In-Situ Formation of Fe Nanoparticles from FeOOH Nanosheets
on γ‑Al2O3 as Efficient Catalysts
for Ammonia Synthesis
Version 2 2017-12-14, 18:23
Version 1 2017-10-25, 14:11
Posted on 2017-12-14 - 18:23
The
preparation process of industrial Fe-based catalysts for ammonia
synthesis involves energy-intense and sophisticated treatments. It
is thus highly desirable to develop new catalysts with sufficient
catalytic performance within smart and more economic approaches. Herein,
γ-Al2O3-supported FeOOH nanosheets are
employed for the first time as ammonia synthesis catalysts. To monitor
the potential of these new materials, unsupported FeOOH and K-promoted
catalysts are additionally investigated for comparison. While no activity
is observed from the unsupported catalyst, the activity of γ-Al2O3-supported catalysts shows an inverse relationship
with respect to the amount of Fe. Upon correlation of the catalytic
performance with the final state of catalysts, the activity is closely
related to the particle size of metallic Fe. Higher activity and lower
apparent activation energy can be reached for smaller nanoparticles
that are likely to contain more step–kink structures serving
as active sites. The best catalytic performance is obtained for a
K-promoted catalyst which shows an activity about 18 times higher
compared to that of the corresponding unpromoted one (at 425 °C).
We conclude that, in addition to the nanostructured character of the
Fe, the modifications of its electronic and surface structures induced
by the K-promoter are responsible for this enhanced activity.
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Fan, Hua; Huang, Xing; Kähler, Kevin; Folke, Jan; Girgsdies, Frank; Teschner, Detre; et al. (2017). In-Situ Formation of Fe Nanoparticles from FeOOH Nanosheets
on γ‑Al2O3 as Efficient Catalysts
for Ammonia Synthesis. ACS Publications. Collection. https://doi.org/10.1021/acssuschemeng.7b02812
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AUTHORS (10)
HF
Hua Fan
XH
Xing Huang
KK
Kevin Kähler
JF
Jan Folke
FG
Frank Girgsdies
DT
Detre Teschner
YD
Yuxiao Ding
KH
Klaus Hermann
RS
Robert Schlögl
EF
Elias Frei
KEYWORDS
ammonia synthesisK-promoted catalystsperformanceFe-based catalysts18 timesγ- Al 2 O 3K-promoted catalystpreparation processFe Nanoparticlesammonia synthesis catalystsAmmonia Synthesissurface structuresFeOOH Nanosheetsparticle sizeEfficient CatalystsIn-Situ Formationactivation energyFeOOH nanosheetsnanostructured character