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  Influence of Synthesis Gas Components on Hydrogen Storage Properties of Sodium Aluminum Hexahydride

Sun, T., Peinecke, K., Urbanczyk, R., & Felderhoff, M. (2021). Influence of Synthesis Gas Components on Hydrogen Storage Properties of Sodium Aluminum Hexahydride. Hydrogen, 2(1), 147-159. doi:10.3390/hydrogen2010009.

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 Creators:
Sun, Tai1, Author
Peinecke, Kateryna2, Author              
Urbanczyk, Robert3, Author              
Felderhoff, Michael2, Author              
Affiliations:
1Guangdong Key Laboratory of Rare Earth Development and Application, Guangdong Research Institute of Rare Metals, Guangzhou 510650, China, ou_persistent22              
2Research Group Felderhoff, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_3027887              
3Institut für Energie- und Umwelttechnik e. V. (IUTA), Bliersheimer Str. 58 – 60, 47229 Duisburg, Germany, ou_persistent22              

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Free keywords: hydrogen storage; Na3AlH6; complex hydride; hydrogen impurity
 Abstract: A systematic study of different ratios of CO, CO2, N2 gas components on the hydrogen storage properties of the Na3AlH6 complex hydride with 4 mol% TiCl3, 8 mol % aluminum and 8 mol % activated carbon is presented in this paper. The different concentrations of CO and CO2 in H2 and CO, CO2, N2 in H2 mixture were investigated. Both CO and CO2 gas react with the complex hydride forming Al oxy-compounds, NaOH and Na2CO3 that consequently cause serious decline in hydrogen storage capacity. These reactions lead to irreversible damage of complex hydride under the current experimental condition. Thus, after 10 cycles with 0.1 vol % CO + 99.9 vol % H2 and 1 vol % CO + 99 vol % H2, the dehydrogenation storage capacity of the composite material decreased by 17.2 % and 57.3 %, respectively. In the case of investigation of 10 cycles with 1 vol % CO2 + 99 vol % H2 gas mixture, the capacity degradation was 53.5 %. After 2 cycles with 10 vol % CO +90 vol % H2, full degradation was observed, whereas after 6 cycles with 10 vol % CO2 + 90 vol % H2, degradation of 86.8% was measured. While testing with the gas mixture of 1.5 vol % CO + 10 vol % CO2 + 27 vol % H2 + 61.5 vol % N2, the degradation of 94% after 6 cycles was shown. According to these results, it must be concluded that complex aluminum hydrides cannot be used for the absorption of hydrogen from syngas mixtures without thorough purification

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Language(s): eng - English
 Dates: 2020-12-232021-02-222021-02-26
 Publication Status: Published online
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3390/hydrogen2010009
 Degree: -

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Title: Hydrogen
Source Genre: Journal
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Publ. Info: Basel : MDPI
Pages: - Volume / Issue: 2 (1) Sequence Number: - Start / End Page: 147 - 159 Identifier: ISSN: 2673-4141
CoNE: https://pure.mpg.de/cone/journals/resource/2673-4141