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Understanding the fate of nitrogen during catalytic hydrothermal liquefaction of sewage sludge

Fan, Yujie 1; Meyer, Leif; Gong, Miao; Krause, Bärbel ORCID iD icon 2; Hornung, Ursel ORCID iD icon 1; Dahmen, Nicolaus 1
1 Institut für Katalyseforschung und -technologie (IKFT), Karlsruher Institut für Technologie (KIT)
2 Institut für Photonenforschung und Synchrotronstrahlung (IPS), Karlsruher Institut für Technologie (KIT)

Abstract:

In this study, the fate of nitrogen during catalytic hydrothermal liquefaction (HTL) of sewage sludge (SS) is investigated using three different catalysts (CuNi/SiO2, HCOOH, CuSO4) with 5 wt% loading. The bio-crude yields obtained from HTL experiments catalyzed with CuNi/SiO2 are similar to those obtained through non-catalyzed experiments. HCOOH slightly increases the bio-crude yields, while maximum yields of 24.5 wt% is obtained in the presence of CuSO4, which also reduces the nitrogen content by 15 % and enhances the hydrocarbons compared to the non-catalyzed HTL. Mechanistic investigations regarding the interaction of amino acids and carbohydrates by Maillard reactions are carried out using model compounds, namely lysine and lactose. CuSO4 effectively increases the yield with 50 % and reduces the nitrogen content by 24 % in the bio-crude during HTL of lysine alone. In the case of the model mixtures, bio-crude yields, nitrogen content, and Maillard reactions products behaved similarly both for catalytic and non-catalytic HTL, a slight reduction of amines was found in the presence of CuSO4. Hydro-char and some organic compounds are assumed to act highly reductant during catalytic HTL. ... mehr

Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 0016-2361
KITopen-ID: 1000153444
HGF-Programm 38.05.01 (POF IV, LK 01) Anthropogenic Carbon Cycle
Weitere HGF-Programme 56.12.11 (POF IV, LK 01) Materials - Quantum, Complex and Functional
Erschienen in Fuel
Verlag Elsevier
Band 339
Seiten Art.-Nr.: 126948
Vorab online veröffentlicht am 02.12.2022
Schlagwörter Hydrothermal liquefaction, Sewage sludge, Nitrogen, Catalyst, Maillard reactions
Nachgewiesen in Dimensions
Web of Science
Scopus
OpenAlex
Globale Ziele für nachhaltige Entwicklung Ziel 6 – Sauberes Wasser und Sanitär-EinrichtungenZiel 7 – Bezahlbare und saubere Energie

Verlagsausgabe §
DOI: 10.5445/IR/1000153444
Veröffentlicht am 02.12.2022
Originalveröffentlichung
DOI: 10.1016/j.fuel.2022.126948
Scopus
Zitationen: 12
Web of Science
Zitationen: 11
Dimensions
Zitationen: 13
Seitenaufrufe: 176
seit 02.12.2022
Downloads: 143
seit 05.12.2022
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