A kind of bimetallic alloy-halloysite composite catalyst and its preparation method and application

A composite catalyst and bimetallic technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., can solve the problem of unfavorable exposure of metal surface catalytic active centers and catalyst preparation process Complexity and other issues, to achieve the effect of easy recycling and reuse, simple preparation method and application process, and high dispersion

Active Publication Date: 2021-10-15
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of the catalyst uses a hydrothermal method to simultaneously synthesize manganese dioxide carrier and palladium particles, but the low dispersion of manganese dioxide causes some palladium particles to be covered by manganese dioxide, which is not conducive to exposing more catalytic active centers on the metal surface
Chinese invention patent "Catalyst for the preparation of 2,5-furandicarboxylic acid and method for preparing 2,5-furandicarboxylic acid using the catalyst" (publication number: CN108712931A) discloses a spinel-type oxide carrier-supported noble metal catalyst And be used in the method for preparing 2,5-FDCA by catalytic oxidation of 5-HMF, but the preparation process of this catalyst is complicated

Method used

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  • A kind of bimetallic alloy-halloysite composite catalyst and its preparation method and application
  • A kind of bimetallic alloy-halloysite composite catalyst and its preparation method and application
  • A kind of bimetallic alloy-halloysite composite catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Mix 40mL of 3-aminopropyltrimethoxysilane and 360mL of ethanol uniformly to obtain a mixed solution, then add 40g of halloysite to the above mixed solution, and 100W ultrasonic 2h to obtain a uniform suspension of halloysite;

[0031] (2) Stir and reflux the halloysite suspension obtained in step (1) for 24h at 80°C, then centrifuge at 4000rpm for 10min to separate, keep the solid, then dry at 50°C for 12h, manually grind and pass through a 100-mesh sieve Net, get modified halloysite;

[0032] (3) Add 20g of the modified halloysite obtained in step (2) to 2000mL of water, 100W ultrasonic 2h to make it uniformly dispersed, then add 242mL of sodium chloroplatinate aqueous solution with a concentration of 10mg / mL and 43mL of 10mg / mL Aqueous sodium chloroaurate solution, and stirred at room temperature for 24h, obtained the suspension of double metal ion-halloysite complex;

[0033] (4) Finally, add 10 g of gallic acid to the suspension of the double metal ion-halloysi...

Embodiment 2

[0037] (1) Mix 100mL of 3-aminopropyltriethoxysilane and 500mL of ethanol uniformly to obtain a mixed solution, then add 12g of halloysite to the above mixed solution, and 100W ultrasonic for 0.5h to obtain a uniform suspension of halloysite;

[0038] (2) Stir and reflux the halloysite suspension obtained in step (1) for 18 hours at 100°C, then centrifuge at 4000rpm for 10 minutes to separate, retain the solid, then dry at 150°C for 4 hours, manually grind and pass through a 100-mesh sieve Net, get modified halloysite;

[0039] (3) Add 10g of the modified halloysite obtained in step (2) to 500mL of water, 100W ultrasonic 0.5h to make it uniformly dispersed, then add 26mL of chloroplatinic acid aqueous solution with a concentration of 5mg / mL and 26mL with a concentration of 5mg / mL Chlorauric acid aqueous solution, and stirred at room temperature 12h, obtains the suspension of double metal ion-halloysite complex;

[0040] (4) Finally, 6 g of sodium borohydride was added to the ...

Embodiment 3

[0044] (1) Mix 10mL of 3-aminopropyltriethoxysilane and 1000mL of toluene uniformly to obtain a mixed solution, then add 25g of halloysite to the above mixed solution, and 100W ultrasonic for 2h to obtain a uniform suspension of halloysite;

[0045] (2) Stir and reflux the halloysite suspension obtained in step (1) for 12 hours at 120°C, then centrifuge at 4000rpm for 10 minutes to separate, retain the solid, then dry at 100°C for 10 hours, manually grind and pass through a 100-mesh sieve Net, get modified halloysite;

[0046] (3) Add 15g of the modified halloysite obtained in step (2) to 3000mL of water, 100W ultrasonic 2h to make it evenly dispersed, then add 38mL of potassium chloroplatinate aqueous solution with a concentration of 1mg / mL and 116mL with a concentration of 1mg / mL Potassium chloroaurate aqueous solution, and stirred at room temperature 18h, obtains the suspension of double metal ion-halloysite complex;

[0047] (4) Finally, 7g of ascorbic acid was added to t...

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Abstract

The invention discloses a bimetallic alloy-halloysite composite catalyst, a preparation method and application thereof. The present invention immerses the modified tubular halloysite in a mixed solution of platinum and gold precursors, and prepares a catalyst of bimetallic alloy nanoparticles uniformly loaded with platinum and gold inside and outside the halloysite tube through an in-situ reduction method; The bimetallic alloy nanoparticles supported by the catalyst exhibit high dispersion and excellent alloy effect, and can efficiently catalyze the oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA), and The yield of FDCA is as high as 95% or more; at the same time, the catalyst uses cheap and stable tubular halloysite as a carrier, which is beneficial to the recovery and reuse of the catalyst and reduces the cost; in addition, the preparation method of the catalyst has the advantages of simple process and mild conditions. It has broad application prospects in the field of catalytic oxidation of HMF to prepare FDCA.

Description

technical field [0001] The invention belongs to the technical field of synthesis of organic chemical products, and in particular relates to a bimetallic alloy-halloysite composite catalyst and its preparation method and application. Background technique [0002] With the continuous reduction of non-renewable fossil energy such as coal, oil, and natural gas, and the increasing demand for fossil energy in society, it is imminent to find alternative energy. Biomass energy is considered as an alternative energy source with great potential because of its wide sources, abundant reserves, renewable, and cheap characteristics. 5-Hydroxymethylfurfural (HMF) is a carbohydrate derived from biomass and can be converted into a variety of high value-added chemicals and fuels. Among them, the catalytic oxidation of HMF to prepare 2,5-furandicarboxylic acid (FDCA) has attracted much attention. FDCA is an important intermediate in organic synthesis, and was listed as one of the 12 most pot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J35/10B01J37/16B01J37/34C07D307/68B82Y30/00B82Y40/00
CPCB01J23/52B01J35/0066B01J35/10B01J37/16B01J37/343B82Y30/00B82Y40/00C07D307/68Y02P20/584
Inventor 袁鹏钟雪敏邓亮亮刘冬
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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