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Fe2O3-CeO2/SiO2 solid base catalyst as well as preparation method and application thereof

A solid base catalyst, fe2o3-ceo2 technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve harsh reaction conditions, high production costs, equipment Large investment and other problems, to achieve the effect of simple preparation method, less by-products, and lower reaction temperature

Inactive Publication Date: 2019-04-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the equipment investment is very large, the reaction conditions are harsh, and the production cost is high.

Method used

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  • Fe2O3-CeO2/SiO2 solid base catalyst as well as preparation method and application thereof
  • Fe2O3-CeO2/SiO2 solid base catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1.44gFe(NO3 ) 3 9H 2 O, 1.0gCe(NO 3 ) 3 ·6H 2 O, dissolved in 60g of water and 32g of absolute ethanol to make a mixed solution. At 30 °C, the above mixed solution was impregnated in 3.4 g SiO 2 The catalyst precursor was obtained on the support and stirred for 1.5 hours. Add dropwise 50ml of KBH with a concentration of 0.5mol / L to the impregnated catalyst precursor 4 Aqueous solution, soak for 1 hour after dropwise addition. Filter, wash with 250ml of deionized water, wash with 250ml of methanol, put the solid into an oven after drying, and dry it under vacuum for 4 hours at 25°C to obtain Fe 2 o 3 -CeO 2 / SiO 2 catalyst.

Embodiment 2

[0035] 1.44gFe(NO 3 ) 3 9H 2 O was dissolved in 60g of water and 32g of absolute ethanol to make a mixed solution. At 30 °C, the above mixed solution was impregnated in 3.8 g SiO 2 The catalyst precursor was obtained on the support and stirred for 1.5 hours. Add dropwise 50ml of KBH with a concentration of 0.5mol / L to the impregnated catalyst precursor 4 Aqueous solution, soak for 1 hour after dropwise addition. Filter, wash with 250ml of deionized water, wash with 250ml of methanol, put the solid into an oven after drying, and dry it under vacuum for 4 hours at 25°C to obtain Fe 2 o 3 / SiO 2 catalyst.

Embodiment 3

[0037] 1.0gCe(NO 3 ) 3 ·6H 2 O was dissolved in 60g of water and 32g of absolute ethanol to make a mixed solution. At 30 °C, the above mixed solution was impregnated in 3.6 g SiO 2 The catalyst precursor was obtained on the support and stirred for 1.5 hours. Add dropwise 50ml of KBH with a concentration of 0.5mol / L to the impregnated catalyst precursor 4 Aqueous solution, soak for 1 hour after dropwise addition. Filter, wash with 250ml deionized water, wash with 250ml methanol, put the solid into an oven after drying, and dry it in vacuum at 25°C for 4 hours to obtain CeO 2 / SiO 2 catalyst.

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Abstract

The invention discloses a Fe2O3-CeO2 / SiO2 solid base catalyst as well as a preparation method and application thereof. The catalyst Fe2O3-CeO2 / SiO2 takes iron oxide as a first active component, ceriumoxide as a second active component and silica as a carrier; based on the mass of the carrier, the theoretical loading capacity of the first active component iron oxide is 7 to 14 percent by weight, and the theoretical loading capacity of the second active component cerium oxide is 10 to 20 percent by weight. The preparation method of the catalyst disclosed by the invention is simple and low in energy consumption, the carrier raw material is low in cost and easy to obtain, and the catalyst has good selectivity for pear alcohol ester exchange reaction and is less in byproducts; the ester exchange reaction reduces the reaction temperature and overcomes the shortcomings of relatively long original process route of a traditional process and low product yield, so that the preparation method isfavorable for scaling up for industrial production.

Description

(1) Technical field [0001] The invention belongs to the technical field of solid base catalysts, and in particular relates to a supported solid base iron cerium catalyst, a preparation method thereof and an application in preparing prenyl alcohol in the transesterification of pitol. (2) Background technology [0002] Prenyl alcohol is often used in the industry to synthesize methyl permethrin, an intermediate of low-toxicity and strong permethrin pesticides, and the downstream products of methyl permethrin, such as chrysanthemum acid chloride and permethrin. Pyrethroid pesticides are ideal substitutes for highly toxic and high-residue organophosphorus pesticides that are vigorously promoted in my country, and methyl pyrethroid is a necessary intermediate for the synthesis of pyrethroids, and is a link in the pyrethroid intermediates. The key raw material for the role of pyrethroids, currently in the domestic pyrethroid industry, there are still very few enterprises that have ...

Claims

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Application Information

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IPC IPC(8): B01J23/83C07C29/128C07C33/03
CPCB01J23/002B01J23/83B01J2523/00C07C29/1285B01J2523/3712B01J2523/41B01J2523/842C07C33/03
Inventor 严新焕吴辰亮
Owner ZHEJIANG UNIV OF TECH
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