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Nanogold confinement copper-based core-shell structure catalyst as well as preparation method and application thereof

A core-shell structure and nano-gold technology, applied in the preparation of hydroxyl compounds, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of easy loss of active components and poor catalyst stability

Active Publication Date: 2021-12-21
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a nano-gold confinement copper-based core-shell structure catalyst and its preparation method and application, thereby effectively solving the existing copper-based catalyst in formaldehyde Problems such as poor catalyst stability and easy loss of active components in ethynylation reaction

Method used

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  • Nanogold confinement copper-based core-shell structure catalyst as well as preparation method and application thereof
  • Nanogold confinement copper-based core-shell structure catalyst as well as preparation method and application thereof
  • Nanogold confinement copper-based core-shell structure catalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Weigh 0.05g of chloroauric acid and dissolve it in water to prepare 500 mL of chloroauric acid aqueous solution, and the mass concentration of chloroauric acid is controlled at 0.1 g / L; weigh 0.05 g of sodium citrate and dissolve it in water to prepare 10 mL of sodium citrate aqueous solution, the mass concentration of sodium citrate was controlled at 5 g / L; the prepared 500 mL chloroauric acid aqueous solution was heated and boiled in a microwave oven, and 4 mL sodium citrate aqueous solution was quickly added, and kept boiling for 10 min, until it dropped to After room temperature, the gold sol solution was obtained.

[0035] Weigh 18.2 g copper nitrate trihydrate, 10.85 g ferric nitrate nonahydrate, 6.06 g sodium lauryl sulfate and 3.03 g PVP, dissolve them in distilled water together, and control the mass concentration of 1 L copper at 4.79 g / L. The mass concentration of iron is controlled at 1.5 g / L, the mass concentration of sodium lauryl sulfate is controlled at ...

Embodiment 2

[0038] Weigh 0.06 g of chloroauric acid and dissolve it in water to prepare 300 mL of chloroauric acid aqueous solution. The mass concentration of chloroauric acid is controlled at 0.2 g / L; weigh 0.08 g of sodium citrate and dissolve it in water to prepare 10 mL of sodium citrate Aqueous solution, the mass concentration of sodium citrate was controlled at 8 g / L; 300 mL of chloroauric acid aqueous solution was heated and boiled in a microwave oven, and 3.3 mL of sodium citrate aqueous solution was added quickly, and kept boiling for 20 min. After room temperature, the gold sol solution was obtained.

[0039] Weigh 23.7 g copper nitrate trihydrate, 3.62 g ferric nitrate nonahydrate, 7.89 g sodium lauryl sulfate and 5.26 g PVP, dissolve them in distilled water together, and control the mass concentration of 1 L copper at 6.23 g / L. The mass concentration of iron is controlled at 0.5 g / L, the mass concentration of sodium lauryl sulfate is controlled at 7.89 g / L, and the mass concen...

Embodiment 3

[0042] Weigh 0.015 g of chloroauric acid and dissolve it in water to prepare 150 mL of chloroauric acid aqueous solution. The mass concentration of chloroauric acid is controlled at 0.1 g / L; weigh 0.10 g of sodium citrate and dissolve it in water to prepare 10 mL of sodium citrate aqueous solution, the mass concentration of sodium citrate was controlled at 10 g / L; heat and boil the prepared 150 mL chloroauric acid aqueous solution in a microwave oven, and quickly add 2.7 mL sodium citrate aqueous solution, keep boiling for 30 min, and wait until it drops to After room temperature, the gold sol solution was obtained.

[0043] Weigh 27.9 g copper nitrate trihydrate, 2.17 g ferric nitrate nonahydrate, 9.30 g sodium lauryl sulfate and 2.33 g PVP, dissolve them in distilled water together, and control the mass concentration of 1 L copper at 7.33 g / L. The mass concentration of iron is controlled at 0.3 g / L, the mass concentration of sodium lauryl sulfate is controlled at 9.30 g / L, a...

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Abstract

The invention relates to a nanogold confinement copper-based core-shell structure catalyst and a preparation method and application thereof, and the catalyst is composed of a Cu2C2-FexOy shell layer of 15 nm to 93 nm, a nanogold core of 12 nm to 55 nm and an extended PVP long chain. The method comprises the steps: adding the sodium citrate aqueous solution into a heated and boiled chloroauric acid aqueous solution, and carrying out reacting to obtain a gold sol solution; dissolving copper salt, ferric salt, lauryl sodium sulfate and PVP in deionized water completely, and adding the gold sol solution to obtain a mixed solution; then dropwise adding sodium hydroxide and a reducing agent solution into the mixed solution, washing and drying the obtained precipitate to obtain an Au-coated Cu2O-FexOy core-shell structure nano material, putting the core-shell structure nano material into an aqueous solution of polyformaldehyde and gamma-butyrolactone, exhausting air in a reaction bottle, switching to acetylene gas, and carrying out treating at an activation temperature; obtaining the Au-coated Cu2C2-FexOy catalyst after precipitate obtained through centrifugal separation is dried; in the catalytic reaction process, the electronic effect and the geometric effect of the catalyst can be improved, and the catalytic activity and the stability are improved.

Description

technical field [0001] The invention relates to a core-shell structure catalyst, in particular to a novel nano-gold confined copper-based core-shell structure catalyst and a preparation method thereof, as well as the application of the catalyst in the acetylene synthesis of formaldehyde to 1,4-butynediol. Background technique [0002] 1,4-Butynediol (BD) is an important intermediate of organic chemical raw materials, through simple chemical transformation can be obtained such as 1,4-butanediol (BDO), tetrahydrofuran and γ-butyrolactone Value-added derivatives, and further extended downstream to produce polytetramethylene ether glycol (PTMEG), polybutylene terephthalate (PBT), polybutylene adipate terephthalate (PBAT ), polybutylene succinate (PBS) and other polymer materials, involving all aspects of the national economy and people's livelihood. [0003] Industrially, 1,4-butynediol is mainly prepared from formaldehyde and acetylene by the Reppe method, catalyzed by copper ...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J23/89B01J35/02C07C33/046C07C29/42
CPCB01J27/22B01J23/8926C07C29/42B01J35/396B01J35/50C07C33/046Y02P20/584Y02P20/52
Inventor 李海涛黄鑫赵永祥王浩张因
Owner SHANXI UNIV
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