Catalytic Conversion Furfuryl Alcohol to Tetrahydrofurfuryl
Alcohol and 2‑Methylfuran at Terrace, Step, and Corner Sites
on Ni
Posted on 2020-06-18 - 16:15
The surface structures
at catalytic sites are critical factors
for determining catalytic selectivity. Here, we use periodic density
functional theory and microkinetic modeling to systematically investigate
the effect of surface structures on the conversion of furfuryl alcohol
(FA). We consider nine surface terminations of Ni with various coordination
numbers representing terrace, step, and corner sites. We study three
reaction paths for FA conversion on various surfaces and find that
the surface structure impacts the adsorption configuration and causes
significant differences in selectivity. Barrier height analysis shows
that terrace sites favor hydrogenation to tetrahydrofurfuryl alcohol
(THFA), whereas corner sites favor C–OH bond scission to produce
2-methylfuran (2-MF); step sites show similar barriers for the two
reactions. We explain this by identifying three characteristics of
the reactant adsorption structures that have a significant effect
on selectivity, namely, that a shorter distance between the adsorbed
hydrogen atom and the C3 carbon of FA favors hydrogenation to produce
THFA, and more negative charge transfer to Oalcohol and
a longer C–Oalcohol bond length favor C–Oalcohol bond scission to produce 2-MF. Since the reactions
have similar barriers at a step site, microkinetic calculations are
employed to calculate the product selectivity on a step site under
experimental conditions. At lower temperatures and higher generalized
coordination number (CN), THFA
is the most favorable product, while the selectivity to 2-MF is higher
at lower CN and at higher temperature.
This work provides guidance for the rational design catalysts to control
the product distribution of FA conversion.
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Chen, Lifang; Ye, Jingyun; Yang, Yusen; Yin, Pan; Feng, Haisong; Chen, Chunyuan; et al. (2020). Catalytic Conversion Furfuryl Alcohol to Tetrahydrofurfuryl
Alcohol and 2‑Methylfuran at Terrace, Step, and Corner Sites
on Ni. ACS Publications. Collection. https://doi.org/10.1021/acscatal.0c01441
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AUTHORS (9)
LC
Lifang Chen
JY
Jingyun Ye
YY
Yusen Yang
PY
Pan Yin
HF
Haisong Feng
CC
Chunyuan Chen
XZ
Xin Zhang
MW
Min Wei
DT
Donald G. Truhlar