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A kind of nanometer gold micelle catalyst and its preparation method and application

A nano-gold and catalyst technology, applied in the field of nano-gold micelle catalyst and its preparation, can solve the problem of lack of efficient catalysts for fatty acid esters, and achieve the effects of good catalytic oxidation performance, high ester yield and good dispersion.

Active Publication Date: 2022-08-05
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of the lack of high-efficiency catalysts for the preparation of fatty acid esters by the water-phase conversion of bio-based fatty alcohols, the present invention provides a nano-gold micelle catalyst and its preparation method and application

Method used

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  • A kind of nanometer gold micelle catalyst and its preparation method and application
  • A kind of nanometer gold micelle catalyst and its preparation method and application
  • A kind of nanometer gold micelle catalyst and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1. Preparation method of nano-gold micelle catalyst.

[0024] (1) HAuCl 4 Aqueous solution (20mL, 0.79mg, 2.0mmol) and mPEG-SH aqueous solution (20mL, 0.56g, 4.8mmol) were mixed, and stirred at 800rpm for 40min at 25°C to obtain a mixed solution;

[0025] (2) To the mixed solution obtained in step (1), add NaBH dropwise 4 Aqueous solution (100mM, 0.4mL) was added dropwise while stirring, and reacted for 18h to obtain a wine red mPEGylated Au-NPs solution;

[0026] (3) The mPEGylated Au-NPs solution obtained in step (2) was centrifuged at 8000 r / min for 30 min to remove any unbound thiol, and the obtained supernatant was the nano-gold micelle catalyst.

[0027] The schematic diagram of the synthesis of mPEGylated Au-NPs is shown in Fig. image 3 shown. The mPEGylated Au-NPs prepared in Example 1 was subjected to a SEM scanning test, and the test results were as follows figure 1 shown. Depend on figure 1 It can be seen that the catalyst has uniform micellar...

Embodiment 2

[0029] Example 2. Preparation method of nano-gold micelle catalyst.

[0030] (1) HAuCl 4 Aqueous solution (20mL, 0.40mg, 1.0mmol) and mPEG-SH aqueous solution (20mL, 0.23g, 2.0mmol) were mixed, and stirred at 1000rpm for 50min at 30°C to obtain a mixed solution;

[0031] (2) To the mixed solution obtained in step (1), add NaBH dropwise 4 Aqueous solution (200mM, 0.4mL) was added dropwise while stirring, and reacted for 12h to obtain a wine red mPEGylated Au-NPs solution;

[0032] (3) The mPEGylated Au-NPs solution obtained in step (2) was centrifuged at 10,000 r / min for 40 min to remove any unbound thiol, and the obtained supernatant was the nano-gold micelle catalyst.

Embodiment 3

[0033] Example 3. Preparation method of nano-gold micelle catalyst.

[0034] (1) HAuCl 4 Aqueous solution (20mL, 3.95mg, 10.0mmol) and mPEG-SH aqueous solution (20mL, 1.15g, 10.0mmol) were mixed, and stirred at 500rpm for 30min at 20°C to obtain a mixed solution;

[0035] (2) To the mixed solution obtained in step (1), add NaBH dropwise 4 Aqueous solution (300mM, 0.4mL) was added dropwise while stirring, and reacted for 24h to obtain a wine red mPEGylated Au-NPs solution;

[0036] (3) The mPEGylated Au-NPs solution obtained in step (2) was centrifuged at 12000 r / min for 60 min to remove any unbound thiol, and the obtained supernatant was the nano-gold micelle catalyst.

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Abstract

A nano-gold micelle catalyst and a preparation method and application thereof belong to the technical field of nano-gold micelle catalysts. In order to solve the problem of lack of efficient catalysts for the preparation of fatty acid esters by water-phase conversion of bio-based fatty alcohols, the present invention provides a nano-gold micelle catalyst and a preparation method and application thereof. The preparation method of the nano-gold micelle catalyst of the present invention is as follows: 4 The aqueous solution and the mPEG-SH aqueous solution were mixed, stirred at 20-30°C for 30-50 min at 500-1000 rpm, and then NaBH was added dropwise to it 4 The aqueous solution was added dropwise while stirring, and the reaction was carried out for 12-24 h to obtain the mPEGylated Au-NPs solution and centrifuged, and the obtained supernatant was the nano-gold micelle catalyst. The nano-gold micelle catalyst of the present invention can realize high-efficiency catalytic water-phase oxidation of fatty alcohol to prepare fatty acid ester.

Description

technical field [0001] The invention relates to the technical field of nano-gold micelle catalyst, in particular to a nano-gold micelle catalyst and a preparation method and application thereof. Background technique [0002] Self-esterification of fatty alcohols, i.e. oxidative esterification of alcohols, is a better means of producing fine chemicals and intermediates. To date, the development of economical and green oxidants for the synthesis of esters from fatty alcohols has been considered a hot research topic. However, the self-esterification of aliphatic alcohols to esters in water remains a challenge due to the increasing demand for biological substrates and green chemical transformations. The development of high-efficiency aqueous oxidative esterification catalysts for fatty alcohols is an important bottleneck to realize the aqueous phase conversion of bio-based fatty alcohols to prepare fatty acid esters. At present, there is no report on the preparation of fatty al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J35/02C07C67/40C07C69/24B01J35/00
CPCB01J23/52C07C67/40B01J35/23B01J35/40C07C69/24
Inventor 冯德鑫安东梁凤兵
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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