Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 340, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2023.123243
Keywords
Dry reforming; Methane; Carbon dioxide; Oxygen vacancies; Active oxygen species
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In this study, a defect-rich Ni-Pt/CeO2 catalyst with oxygen vacancy sites was synthesized using a one-pot complex combustion method. The catalyst exhibited high activity for CO2 dissociation at low temperature. Comparisons with conventionally impregnated catalysts demonstrated superior catalytic properties and stability.
Herein, we demonstrated a one-pot complex combustion method to synthesize defect-rich Ni-Pt/CeO2 catalyst having oxygen vacancy sites (V-o) by incorporating Ni and Pt species into the ceria lattice. These V-o sites are highly active for dissociating CO2 into reactive oxygen species and CO at low temperature. CH4-TPSR demonstrated that surface reactive oxygen species are more selective than lattice oxygen toward the formation of syngas. The catalytic properties and activity of the synthesized catalysts were also compared with the conventionally impregnated catalyst. In-situ DRIFT and Raman study revealed reactive oxygen-assisted CH4 activation via the formation of CHxO intermediate. DFT calculation also showed the facile formation of CH3O and CH2O species over the bimetallic NiPt-CeO2(111) catalyst surface. The Ni-Pt/CeO2 (0.5 wt%Pt-2 wt%Ni) catalyst showed superior activity and stability with similar to 86% conversion of CH4 and CO2 at 675 degrees C, where the H-2/CO ratio is one. The catalyst was stable up to 700 h time-on-stream.
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