Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Synthesizing method and application for bi-component bi-metallic catalyst

A bimetallic catalyst, synthesis method technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of low catalytic activity, catalyst activity and selectivity variation poor, low cost and other problems, to achieve the best activity and selectivity, catalytic efficiency and high selectivity

Active Publication Date: 2012-07-18
ZHEJIANG UNIV
View PDF2 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But generally speaking, there are following four disadvantages in above-mentioned catalyzer: 1) catalytic activity is low, and TON (the mole number of the epoxide that is per mole central active metal conversion) is generally less than 2000; More sensitive, showing that when water is contained in the reaction system, the activity and selectivity of the catalyst become significantly worse; such as by ZnX 2 (X=Cl, Br, OAc) and quaternary ammonium salt or phosphonium salt composition catalyst system to catalyze epoxide and CO 2 Coupling to form cyclic carbonates with very high catalytic efficiency and selectivity at relatively low cost
This is because the removal of water from polar epoxides is a rather energy-intensive and difficult process
[0004] Double metal cyanide complex is a heterogeneous catalyst, which can effectively catalyze the reaction of propylene oxide and CO 2 Copolymerized into polycarbonate materials, the catalytic efficiency can generally reach more than 1500g polymer / g catalyst, and its activity is much higher than other types of CO 2 Copolymerization catalyst, but in the process of copolymerization, often accompanied by a small amount of cyclocarbonate by-products

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 0.80g potassium hexacyanocobaltate K 3 Co(CN) 6 Dissolve in 50mL deionized water, add 2.1g EO 20 PO 70 EO 20 (Pluronic P123), stirred until completely dissolved; then added dropwise until 4.0g of ZnCl was dissolved 2 In 10ml of aqueous solution, stirred and reacted at 75°C for 2 hours, then obtained a solid after suction filtration and vacuum drying; mixed the obtained solid with 11.42g of tetra-n-butylammonium bromide, ball milled with tetrahydrofuran as a solvent for 24 hours, and distilled off the solvent and drying to obtain a two-component bimetallic catalyst.

[0036] The elemental analysis results were: Co: 1.19, Zn: 2.59.

Embodiment 2

[0038] Dissolve 2.0g potassium bromide pentacyanocobaltate in 8.0ml deionized water, add 2.1g EO 20 PO 70 EO 20 , stirred until completely dissolved; then added dropwise until 30.0g of ZnCl was dissolved 2 In 100ml of aqueous solution, stirred and reacted at 75°C for 2 hours, then obtained a solid after suction filtration and vacuum drying; mixed the obtained solid with 12.50g of tetra-n-butylammonium chloride, ball milled with tetrahydrofuran for 24 hours, and distilled off the solvent and drying to obtain a two-component bimetallic catalyst.

[0039] The elemental analysis results were: Co: 1.09, Zn: 2.39.

Embodiment 3

[0041] According to embodiment 1, adopt 15.0g zinc nitrate, change tetra-n-butylammonium bromide into 0.94g dedecyltrimethylammonium bromide simultaneously.

[0042] The elemental analysis results were: Co: 6.99, Zn: 15.30.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of green organic synthesis and aims to provide a synthesizing method and application for a bi-component bi-metallic catalyst. The method comprises the following steps that: dissolving multi-cyanogroup alloy potassium peroxymonopersulfate in deionized water, and then adding a water soluble polymer; stirring till completely dissolving the water soluble polymer, and then dripping into the aqueous solution of halide salt, nitrate, phosphate or sulfate of zinc, cobalt or cadmium; after stirring or performing ultrasonic reaction, separating and drying so as to obtain solid; mixing the obtained solid with quaternary ammonium salt, phosphor salt or mixture thereof in any proportion; and performing wet ball milling on the obtained mixture, and then separating, drying and sieving, thereby obtaining the bi-component bi-metallic catalyst. The bi-component bi-metallic catalyst is high in catalyzing efficiency and selectivity; the overall indicator of the catalyzing efficiency and selectivity is better than that of the prior art; the bi-component bi-metallic catalyst has the obvious advantage that less water almost has no influence on the activity and selectivity of the catalyst; and the catalyst provided by the invention is capable of catalyzing the coupling reaction of bi-radical or multi-radical oxide and CO2 and has excellent activity and selectivity.

Description

technical field [0001] The invention belongs to the field of green organic synthesis, and in particular relates to a two-component bimetallic catalyst and its application in the process of efficiently synthesizing cyclic carbonates by catalyzing epoxides and carbon dioxide. Background technique [0002] carbon dioxide (CO 2 ) is a major greenhouse gas, but also a very important carbon resource. Because it is inexhaustible, the price of pure products is low, and it is non-toxic and harmless, CO 2 Chemical fixation as useful chemical raw materials or organic materials has attracted intense attention and is also an effective way to utilize CO 2 the key way. Among them, by CO 2 Coupling reaction with epoxides to prepare five-membered cyclic carbonates is an important research direction. such as propylene oxide and CO 2 The coupling reaction product propylene carbonate is an aprotic organic solvent with low toxicity and high boiling point and can be used as a "green" solven...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J31/28C07D317/36C08G59/14
Inventor 张兴宏魏人建杜滨阳戚国荣
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products