Magnetic nanogold catalyst for synthesis of ester through one-step oxidative esterification of aldehydes as well as preparation method and application of catalyst

A technology of magnetic nanometer and gold catalyst, which is applied in the direction of aldehyde redox preparation, organic compound preparation, catalyst activation/preparation, etc. It can solve the problems of weak alkalinity, unfavorable, and small amount of active oxygen, and achieve the goal of alkalinity and active oxygen The effect of increasing the content, improving the reaction performance and improving the catalytic activity

Active Publication Date: 2018-03-23
山东达民化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, ferric oxyhydroxide, ferric oxide, and cerium oxide are used as carriers, and the carrier has weak alkalinity, and the amount of active oxygen provided is small, which is not conducive to the reaction

Method used

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  • Magnetic nanogold catalyst for synthesis of ester through one-step oxidative esterification of aldehydes as well as preparation method and application of catalyst
  • Magnetic nanogold catalyst for synthesis of ester through one-step oxidative esterification of aldehydes as well as preparation method and application of catalyst
  • Magnetic nanogold catalyst for synthesis of ester through one-step oxidative esterification of aldehydes as well as preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation method of the magnetic nano-gold catalyst for the one-step oxidative esterification of aldehydes into esters comprises the following steps:

[0032] (1) Rod Ce 0.66 Fe 0.34 o 2 Preparation of solid solution

[0033] Dissolve 1.74g of cerium nitrate and 0.92g of ferric nitrate in 20ml of water, add 54g of sodium hydroxide and 140g of water to prepare the sodium hydroxide solution, put the mixed solution into a 200ml Teflon-lined hydrothermal kettle, 100°C Under hydrothermal reaction for 24 h, then centrifuged and washed, the obtained solid was dried at 80 °C for 12 h, and then calcined at 400 °C for 4 h to obtain rod-shaped Ce 0.66 Fe 0.34 o 2 solid solution;

[0034] (2) Preparation of magnetic nano-gold catalyst

[0035] Prepared by sol precipitation method, with PVA as protective agent and NaBH 4 as a reducing agent. With stirring, add to 1 x 10 - 4 mol / L HAuCl 4 Add 1wt.% PVA aqueous solution to the aqueous solution, so that PVA / Au (wt / wt)...

Embodiment 2

[0039] Change the hydrothermal reaction temperature in Example 1 to 140°C to prepare granular Ce 0.66 Fe 0.34 o 2 Solid solution, all the other steps are with embodiment 1.

Embodiment 3

[0041] Change the hydrothermal reaction temperature in Example 1 to 180°C to prepare cubic Ce 0.66 Fe 0.34 o 2 solid solution, the rest of the steps are the same

[0042] Example 1.

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PUM

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Abstract

The invention relates to the technical field of chemical catalysis, in particular to a magnetic nanogold catalyst for synthesis of ester through one-step oxidative esterification of aldehydes as wellas a preparation method and an application of the catalyst. The magnetic nanogold catalyst takes Au as an active component and a CeaFebXcO2 solid solution as a carrier, wherein the supporting amount of Au accounts for 0.1wt.%-2wt.% of the total mass of Au and the CeaFebXcO2 solid solution; in the CeaFebXcO2 solid solution, a is larger than 0 and smaller than 1, b is larger than 0 and smaller than1, c is larger than or equal to 0 and smaller than 1, the sum of a, b and c is equal to 1, and X is Co, Ni, Zr, Mn, Y, La, Cu or Zn. The aldehyde conversion rate is 97.5%-99.9%, the ester selectivityis 97.3%-99.0%, the catalyst has the characteristics of being simple to operate, higher in conversion rate and better in product selectivity, the catalyst is convenient to recover, and the reaction stability and the process economy are greatly improved.

Description

technical field [0001] The invention relates to the technical field of chemical catalysis, in particular to a magnetic nano-gold catalyst for one-step oxidative esterification of aldehydes into esters, a preparation method and application thereof. Background technique [0002] Esters are important chemical and organic synthesis intermediates. The traditional synthetic method is to first prepare acid or acid derivatives by oxidation of aldehydes or alcohols, and then esterify the acids or acid derivatives. However, the preparation process complex, and the process produces many toxic by-products. [0003] Since 1970, there have been many patents related to catalysts for one-step oxidative esterification of aldehydes to generate esters, such as the gold-based catalysts involved in JP20000154164, JP2003192632, and JP2003361086; JP-B-4-72578, JP-A-61-243044, and US4638085 Involved palladium catalysts. Japanese patent JP2005008557 mentions the use of Au catalysts to catalyze the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/10B01J37/08B01J37/16C07C67/00C07C67/44C07C69/24C07C69/54
CPCB01J23/002B01J23/894B01J35/0033B01J37/088B01J37/10B01J37/16B01J2523/00C07C67/00C07C67/44B01J2523/3712B01J2523/48B01J2523/842B01J2523/845B01J2523/847B01J2523/72B01J2523/3706C07C69/54C07C69/24Y02P20/584
Inventor 李玉超田运郑艳霞傅忠君张苏黄昊飞张天
Owner 山东达民化工股份有限公司
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