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Influence of the Carbonization Process on Activated Carbon Properties from Lignin and Lignin-Rich Biomasses
journal contribution
posted on 2017-07-28, 00:00 authored by Catalina Rodríguez
Correa, Moritz Stollovsky, Tobias Hehr, Yannik Rauscher, Birgit Rolli, Andrea KruseLignin-rich
biomass (beech wood, pine bark, and oak bark) and four
lignins were tested as precursors to produce activated carbon (AC)
via a two-step chemical activation with KOH. First, the precursors
were carbonized via either pyrolysis or hydrothermal carbonization,
with the purpose of evaluating the influence of the carbonization
process on the AC properties. Pyrolysis chars (pyrochars) were thermally
more stable than hydrothermal carbonization chars (hydrochars); thus,
more AC was yielded from pyrochars (AC yield calculated from the char
amount). The difference between ACs from hydrochars and pyrochars
was small regarding the AC yield calculated from the initial amount
of biomass or lignin. Additionally, no considerable differences in
terms of total surface area and surface chemistry were found between
both ACs. To understand this, the mechanism of the activation was
explained as a local alkali-catalyzed gasification. In the case of
hydrochar, carbonization reactions occurred simultaneously to the
gasification because of their lower thermal stability. Thus, the carbon
content and yields of hydrochar ACs were similar to pyrochar ACs,
but their microporous surface areas were lower, likely due to condensation
of volatile matter.
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KOHsurface areacarbonization processPyrolysis charsCarbonization Processcarbonization reactionsmicroporous surface areashydrothermal carbonization charsAC propertiesbeech woodActivated Carbon Propertiespine barksurface chemistryhydrochar ACscarbon contentoak barkalkali-catalyzed gasificationLignin-Rich Biomasses Lignin-rich biomasspyrochar ACschemical activationhydrothermal carbonization
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