Electrochemical Conversion of NO to NH3 in a PEM Cell

Sorin Bunea; Manoj Coppens; Atsushi Urakawa

doi:10.1021/acscatal.3c01600

Electrochemical Conversion of NO to NH₃ in a PEM Cell

Sorin Bunea, Manoj Coppens, Atsushi Urakawa^*

^*Corresponding author for this work

ChemE/Catalysis Engineering

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Abstract

The continuous electrochemical NO reduction to ammonia in a PEM cell was investigated in this work. We used a ruthenium-based catalyst at the cathode and an iridium oxide catalyst at the anode. The highest ammonia faradaic efficiency was observed at 1.9 V cell voltage. Adjusting the NO flow allowed to achieve 97% NO conversion and 93% ammonia faradaic efficiency for a 5.2% NO/He feed. The ammonia yield was 0.51 mmol cm^-2 h^-1, among the highest reported to date with the advantage of continuous operation. Experiments with a low NO concentration feed of 983 ppm showed 98% conversion at 0 V vs pseudo-RHE. Achieving this performance under such mild conditions indicates the great potential of the PEM cells for NO_x abatement applications and the production of valuable NH₃

Original language	English
Pages (from-to)	11345-11351
Journal	ACS Catalysis
Volume	13
Issue number	17
DOIs	https://doi.org/10.1021/acscatal.3c01600
Publication status	Published - 2023

Keywords

electrocatalysis
electrochemical ammonia synthesis
NO reduction
polymer electrolyte membrane
ruthenium catalyst

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10.1021/acscatal.3c01600

acscatal.3c01600Final published version, 2.43 MBLicence: CC BY

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title = "Electrochemical Conversion of NO to NH3 in a PEM Cell",

abstract = "The continuous electrochemical NO reduction to ammonia in a PEM cell was investigated in this work. We used a ruthenium-based catalyst at the cathode and an iridium oxide catalyst at the anode. The highest ammonia faradaic efficiency was observed at 1.9 V cell voltage. Adjusting the NO flow allowed to achieve 97% NO conversion and 93% ammonia faradaic efficiency for a 5.2% NO/He feed. The ammonia yield was 0.51 mmol cm-2 h-1, among the highest reported to date with the advantage of continuous operation. Experiments with a low NO concentration feed of 983 ppm showed 98% conversion at 0 V vs pseudo-RHE. Achieving this performance under such mild conditions indicates the great potential of the PEM cells for NOx abatement applications and the production of valuable NH3",

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T1 - Electrochemical Conversion of NO to NH3 in a PEM Cell

AU - Bunea, Sorin

AU - Coppens, Manoj

AU - Urakawa, Atsushi

PY - 2023

Y1 - 2023

N2 - The continuous electrochemical NO reduction to ammonia in a PEM cell was investigated in this work. We used a ruthenium-based catalyst at the cathode and an iridium oxide catalyst at the anode. The highest ammonia faradaic efficiency was observed at 1.9 V cell voltage. Adjusting the NO flow allowed to achieve 97% NO conversion and 93% ammonia faradaic efficiency for a 5.2% NO/He feed. The ammonia yield was 0.51 mmol cm-2 h-1, among the highest reported to date with the advantage of continuous operation. Experiments with a low NO concentration feed of 983 ppm showed 98% conversion at 0 V vs pseudo-RHE. Achieving this performance under such mild conditions indicates the great potential of the PEM cells for NOx abatement applications and the production of valuable NH3

AB - The continuous electrochemical NO reduction to ammonia in a PEM cell was investigated in this work. We used a ruthenium-based catalyst at the cathode and an iridium oxide catalyst at the anode. The highest ammonia faradaic efficiency was observed at 1.9 V cell voltage. Adjusting the NO flow allowed to achieve 97% NO conversion and 93% ammonia faradaic efficiency for a 5.2% NO/He feed. The ammonia yield was 0.51 mmol cm-2 h-1, among the highest reported to date with the advantage of continuous operation. Experiments with a low NO concentration feed of 983 ppm showed 98% conversion at 0 V vs pseudo-RHE. Achieving this performance under such mild conditions indicates the great potential of the PEM cells for NOx abatement applications and the production of valuable NH3

KW - electrocatalysis

KW - electrochemical ammonia synthesis

KW - NO reduction

KW - polymer electrolyte membrane

KW - ruthenium catalyst

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Electrochemical Conversion of NO to NH₃ in a PEM Cell

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