Use of Nitrogenous Bases as Promoters of the Reaction of Ethylene Carboalkoxylation on a Cobalt Catalyst

Горбунов, Д. Н.; Nenasheva, M. V.; Кардашев, С. В.

doi:10.1134/s1070427219080032

Cited by 6 publications

(1 citation statement)

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“…Other research work also confirmed that acidic compound generated from the alcoholysis of carbonyl cobalt salt easily resulted in undesired ethers. Herein, N-donor ligand, especially the 3hydroxypyridine, acted as base additives stabilized the catalyst and partially neutralized the catalyst acidity, inhibiting the etherification by-products (Liu et al, 2006;Gorbunov et al, 2019;Zeng et al, 2021). Under such circumstance, transformation of EO was further optimized by Co 2 (CO) 8 in the presence of 3-hydroxypyridine.…”

Section: Carbonylative Transformation Of Ethylene Oxidementioning

confidence: 99%

Chemical kinetics and promoted Co-immobilization for efficient catalytic carbonylation of ethylene oxide into methyl 3-hydroxypropionate

et al. 2022

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The carbonylative transformation of ethylene oxide (EO) into methyl 3-hydroxypropionate (3-HPM) is a key process for the production of 1,3-propanediol (1,3-PDO), which is currently viewed as one of the most promising monomers and intermediates in polyester and pharmaceuticals industry. In this work, a homogeneous reaction system using commercial Co2(CO)8 was first studied for the carbonylation of EO to 3-HPM. The catalytic behavior was related to the electronic environment of N on aromatic rings of ligands, where N with rich electron density induced a stronger coordination with Co center and higher EO transformation. A reaction order of 2.1 with respect to EO and 0.3 with respect to CO was unraveled based on the kinetics study. The 3-HPM yield reached 91.2% at only 40°C by Co2(CO)8 coordinated with 3-hydroxypyridine. However, Co-containing colloid was formed during the reaction, causing the tough separation and impossible recycling of samples. Concerning the sustainable utilization, Co particles immobilized on pre-treated carbon nanotubes (Co/CNT-C) were designed via an in situ reduced colloid method. It is remarkable that unlike conventional Co/CNT, Co/CNT-C was highly selective toward the transformation of EO to 3-HPM with a specific rate of 52.2 mmol·gCo-1·h-1, displaying a similar atomic efficiency to that of coordinated Co2(CO)8. After reaction, the supported Co/CNT-C catalyst could be easily separated from the liquid reaction mixture, leading to a convenient cyclic utilization.

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Section: Carbonylative Transformation Of Ethylene Oxidementioning

confidence: 99%