10.1021/acssuschemeng.7b01895.s001
Catalina Rodríguez
Correa
Catalina
Rodríguez
Correa
Moritz Stollovsky
Moritz
Stollovsky
Tobias Hehr
Tobias
Hehr
Yannik Rauscher
Yannik
Rauscher
Birgit Rolli
Birgit
Rolli
Andrea Kruse
Andrea
Kruse
Influence of the Carbonization Process on Activated
Carbon Properties from Lignin and Lignin-Rich Biomasses
American Chemical Society
2017
KOH
surface area
carbonization process
Pyrolysis chars
Carbonization Process
carbonization reactions
microporous surface areas
hydrothermal carbonization chars
AC properties
beech wood
Activated Carbon Properties
pine bark
surface chemistry
hydrochar ACs
carbon content
oak bark
alkali-catalyzed gasification
Lignin-Rich Biomasses Lignin-rich biomass
pyrochar ACs
chemical activation
hydrothermal carbonization
2017-07-28 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Influence_of_the_Carbonization_Process_on_Activated_Carbon_Properties_from_Lignin_and_Lignin-Rich_Biomasses/5297554
Lignin-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.