Electrosynthesis of α‐Amino Acids from NO and other NO_x species over CoFe alloy‐decorated Self‐standing Carbon Fiber Membranes

Abstract

The conversion of industrial exhaust gases of nitrogen oxides into high-value products is significantly meaningful for global environment and human health. And green synthesis of amino acids is vital for biomedical research and sustainable development of mankind. Herein, we demonstrate an innovative approach for converting nitric oxide (NO) to a series of αamino acids (over 13 kinds) through electrosynthesis with α-keto acids over self-standing carbon fiber membrane with CoFe alloy. The essential leucine exhibits a high yield of 115.4 μmol h À 1 corresponding a Faradaic efficiency of 32.4 %, and gram yield of products can be obtained within 24 hours in lab as well as an ultra-long stability (> 240 h) of the membrane catalyst, which could convert NO into NH 2 OH rapidly attacking α-keto acid and subsequent hydrogenation to form amino acid. In addition, this method is also suitable for other nitrogen sources including gaseous NO 2 or liquidus NO 3 À and NO 2 À . Therefore, this work not only presents promising prospects for converting nitrogen oxides from exhaust gas and nitrate-laden waste water into high-value products, but also has significant implications for synthetizing amino acids in biomedical and catalytic science.

Efficient electrochemical coupling of nitrate and biomass-derived acetone to acetoxime at a high current density over a Zn/Cu hexagonal nanosheet catalyst

“…43 Since Jiao successfully constructed acetamide from CO and NH 3 using an electrocatalytic method over Cu-based catalysts, 44 the green synthesis of organonitrogen compounds using readily available carbon/nitrogen-containing small molecules under mild conditions has become an emerging field. 8,45–48 In the field of electrosynthesis of oximes, researchers have successfully synthesized cyclohexanone oxime, 49,50 benzaldoxime, 51 formaldoxime, 52 cyclopentanoxime, 53 and pralidoxime 42 from C-containing (cyclohexanone, benzaldehyde, formaldehyde, acetone, pyridine aldehyde) and N-containing (NO 3 − , NO 2 − , NO) small molecules as reactants. Although there has been some progress in the electrocatalytic C–N/CN field, this reaction typically entails multi-step elementary reactions, rendering it a complex catalytic system.…”