08.23.2021

Catalytic conversion of CO2: Electrochemically to ethanol and thermochemically to cyclic carbonates using nanoporous polytriazine

By Ruchi Sharma et al.

Catalytic conversion of CO2 by both electrochemical pathway and thermochemical heterogeneous catalysis is reported using nanoporous polytriazine (NENP). The NENP has large N content (∼50 wt%) and high SABET (707 m2 g−1). This heterogeneous catalyst unlike several others catalyst systems doesn’t require any co-catalyst for epoxide and CO2 activation simultaneously, forming cyclic carbonates. Even a mild experimental condition of 12 h solvothermal heating at 4 bar of CO2 pressure could lead to almost 100 % conversion of the epoxides. Moreover, NENP exhibited satisfactory stability and versatility, and gives a retention of 89.8 % activity after five cycles. Similarly, the same catalyst has been used for the CO2 electroreduction to ethanol and methane. The catalyst shows high Faradaic efficiency (FE) of 68 % and high selectivity in the ethanol synthesis at a potential of –0.5 V vs reversible hydrogen electrode (RHE). CO2 utilization as C2 source is unprecedented as in most of the reported literatures, it acts as a C1 source forming methane, methanol or carbon monoxide as the predominant products.

The full (paywalled) article appeared on the Journal of CO2 Utilization website at https://www.sciencedirect.com/science/article/abs/pii/S2212982021002432

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