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Pyrolysis of biogas for carbon capture and carbon dioxide-free production of hydrogen

Çelik, Ahmet 1; Ben Othman, Iadh 1; Müller, Heinz 1; Lott, Patrick ORCID iD icon 1; Deutschmann, Olaf ORCID iD icon 1
1 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)

Abstract:

Methane pyrolysis is considered an auspicious approach for large-scale hydrogen production and simultaneous carbon capture, hereby contributing to a decarbonization of the chemical industry. While commonly pure methane or natural gas serve as a feedstock, the usage of biogas may allow exploitation of the pyrolysis process as a carbon sink. In this context, the present study reports on biogas pyrolysis in a high-temperature reactor at temperatures between 1000 °C and 1600 °C, residence times between 1 s and 7 s, and molar CH$_4$ : CO$_2$ ratios in the biogas between 1 : 1 and 4 : 1. Among these conditions, high residence times, a high CH$_4$ content, and the introduction of a carbonaceous fixed bed in the reactor benefit high educt conversion, H$_2$ selectivity, and solid carbon yield. A carbon fixation of up to 95% was achieved during reference measurements with pure CH$_4$ feeds, whereas a carbon yield of 75% was found for biogas feeds. The analysis of the reaction product distribution uncovered a consumption of CO$_2$ via dry reforming, water gas shift, and Boudouard reactions, resulting in a maximum H$_2$ : CO ratio of 3 : 1 in the effluent gas stream. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000163487
Veröffentlicht am 26.10.2023
Originalveröffentlichung
DOI: 10.1039/D3RE00360D
Scopus
Zitationen: 11
Web of Science
Zitationen: 5
Dimensions
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 20.12.2023
Sprache Englisch
Identifikator ISSN: 2058-9883
KITopen-ID: 1000163487
Erschienen in Reaction Chemistry & Engineering
Verlag Royal Society of Chemistry (RSC)
Band 9
Heft 1
Seiten 108–118
Nachgewiesen in Scopus
Web of Science
Dimensions
Globale Ziele für nachhaltige Entwicklung Ziel 9 – Industrie, Innovation und InfrastrukturZiel 13 – Maßnahmen zum Klimaschutz
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