Amination of Ethylene Glycol to Ethylenediamine Catalyzed by Co‐Cu/γ‐Al₂O₃

Abstract

Ethylenediamine is an important organic chemical and commercially produced from non-renewable starting material. In the present work, amination of ethylene glycol to ethylenediamine was studied using an aqueous ammonia as ammonia source. A series of supported bimetallic catalysts were prepared by impregnation method and characterized by means of H 2 -TPR, H 2 -TPD, XRD, XPS and N 2 adsorption-desorption. Their catalytic performance for amination of ethylene glycol was investigated and CoÀ Cu/γ-Al 2 O 3 catalyst exhibited high activity and good selectivity to ethylenediamine. There exists obvious interaction and synergistic effect between Cu and Co in CoÀ Cu/γ-Al 2 O 3 for lowering catalyst reduction temperature and improving catalytic performance separately. The selectivity of ethylenediamine and ethanolamine respectively attained 45.7 % and 23.7 % at an ethylene glycol conversion of 41.5 % under the suitable reaction conditions. On this basis, a majority of by-products in the amination of ethylene glycol were identified by gas chromatography-mass spectrometry analysis and a reaction network was proposed.

Iron oxide/graphene oxide nanocomposite synthesis using atmospheric cold plasma

“…The estimation of the post--discharge gas temperature was done by measuring the rotational temperature of OH (l = 306 to l = 310 nm) from the OES data. 45 This temperature is competitively lower than the current lowest temperature of graphene synthesis (>250 °C) 46 achieved using atmospheric pressure microwave plasma. 47,48 Therefore, we estimate the great perspective of this process as it opens a new horizon in low-temperature single-step preparation of metal-oxide@graphene-based nanocomposites.…”

Green Catalytic Synthesis of Ethylenediamine from Ethylene Glycol and Monoethanolamine: A Review

“…Hence, various catalytic systems have been developed to realize the amination of EG under mild conditions. In 2022, a supported bimetallic catalyst Co–Cu/γ-Al 2 O 3 was investigated by An et al, delivering an EG conversion of 54.4% and an EDA yield of 24.7% at 200 °C and 4 MPa H 2 . The interaction between Cu and Co reduces the reduction temperature of the catalyst, while Cu and Co facilitate the dehydrogenation of EG and the following amination reaction, respectively.…”

“…In 2022, a supported bimetallic catalyst Co–Cu/γ-Al 2 O 3 was investigated by An et al, delivering an EG conversion of 54.4% and an EDA yield of 24.7% at 200 °C and 4 MPa H 2 . 25 The interaction between Cu and Co reduces the reduction temperature of the catalyst, while Cu and Co facilitate the dehydrogenation of EG and the following amination reaction, respectively. Hence, the synergy of different metals plays a key role in the catalytic activity and selectivity of EG amination.…”