SURFACE ALKALI PROMOTION OF CARBON DIOXIDE HYDROGENATION FOR CONSERVATION OF CARBON SOURCES: CYCLIC VOLTAMMETRY STUDY

Conversion of CO2 captured from biogas upgrading process into useful chemicals or fuels e.g. methane is an attractive route towards conservation of carbon sources. Sustainable hydrogenation route could be achieved by combining the process with hydrogen generated from water electrolysis. In this work...

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Bibliographic Details
Published inInternational journal of conservation science Vol. 11; no. 1; pp. 189 - 198
Main Authors Tan, Sze Yen, Ibrahim, Naimah, Ali, Umi Fazara M D, Yusuf, Sara Yasina, Aroua, Mohamed Kheireddine
Format Journal Article
LanguageEnglish
Published Iasi International Journal of Conservation Science (IJCS) 01.01.2020
Subjects
Biogas
Carbon cycle
Carbon dioxide
Carbon sources
Carbonates
Catalysts
Charge transfer
Conservation
Electrochemical analysis
Electrochemistry
Electrodes
Electrolysis
Electrolytes
Gas flow
Hydrogenation
Methanation
Morphology
Sodium
Sodium compounds
Voltammetry
Yttria-stabilized zirconia
United Kingdom > UK
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Summary:Conversion of CO2 captured from biogas upgrading process into useful chemicals or fuels e.g. methane is an attractive route towards conservation of carbon sources. Sustainable hydrogenation route could be achieved by combining the process with hydrogen generated from water electrolysis. In this work, cyclic voltammetry was used as preliminary technique to probe the electrochemical behaviour of Na-modified Pt/YSZ as model catalyst under CO2 hydrogenation. The reaction is irreversible and the voltammogram features are not easily distinguishable under reaction conditions. The increase in cathodic peak height and the decrease in peak potential with addition of sodium at low coverage (0.32%) indicated that the charge transfer reaction was enhanced and thus the methanation reaction could be electrochemically promoted given sufficient amount of H2 flow. However, increasing Na coverage was found to decrease the current hysteresis possibly due to formation of sodium compounds such as carbonates or oxides that populate the three-phase-boundary (tpb) active sites, thus deactivating the catalyst.
ISSN:2067-533X
2067-8223