Co-Electrolysis of Simulated Coke Oven Gas with Carbon Dioxide Using a Solid Oxide Electrolysis Cell

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Abstract

Coke oven gas (COG) is a byproduct of coke production typically composed of 57 vol% hydrogen, 27 vol% methane, 7 vol% carbon monoxide and impurities. It is partially re-utilised within steelmaking, with surplus flared and released to the atmosphere, significantly contributing to industrial carbon emissions and wasting a valuable resource. This study has investigated coelectrolysis of simulated COG (CH4/H2 mixtures) with a CO2 cooxidant using a commercially available anode-supported solid oxide electrolysis cell at 750 °C. The electrical performance of the cell was characterised using electrochemical techniques and the product gas composition was analysed using quadrupole mass spectrometry. With a 1:1 fuel-to-oxidant ratio, catalytic processes accounted for 68 % of synthesis gas production, and a further 14 % gain was achieved when operating in electrolysis mode at 1.4 V. H2/CO ratios of 1.1-2.4 were obtained depending on the fuel-tooxidant ratio of the feed. Decreasing the fuel-to-oxidant ratio improved the electrical performance and durability of the cell but decreased the overall synthesis gas yield.
Original languageEnglish
Title of host publication17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021
Place of PublicationUnited Kingdom
PublisherIOP Publishing Ltd.
Pages629-641
Number of pages13
Volume103
Edition1
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 18 Jul 2021
Event17th International Symposium on Solid Fuel Cells - Digital
Duration: 18 Jul 202123 Jul 2021
Conference number: XCVII

Publication series

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

Conference

Conference17th International Symposium on Solid Fuel Cells
Abbreviated titleSOFC-XVII
Period18/07/2123/07/21

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