeated.

[0044] 2. Preparation of Pt-Rh alloy nanocatalyst with rattan-wrapped tree structure

[0045] Take the above 100 μL insulin fiber suspension in a centrifuge tube, add 100 μL, 2.0 mM PtCl 4 and 2.0mM RhCl 3 Mix the solution, mix well and put it into a water bath constant temperature shaker at 100rmp and incubate at 20°C for 20h. Add 150 μL of newly prepared sodium borohydride solution with a concentration of 10 mM to the above-incubated system, and add 30 μL / time with an interval of 5 min / time. After adding the reducing agent each time, ultrasonicate the reaction system once every 10s, and ultrasonicate for 2s each time. Finally, put the centrifuge tube into a shaker and incubate at 20° C. at 40 rpm for 10 h until the reaction is complete, and the rattan-wrapped tree structure Pt-Rh alloy nanocatalyst is prepared.

Embodiment 3

[0047] 1. Insulin fibers with hollow helical structure

[0048] Put 0.0015g of bovine proinsulin powder in a centrifuge tube, add 1mL of freshly prepared hydrochloric acid solution with a pH of 1.8, dissolve and mix with ultrasound to obtain a 0.3mM insulin-hydrochloric acid solution, seal it with a parafilm, and dissolve the insulin-hydrochloric acid solution The solution is placed in a constant temperature metal bath at 80°C and heated for 10 hours to obtain an insulin fiber suspension with a hollow helical structure.

[0049] 2. Preparation of Pt-Rh alloy nanocatalyst with rattan-wrapped tree structure

[0050] Take the above 100 μL insulin fiber suspension in a centrifuge tube. Add 100 μL of 2.0 mM PtCl 4 and 1.0mM RhCl 3 Mix the solution, mix well and put it into a constant temperature shaker in a water bath at 120rmp and incubate at 25°C for 15h. Add 120 μL of newly prepared sodium borohydride solution with a concentration of 10 mM to the above-incubated system, addi...

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Abstract

The invention discloses a high-activity spiral Pt-Rh alloy nanocatalyst which is structurally characterized in that a Pt-Rh nanowire forms a framework in the middle, does not have branches, and has the uniform diameter of 1.5-2 nm and the length of a few micrometers; Pt-Rh alloy nanoparticles spirally surround the periphery of the nanowire framework in an axial direction, are distributed orderly and have the uniform sizes of 2-3 nm. A preparation method for the high-activity spiral Pt-Rh alloy nanocatalyst mainly comprises the following steps: taking a hollow spiral insulin fiber obtained after treatment of raw insulin powder as a control template, performing co-hatching on the insulin fiber and a mixed water solution of platinum chloride and rhodium chloride, and performing ultrasonic-assisted co-reduction treatment to prepare the high-activity spiral Pt-Rh alloy nanocatalyst. The nanocatalyst combines the advantages of the nanowire and the nanoparticles and has very high electrocatalytic activity and anti-carbon monoxide poisoning capability; the preparation method is low in preparation cost, environment-friendly, efficient, free of other chemical stabilizers and carriers, simple in preparation process, mild in reaction condition and high in product morphology repeatability.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof. Background technique [0002] In recent years, in order to improve the catalytic performance of noble metal Pt catalysts and reduce the cost of catalysts, the preparation and performance research of Pt-based alloys has attracted widespread attention of scientists. The study found that by adding other platinum group metals (such as Au, Rh, Pd, Ru, etc.) and transition metals M (Fe, Cr, Mn, Co, Ni, Ti, and Zr, etc.) Elementary and ternary alloy catalysts have higher electrocatalytic activity and stability than single metal Pt due to the catalytic mechanism of synergistic effect. It can not only reduce the consumption of Pt, that is, directly reduce the cost of the catalyst, but also improve the anti-poisoning ability of the catalyst by intermediate oxides (such as carbon monoxide), and prolong the service life of the catalyst. [0003] The catalytic performance of Pt-based alloy cata...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J35/02H01M4/92
CPCY02E60/50
Inventor 侯莉仝丹丹姜洋牛云凤高发明
Owner YANSHAN UNIV
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