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Au75Pd25 icosahedron nanocrystal with twin boundaries as well as preparation method and application of Au75Pd25 icosahedron nanocrystal

A technology of nanocrystals and icosahedrons, applied in the field of Au75Pd25/C bimetallic nanocatalysts, can solve problems such as synthesis difficulties, achieve broad application prospects, improve performance, and achieve uniform scale effects

Active Publication Date: 2015-04-08
INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strict requirements on crystal morphology, the synthesis is difficult, so there is no report on the introduction of nanocrystals containing twin boundaries to solve the problems of activity and selectivity in the oxidation of cyclohexane

Method used

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  • Au75Pd25 icosahedron nanocrystal with twin boundaries as well as preparation method and application of Au75Pd25 icosahedron nanocrystal
  • Au75Pd25 icosahedron nanocrystal with twin boundaries as well as preparation method and application of Au75Pd25 icosahedron nanocrystal
  • Au75Pd25 icosahedron nanocrystal with twin boundaries as well as preparation method and application of Au75Pd25 icosahedron nanocrystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this example, Au with twin grain boundary is prepared according to the following steps 75 PD 25 Icosahedral nanocrystals:

[0024] At room temperature, 0.75mL of 20mmol / L HAuCl 4 Aqueous solution, 2.5mL palladium acetylacetonate aqueous solution with a concentration of 2mmol / L, 150mg polyvinylpyrrolidone, 0.05mL potassium iodide aqueous solution with a concentration of 10mmol / L and 10mL N,N-dimethylformamide were added to a 20mL glass bottle, and then Put it in an ultrasonic instrument and sonicate for 2 minutes to mix the raw materials evenly, and place the obtained 20mL glass bottle containing the homogeneous mixture in an oil bath, and react at 140°C for 4h;

[0025] After the reaction of the homogeneous mixture is finished, it is cooled to room temperature, and centrifuged at 52,000 rpm for 15 minutes in an ultracentrifuge, and the centrifuged product is washed 4 times with ethanol solvent to wash away the polyethylene attached to the surface of the nanocrystal...

Embodiment 2

[0029] Preparation of Au for Catalytic Oxidation of Cyclohexane 75 PD 25 / C bimetallic nanocatalyst:

[0030] The Au prepared by embodiment 1 75 PD 25 2 mg of icosahedral nanocrystals was dissolved in 2 mL of ethanol to obtain a nanocrystal solution with a concentration of 1 mg / mL. In order to make the final product Au 75 PD 25 The mass fraction is 1.0%. Take 340 μL of this solution and inject it into 100 mL of carbon black ethanol solution with a concentration of 0.34 mg / mL. After ultrasonication for 3 hours and stirring for 12 hours, centrifuge, wash with deionized water, and dry at 70°C for 2 hours. The product Au 75 PD 25 / C bimetallic nanocatalyst, resulting product Au 75 PD 25 Au in / C bimetallic nanocatalyst 75 PD 25 The mass fraction is 1.0%.

Embodiment 3

[0032] In order to compare the difference in catalytic performance, this example prepares Au without twin boundaries according to the following steps 75 PD 25 Octahedral nanocrystals and octahedral Au based on them 75 PD 25 / C Catalyst:

[0033] At room temperature, 0.75mL of 20mmol / L HAuCl 4 Aqueous solution, 2.5mL palladium acetylacetonate aqueous solution with a concentration of 2mmol / L, 150mg polyvinylpyrrolidone, 0.2mL potassium iodide aqueous solution with a concentration of 10mmol / L and 10mL N,N-dimethylformamide were added to a 20mL glass bottle, and then Place it in an ultrasonic instrument for 2 minutes and sonicate the raw materials to mix them evenly, and place the obtained 20mL glass bottle containing the homogeneous mixture in an oil bath, and react at 140°C for 4h;

[0034] After the reaction of the homogeneous mixture is finished, it is cooled to room temperature, and centrifuged at 52,000 rpm for 15 minutes in an ultracentrifuge, and the centrifuged produc...

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Abstract

The invention discloses Au75Pd25 icosahedron nanocrystal with twin boundaries as well as a preparation method and application of the Au75Pd25 icosahedron nanocrystal. The Au75Pd25 icosahedron nanocrystal is characterized by comprising 30 twin boundaries and 20 {111} crystal surfaces, wherein an Au75Pd25 / C double-metal nano catalyst prepared by loading Au75Pd25 icosahedron nanocrystal on carbon black can be used for catalyzing cyclohexane oxidation. Compared with other conventional catalysts, the synthesized catalyst is uniform in size, shows very excellent properties in catalyzing cyclohexane oxidation, and has very wide application prospect in the field of cyclohexane catalytic oxidation as the conversion rate of cyclohexane when oxidized into cyclohexanol and cyclohexanone and the selectivity is as high as 100%.

Description

technical field [0001] The invention belongs to the technical fields related to the synthesis of noble metal nanoparticles, energy and catalysis, in particular to Au with twin boundaries 75 PD 25 Preparation method of icosahedral nanocrystals and Au prepared therefrom 75 PD 25 / C bimetallic nanocatalyst. Background technique [0002] Cyclohexane oxidation is an important industrial reaction, and cyclohexanone and cyclohexanol in the reaction products are important raw materials and precursors in many organic reactions, especially in the polymer industry. For example, they can be used as key precursors for the synthesis of nylon 6 and nylon 6,6, which will consume millions of tons of cyclohexanol and cyclohexanone every year. As we all know, in this reaction, molecular oxygen is the most effective, most economical, and most environmentally feasible oxidant. However, considering the O 2 The bond length is 121pm, and the bond energy is 498kJ / mol. Its molecular structure i...

Claims

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Application Information

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IPC IPC(8): C30B29/52C30B7/14B01J23/52C07C27/12C07C29/50C07C35/08C07C45/33C07C49/403
CPCB01J23/52C07C29/50C07C45/33C07C2601/14C30B7/14C30B29/52C07C35/08C07C49/403
Inventor 王梁炳王梦琳李旭曾杰
Owner INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
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