A two-step regeneration method for carbon-supported Ru catalysts deactivated by coke and sulfur during hydrothermal gasification
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Autor:in (Körperschaft)
Publikationsdatum
2026
Typ der Arbeit
Studiengang
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
The Journal of Supercritical Fluids
Themenheft
DOI der Originalpublikation
Link
Zugehörige Forschungsdaten
Reihe / Serie
Reihennummer
Jahrgang / Band
234
Ausgabe / Nummer
Seiten / Dauer
106970
Patentnummer
Verlag / Herausgebende Institution
Elsevier
Verlagsort / Veranstaltungsort
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
Catalytic hydrothermal gasification (cHTG) offers a sustainable pathway for converting wet biomass into methane, but long-term operation is hindered by catalyst deactivation, particularly due to coke deposition and sulfur poisoning. Ruthenium on activated carbon (Ru/AC) is highly active for methane production but gradually loses performance during continuous gasification of biomass or wastes. Conventional high-temperature oxidative regeneration methods, which rely on combustion to remove coke, are unsuitable for carbon supports due to their poor stability in the presence of oxidizing agents. Here, a low-temperature aqueous regeneration strategy was explored using hydrogen peroxide (H 2 O 2 ) oxidation followed by subcritical water flushing. Effluent analysis and catalyst characterization reveal that coke is primarily oxidized and removed during H 2 O 2 oxidation (<120 °C), while sulfur species are oxidized to strongly adsorbed forms (sulfate) that require subsequent desorption via subcritical water flushing. Based on these insights, a two-step regeneration protocol was developed, consisting of two H 2 O 2 oxidation treatments (85–120 °C), each followed by subcritical water flushing (up to 320 °C). This approach achieves (97 ± 2) % sulfur removal while preserving carbon support integrity. The method enables efficient catalyst regeneration targeting both coking and sulfur fouling, offering a practical aqueous strategy to extend the operational lifetime of Ru/AC catalysts in cHTG and related catalytic systems without the need to remove the material from the catalytic reactor for regeneration. • Two-step aqueous regeneration restores Ruthenium catalyst activity. • Low-temperature H 2 O 2 oxidation removes coke and converts sulfur to oxidized forms. • Subcritical water flushing desorbs strongly bound sulfur species. • 97 ± 2% sulfur removal achieved without damaging carbon support. • Enables catalyst regeneration and lifetime extension without reactor disassembly.
Schlagwörter
Fachgebiet (DDC)
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
0896-8446
1872-8162
1872-8162
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
peer-reviewed
Open Access-Status
Hybrid
Lizenz
Zitation
Sun, S., Bjelić, S., Hua, W., Vogel, F., & Baudouin, D. (2026). A two-step regeneration method for carbon-supported Ru catalysts deactivated by coke and sulfur during hydrothermal gasification. The Journal of Supercritical Fluids, 234, 106970. https://doi.org/10.1016/j.supflu.2026.106970