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DOI: 10.5445/IR/1000080581
DOI: 10.3390/en11030496

Towards Biochar and Hydrochar Engineering—Influence of Process Conditions on Surface Physical and Chemical Properties, Thermal Stability, Nutrient Availability, Toxicity and Wettability

Dieguez-Alonso, Alba; Funke, Axel; Anca-Couce, Andrés; Rombolà, Alessandro; Ojeda, Gerardo; Bachmann, Jörg; Behrendt, Frank

The impact of conversion process parameters in pyrolysis (maximum temperature, inert gas flow rate) and hydrothermal carbonization (maximum temperature, residence time and post-washing) on biochar and hydrochar properties is investigated. Pine wood (PW) and corn digestate (CD), with low and high inorganic species content respectively, are used as feedstock. CD biochars show lower H/C ratios, thermal recalcitrance and total specific surface area than PW biochars, but higher mesoporosity. CD and PW biochars present higher naphthalene and phenanthrene contents, respectively, which may indicate different reaction pathways. High temperatures (>500 °C) lead to lower PAH (polycyclic aromatic hydrocarbons) content (<12 mg/kg) and higher specific surface area. With increasing process severity the biochars carbon content is also enhanced, as well as the thermal stability. High inert gas flow rates increase the microporosity and wettability of biochars. In hydrochars the high inorganic content favor decarboxylation over dehydration reactions. Hydrochars show mainly mesoporosity, with a higher pore volume but generally lower specific surf ... mehr

Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -Technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1996-1073
URN: urn:nbn:de:swb:90-805813
KITopen ID: 1000080581
HGF-Programm 35.13.02; LK 01
Erschienen in Energies
Band 11
Heft 3
Seiten 496
Schlagworte pyrolysis; hydrothermal carbonization; biochar engineering; porosity; nutrients; polycyclic aromatic hydrocarbon (PAH)
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