CO2/Propylene Oxide Copolymerization with a Bifunctional Catalytic System Composed of Multiple Ammonium Salts and a Salen Cobalt Complex Containing Sulfonate Anions

2021 ◽  
Vol 29 (12) ◽  
pp. 855-863
Author(s):  
Yeong Hyun Seo ◽  
Yong Bin Hyun ◽  
Hyun Ju Lee ◽  
Hong Cheol Lee ◽  
Jung Hyun Lee ◽  
...  
Keyword(s):  
Catalytic System ◽  
Propylene Oxide ◽  
Cobalt Complex ◽  
Ammonium Salts

A Highly Active and Recyclable Catalytic System for CO2/Propylene Oxide Copolymerization

2008 ◽  
Vol 120 (38) ◽  
pp. 7416-7419 ◽  
Author(s):  
Sujith S ◽  
Jae Ki Min ◽  
Jong Eon Seong ◽  
Sung Jea Na ◽  
Bun Yeoul Lee
Keyword(s):  
Catalytic System ◽  
Propylene Oxide ◽  
Highly Active

Polymerization of propylene oxide in the presence of a diethylzinc–pyrogallol catalytic system

1979 ◽  
Vol 17 (4) ◽  
pp. 1235-1238 ◽  
Author(s):  
Witold Kuran ◽  
Andrzej Rokicki ◽  
Jan Pieńkowski
Keyword(s):  
Catalytic System ◽  
Propylene Oxide

Silica supported Schiff-base cobaltIII complex-Lewis base system: a highly selective catalyst for alternating copolymerization of CO2 and propylene oxide

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Yongsheng Niu ◽  
Hongchun Li
Keyword(s):  
Molecular Weight ◽  
Schiff Base ◽  
Reaction Time ◽  
Propylene Oxide ◽  
Cobalt Complex ◽  
Catalyst System ◽  
Cyclic Carbonate ◽  
Lewis Base ◽  
Molar Ratio ◽  
Base System

AbstractAn binary catalyst system of a silica supported Schiff-base cobalt complex SalenCoIII (OAC)-MCM-41 (Salen = 3-[N,N-bis-2-(3,5-di-tert-butylsalicylidenamino) ethyl] amine) was developed to generate the copolymerization of CO2 and propylene oxide in presence of (4-dimethylamino)-pyridine (DMAP). The influence of the molar ratio of catalyst components, the operating temperature, reaction time, and CO2 pressure on the yield as well as the molecular weight of polycarbonate was systematically investigated. The high selectivity of polycarbonate over cyclic carbonate at 40 °C was maintained after a longer reaction time to attain quantitative formation of the alternating copolymer. High molecular weight of 67 000 were achieved at an appropriate combination of all variables.

A Highly Active and Recyclable Catalytic System for CO2/Propylene Oxide Copolymerization

2008 ◽  
Vol 47 (38) ◽  
pp. 7306-7309 ◽  
Author(s):  
Sujith S ◽  
Jae Ki Min ◽  
Jong Eon Seong ◽  
Sung Jea Na ◽  
Bun Yeoul Lee
Keyword(s):  
Catalytic System ◽  
Propylene Oxide ◽  
Highly Active

A novel and recyclable catalytic system for propylene carbonate synthesis from propylene oxide and CO2

Polyhedron ◽  
2012 ◽  
Vol 32 (1) ◽  
pp. 86-89 ◽  
Author(s):  
Zhiqiang Wang ◽  
Zhanwei Bu ◽  
Tingting Cao ◽  
Tiegang Ren ◽  
Lirong Yang ◽  
...  
Keyword(s):  
Propylene Carbonate ◽  
Catalytic System ◽  
Propylene Oxide

scholarly journals A New Dinuclear Cobalt Complex for Copolymerization of CO2 and Propylene Oxide: High Activity and Selectivity

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4095
Author(s):  
Wen-Zhen Wang ◽  
Kai-Yue Zhang ◽  
Xin-Gang Jia ◽  
Li Wang ◽  
Lei-Lei Li ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Propylene Carbonate ◽  
Propylene Oxide ◽  
Catalytic Reaction ◽  
Density Functional ◽  
Cobalt Complex ◽  
Catalyst System ◽  
High Catalytic Activity ◽  
Weight Yield ◽  
Carbon Dioxide Co2

Based on the ligand H4Salen-8tBu (salen-4), a new dinuclear cobalt complex (salen-4)[Co(III)TFA]2 (salen-4 = 3,5-di-tert-butylsalicylaldehyde-3,3′-diaminobiphenylamine; TFA = trifluoroacetic acid) has been firstly synthesized and characterized. It shows high catalytic activity for the copolymerization of propylene oxide (PO) and carbon dioxide (CO2), yielding regioregular poly(propylene carbonate) (PPC) with little generation of propylene carbonate (PC) by-product. It has been found that (salen-4)[Co(III)TFA]2 shows higher activity at milder conditions, generating a polymer with maximum Mn of 293 kg/mol and a narrow molecular weight distribution PDI of 1.35. The influences of reaction time, CO2 pressure, reaction temperature, nature of the cocatalyst, catalyst dosage and substrate concentration on the molecular weight, yield and selectivity of the polymer were explored in detail. The results showed that the (salen-4)[Co(III)TFA]2/[PPN]TFA catalyst system demonstrated a remarkable TOF as high as 735 h–1. In addition, a hypothetical catalytic reaction mechanism was proposed based on density functional theory (DFT) calculations and the catalytic reaction results of the (salen-4)[Co(III)TFA]2.

Epoxidation of Propylene with O2 Catalyzed by EuCl3

2012 ◽  
Vol 550-553 ◽  
pp. 375-378
Author(s):  
Wen Ming Liu ◽  
Fen Liu ◽  
Zhao Ping Chen ◽  
Feng Yi Li
Keyword(s):  
Rare Earth ◽  
Carboxylic Acids ◽  
Catalytic System ◽  
Propylene Oxide ◽  
Zinc Powder ◽  
Propanoic Acid ◽  
Direct Oxidation ◽  
Epoxidation Of Propylene ◽  
Basic Substance ◽  
Rare Earth Chloride

The formation of propylene oxide from propylene by direct oxidation with O2 has been studied with catalysts of rare earth chloride under different carboxylic acids and solvents, and the mechanism of this reaction has been discussed preliminarily. Significant PO-formation was only observed when catalyzed by EuCl3 and in the presence of zinc powder and carboxylic acids. In using carboxylic acids, propanoic acid is the best for the epoxidation of propylene. The yields of the epoxide became higher than those without solvents, but basic substance was not suitable as solvent. In the catalytic system of EuCl3, zinc powder and carboxylic acids, EuCl3 plays a role in transferring electron, zinc powder was the e- donor and carboxylic acids was the H+ donor. The mechanism was consistent with the result of the experiment.

scholarly journals Salen cobalt complex catalyzes the copolymerization of carbon dioxide and propylene oxide with high activity

2021 ◽  
Vol 844 (1) ◽  
pp. 012004
Author(s):  
Wen-Zhen Wang ◽  
Yi-Le Zhang ◽  
Jun Shi ◽  
Li Wang ◽  
Xin-Gang Jia ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
High Activity ◽  
Propylene Oxide ◽  
Cobalt Complex
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