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Cobalt-manganese hydrotalcite-supported nanometer gold catalyst and preparation method thereof

A technology of hydrotalcite and catalyst, which is applied in the field of electrocatalyst to achieve the effects of high stability, uniform distribution and high sensitivity

Active Publication Date: 2014-07-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CoMn-LDHs composed of double transition metal elements have not been reported to support nano-gold catalysts.

Method used

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  • Cobalt-manganese hydrotalcite-supported nanometer gold catalyst and preparation method thereof
  • Cobalt-manganese hydrotalcite-supported nanometer gold catalyst and preparation method thereof
  • Cobalt-manganese hydrotalcite-supported nanometer gold catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Carrier Co 3 Preparation of Mn-LDHs

[0021] 3:1 cobalt-manganese hydrotalcite was prepared by nucleation crystallization isolation method, and 4.3658g Co(NO 3 ) 2 ·6H 2 O and 1.7895gMn(NO 3 ) 2 (49%~51%) dissolved in 100mL deionized water to make a mixed salt solution, weigh 1.28g NaOH and 1.06g NaOH 2 CO 3 Dissolve in 100mL deionized water to make a mixed alkali solution. Add the two mixed solutions into the fully back-mixed liquid membrane reactor at the same time, react for 2 minutes, transfer the obtained mixed slurry to a three-necked flask with constant temperature and vigorously stir, crystallize at 30°C for 5 hours, take out the slurry, and wash it with deionized water until the pH is 7 , dried at 50°C for 12 hours to obtain Co 3 Mn-LDHs.

[0022] 2.Co 3 Preparation of Mn-LDHs / AuNPs catalyst

[0023] Take 1mg Co 3 Mn-LDHs powder was dispersed in 1 mL of 2:1 (v / v) isopropanol:water mixed solution and ultrasonically dispersed for 2 hours to obtain ...

Embodiment 2

[0027] 1. Carrier Co 2 Preparation of Mn-LDHs

[0028]2:1 cobalt-manganese hydrotalcite was prepared by nucleation crystallization isolation method, and 38.809g Co(NO 3 ) 2 ·6H 2 O and 23.86g Mn(NO 3 ) 2 (49%~51%) dissolved in 200mL deionized water to make a mixed salt solution, weigh 8g NaOH and 21.2g NaOH 2 CO 3 Dissolve in 200mL deionized water to make a mixed alkali solution. Add the two mixed solutions into the total back-mixed liquid membrane reactor at the same time, react for 1min, transfer the obtained mixed slurry to a three-necked flask with constant temperature and vigorously stir, crystallize at 20°C for 10 hours, take out the slurry, and wash it with deionized water until the pH is 7.1 , dried at 100°C for 24 hours to obtain Co 2 Mn-LDHs.

[0029] 2.Co 2 Preparation of Mn-LDHs / AuNPs catalyst

[0030] Take 2mg Co 2 Mn-LDHs powder was dispersed in 1 mL of 3:1 (v / v) isopropanol:water mixed solution and ultrasonically dispersed for 3 hours to obtain 2 mg / ...

Embodiment 3

[0034] 1. Carrier Co 4 Preparation of Mn-LDHs

[0035] 4:1 cobalt-manganese hydrotalcite was prepared by nucleation crystallization isolation method, and 23.2824g Co(NO 3 ) 2 ·6H 2 O and 3.579g Mn(NO 3 ) 2 (49%~51%) dissolved in 200mL deionized water to make a mixed salt solution, weigh 12g NaOH and 2.12g NaOH 2 CO 3 Dissolve in 200mL deionized water to make a mixed alkali solution. Add the two mixed solutions into the total back-mixed liquid membrane reactor at the same time, react for 2 minutes, transfer the obtained mixed slurry to a three-necked flask with constant temperature and vigorously stir, crystallize at 50°C for 6 hours, take out the slurry, and wash it with deionized water to the pH of the supernatant is 7.5, dried at 60°C for 18 hours to obtain Co 4 Mn-LDHs.

[0036] 2.Co 4 Preparation of Mn-LDHs / AuNPs catalyst

[0037] Take 6mg Co 4 Mn-LDHs powder was dispersed in 2 mL of 4:1 (v / v) isopropanol:water mixed solution and ultrasonically dispersed for 4 ...

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Abstract

The invention discloses a cobalt-manganese hydrotalcite-supported nanometer gold catalyst and a preparation method thereof, and belongs to the technical field of an electro-catalyst. The catalyst comprises the chemical component, CoMn-LDHs / AuNPs, wherein AuNPs is gold nano particles with the size of 7.2nm-13.8nm, and CoMn-LDHs is cobalt-manganese hydrotalcite. The preparation method of the catalyst comprises the following steps: preparing cobalt-manganese hydrotalcite with a carbonate intercalation layer by a nucleation crystallization separation method; coating a metal indium-tin oxide (ITO) conductive glass electrode with dispersion liquid droplets to prepare a cobalt-manganese hydrotalcite-modified conductive glass electrode; carrying out electrochemical reduction on the cobalt-manganese hydrotalcite / ITO conductive glass work electrode to prepare the gold nano particles in a phosphate buffer solution containing tetrachloroauric acid. The prepared cobalt-manganese hydrotalcite-supported nanometer gold catalyst has the advantages of uniform gold nano particle distribution, high stability, and high electrocatalytic oxidation hydrogen peroxide sensitivity.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysts, and in particular relates to a cobalt-manganese hydrotalcite-supported nano-gold catalyst and a preparation method thereof. The preparation composition is a CoMn-LDHs / AuNPs catalyst. Background technique [0002] Due to their high catalytic efficiency and strong selectivity, noble metal nanomaterials are popular solid catalysts. However, due to the fact that noble metal nanomaterials are easy to agglomerate during the preparation process, their poor dispersion and poor stability lead to a decrease in their catalytic performance, which inhibits the development of noble metals to a certain extent. Catalyst Development. The development of supports to prepare supported noble metal catalysts is to stabilize monodisperse noble metal nanoparticles (NPs) by introducing foreign species. [0003] Layered double hydroxide (LDHs for short, commonly known as hydrotalcite) is a classic layered struct...

Claims

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Application Information

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IPC IPC(8): B01J23/89
Inventor 陈旭林有芹杨文胜
Owner BEIJING UNIV OF CHEM TECH
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