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Catalyst and preparation method and application thereof

A catalyst, sodium borohydride technology, applied in the field of catalysis, to achieve the effect of less special equipment, improved activity, and reduced reaction activation energy

Active Publication Date: 2019-07-23
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a clear and systematic understanding of stress effects in catalytic reactions involving metal nanocatalysts is currently lacking, which limits the use of surface stress as a tool for optimizing the performance of metal nanocatalysts.

Method used

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  • Catalyst and preparation method and application thereof
  • Catalyst and preparation method and application thereof
  • Catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Dissolve chloroauric acid, sodium borohydride and cetyltrimethylammonium bromide (CTAB) in deionized water at normal temperature to obtain a mixed solution; the concentration of chloroauric acid in the mixed solution is 20mmol / L, chlorine The volume of gold acid is 0.125mL, the mass of sodium borohydride is 0.23mg, the mass of CTAB is 437.3mg, the volume of deionized water is 9.875mL, and then heated in an oil bath at a temperature of 30°C for 1h, and then The resulting product was cooled to room temperature to obtain a mixed solution of Au clusters;

[0055] At normal temperature, chloroauric acid, ascorbic acid (AA) and cetyltrimethylammonium chloride (CTAC) are dissolved in deionized water to obtain a mixed solution; the concentration of chloroauric acid in the mixed solution is 20mmol / L, The volume of chloroauric acid is 0.05mL, the mass of AA is 25mg, the mass of CTAC is 128mg, the volume of deionized water is 5.5mL, then add the Au cluster mixed solution, the volu...

Embodiment 2

[0062] Using the Au@Pd nanocube catalyst prepared in Example 1 of the present invention to carry out the catalytic performance test of the 4-nitrophenol reduction reaction, use sodium borohydride to reduce 4-nitrophenol as a model reaction to quantitatively test the performance of the Au@Pd nanocube catalyst Catalytic activity, the pure Pd nanocube catalyst of the same size and shape is used for comparison, namely the catalyst prepared in comparative example 1, the catalyst size prepared in embodiment 1 of the present invention and comparative example 1 is all 18nm, specifically:

[0063] An aqueous solution of freshly prepared 4-nitrophenol (1.4mmol / L, Aldrich, 241326) and sodium borohydride (0.42mol / L, Sigma, S9125) was mixed with 7mL deionized water in a 20mL glass vial under magnetic stirring; then , inject 1mL of the Au@Pd nanocatalyst prepared in Example 1 (3.8×10 10 particles / mL) to obtain a mixed solution. The particle concentration that the Pd nanocube catalyst (cata...

Embodiment 3

[0068] Dissolve chloroauric acid, sodium borohydride and cetyltrimethylammonium bromide (CTAB) in deionized water at normal temperature to obtain a mixed solution; the concentration of chloroauric acid in the mixed solution is 20mmol / L, chlorine The volume of gold acid is 0.125mL, the mass of sodium borohydride is 0.23mg, the mass of CTAB is 437.3mg, the volume of deionized water is 9.875mL, and then heated in an oil bath at a temperature of 30°C for 1h, and then The resulting product was cooled to room temperature to obtain a mixed solution of Au clusters;

[0069] At normal temperature, chloroauric acid, ascorbic acid (AA) and cetyltrimethylammonium chloride (CTAC) are dissolved in deionized water to obtain a mixed solution; the concentration of chloroauric acid in the mixed solution is 20mmol / L, The volume of chloroauric acid is 0.05mL, the mass of AA is 25mg, the mass of CTAC is 128mg, the volume of deionized water is 5.5mL, then add the Au cluster mixed solution, the volu...

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Abstract

The invention provides a catalyst. The catalyst comprises an Au nanosphere core and a Pd nanometer cubic shell which coats the surface of an Au nanosphere. The catalyst takes the Au nanosphere as thecore and takes a Pd nanometer cube as the shell to construct the Au@Pd nanometer catalyst with a core-shell structure, a stretching stress effect is generated on the surface of the Pd, influence of other effects such as an electronic effect can be isolated, and therefore, the reduction reaction activity of the catalyst for 4-nitrophenol is greatly improved. The catalyst provided by the invention can be used for researching the influence of the stress effect on the catalytic activity of the metal nanometer catalyst. The invention also provides a preparation method and application of the catalyst.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a catalyst and its preparation method and application. Background technique [0002] Lattice mismatch at the bimetallic interface generates surface stress. Controlling surface stress is one of the important means to control the activity of metal nanocatalysts. However, a clear and systematic understanding of stress effects in catalytic reactions involving metal nanocatalysts is lacking, which limits the use of surface stress as a tool to optimize the performance of metal nanocatalysts. Moreover, when studying the stress effect, there will be other effects (electronic effect, size effect) that interfere with the activity of the catalyst, which need to be excluded. Therefore, it is necessary to use a suitable catalyst as a template to exclude the influence of other effects to study the stress effect alone. In this catalyst, the only factor affecting the activity of the catalys...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J35/02C07C213/02C07C215/76
CPCB01J23/52C07C213/02B01J35/396B01J35/40C07C215/76
Inventor 崔一曾杰
Owner UNIV OF SCI & TECH OF CHINA