The effect of SnO2 surface properties on CO2 photoreduction to higher hydrocarbons.
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2023
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Several photocatalysts have been developed for applications in
reduction reactions, including tin oxide-based semiconductors.
Although its band structure is unfavorable for CO2 reduction
reactions, strategies to modify its surface properties directly
impacted its activity and selectivity during these reactions.
Here, we analyze the influence of heat treatment and
decoration of SnO2 with gold nanoparticles on the gas phase
CO2 photoreduction process. In both cases, a deleterious effect
was observed during reactions under UV radiation (with a drop
of 59.81% and 51.45% in CH4 production for SnO2_150°C and
SnO2/Au_cop, respectively, compared to SnO2_cop), which is
directly related to the availability of surface hydroxyl groups
that play a crucial role in CO2 adsorption. Under visible
radiation, the gold plasmonic resonance took place in the
production of methane (0.33 μmolg 1 for SnO2/Au_cop and
0.29 μmolg 1 for SnO2/Au_150°C), with small amounts of
carbon monoxide (0.06 μmolg 1 for SnO2/Au_cop and
0.03 μmolg 1 for SnO2/Au_150°C). These results demonstrate
that, though the SnO2 band structure does not indicate a good
semiconductor for CO2 reduction, its surface characteristics are
responsible for its catalytic activity.
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TORRES, J. A. et al. The effect of SnO2 surface properties on CO2 photoreduction to higher hydrocarbons. ChemCatChem, v. 15, n. 6, artigo e202201534, mar. 2023. Disponível em: <https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/cctc.202201534>. Acesso em: 01 ago. 2023.