Although using supported
noble-metal catalysts for CO2 hydrogenation is an effective
solution due to their excellent catalytic
properties, metal oxide supports themselves can exhibit good activity
being more economically feasible. This work focuses on investigating
the complexity of the Co3O4 system during the
CO2 methanation reaction, which is usually accompanied
by the formation of unstable dispersions of cobalt oxide and metallic
Co. Herein, we have tested different types of Co3O4: synthetically prepared mesoporous m-Co3O4 (BET surface area, 95 m2/g) and commercial c-Co3O4 (BET surface area, 15 m2/g; purchased
from Merck) in the CO2 methanation reaction under different
reduction temperatures (273–673 K). The reduction temperature
was adjusted to 573 K for both the catalysts to reach the optimal
Co/cobalt oxide ratio and consequently the best catalytic performance.
m-Co3O4 is more active (CO2 conversion
95%) and stable at higher temperatures compared to c-Co3O4 (CO2 conversion 63%) due to its morphology-induced
∼66 times higher surface basicity. DRIFTS results showed differences
in the detected surface species: formate was observed on m-Co3O4 and was proven to contribute to the total methane
formation. It was revealed that in CO2 methanation reaction,
both bulk and surface properties such as morphology, cobalt oxidation
states, acid–base properties, and presence of defect sites
directly affect the catalytic performance and reaction mechanism.
Furthermore, 1% 5 nm Pt nanoparticles were loaded onto the Co3O4s to check the competitiveness of the catalysts.
This study evidences on a cheap noble-metal-free catalyst for CO2 methanation consisting of m-Co3O4 with
competitive activity and ∼100% CH4 selectivity.
Title Pt nanoparticles-loaded and noble-metal-free, mesoporous oxides as efficient catalysts for CO2 hydrogenation and dry reforming with methane Short title Noble-metal-free, mesoporous oxides for CO2 activation reactions Article type Full Length Article
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