Sustainable removal of N2O by mediated electrocatalytic reduction at ambient temperature electro-scrubbing using electrogenerated Ni(I) electron mediator

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dc.contributor.authorMuthuraman, G.
dc.contributor.authorRamu, A. G.
dc.contributor.authorMcAdam, Ewan J.
dc.contributor.authorMoon, I. S.
dc.date.accessioned2019-07-01T10:58:40Z
dc.date.available2019-07-01T10:58:40Z
dc.date.issued2019-06-12
dc.description.abstractDirect catalysis is generally proposed for nitrous oxide (N2O) abatement but catalysis is expensive, requires high temperatures, and suffers from media fouling, which limits its lifetime. In the present study, an ambient temperature electroscrubbing method was developed, coupling wet-scrubbing with an electrogenerated Ni(I) ([Ni(I)(CN)4]3−) mediator, to enable N2O reduction in a single process stage. The initial studies of 10 ppm N2O absorption into 9 M KOH and an electrolyzed 9 M KOH solution showed no removal. However, 95% N2O removal was identified through the addition of Ni(I) to an electrolyzed 9 M KOH. A change in the oxidation/reduction potential from −850 mV to −650 mV occurred following a decrease in Ni(I) concentration from 4.6 mM to 4.0 mM, which confirmed that N2O removal was mediated by an electrocatalytic reduction (MER) pathway. Online analysis identified the reaction product to be ammonia (NH3). Increasing the feed N2O concentration increased NH3 formation, which suggests that a decrease in electrolyzed solution reactivity induced by the increased N2O load constrained the side reaction with the carrier gas. Importantly, this study outlines a new regenerable method for N2O removal to commodity product NH3 at ambient temperature that fosters process intensification, overcomes the limitations generally observed with catalysis, and permits product transformation to NH3.en_UK
dc.identifier.citationMuthuraman G, Ramu AG, McAdam E, Moon IS. (2019) Sustainable removal of N2O by mediated electrocatalytic reduction at ambient temperature electro-scrubbing using electrogenerated Ni(I) electron mediator. Journal of Hazardous Materials, Volume 378, October 2019, Article number 120765en_UK
dc.identifier.issn0304-3894
dc.identifier.urihttps://doi.org/10.1016/j.jhazmat.2019.120765
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14278
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectN2O removalen_UK
dc.subjectNH3 formationen_UK
dc.subjectElectroscrubbing processen_UK
dc.subjectElectrocatalytic reductionen_UK
dc.titleSustainable removal of N2O by mediated electrocatalytic reduction at ambient temperature electro-scrubbing using electrogenerated Ni(I) electron mediatoren_UK
dc.typeArticleen_UK

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