Clean Conversion of Aqueous Ammonia Using a Solid Oxide Cell

M. Ragu, C. J. Laycock, G. Owen, G. Lloyd, A. Guwy

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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Abstract

Waste aqueous ammonia is produced in significant quantities as part of coke production processes required for steelmaking. In this work, the utilization of a simulated aqueous ammonia waste (ammonium hydroxide) was investigated using a commercially available anode-supported solid oxide cell. The electrical performance of the cell was characterized using I-V curves and the output gases from the anode were measured in real-time using quadrupole mass spectrometry. Upon delivery to the anode, there was total decomposition of ammonia to form hydrogen and nitrogen with no NO xformation observed. The cell operated more efficiently in fuel cell mode due to alleviation of OCV, activation, and concentration losses. In electrolysis mode, the cell produced H2through a mixture of catalytic ammonia decomposition (48 vol%) and electrochemical H2O reduction (52 vol%) to yield output gas mixtures composed of 90-93 vol% H2(voltage dependent) balanced only in N2.

Original languageEnglish
Title of host publicationECS Transactions
Place of PublicationUnited Kingdom
PublisherIOP Publishing Ltd.
Pages2173-2184
Number of pages12
Volume103
ISBN (Electronic)978-1607685395
DOIs
Publication statusPublished - 18 Jul 2021
Event17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021 - Stockholm, Sweden
Duration: 18 Jul 202123 Jul 2021

Publication series

NameECS Transactions
Number1
Volume103
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021
Country/TerritorySweden
CityStockholm
Period18/07/2123/07/21

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