Journal
CATALYSTS
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/catal12101127
Keywords
hybrid composite; CO2 hydrogenation; carbon monoxide; CO selectivity; oxygen vacancies
Categories
Funding
- Ministry of Science and Technology, Taiwan [MOST 109-2923-E-007-005, MOST 109-3116-F-007-001, MOST 109-2112-M-007-030-MY3]
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In this study, a novel nanocatalyst consisting of oxygen vacancy-enriched CoPd hybrid cluster and cobalt oxide support was proposed for CO2 hydrogenation to CO. The results showed that the catalyst could initiate the reaction at lower temperature and achieve high CO production yield and selectivity.
Catalytic carbon dioxide (CO2) hydrogenation to carbon monoxide (CO) via reverse water-gas shift (RWGS) reaction is of particular interest due to its direct use in various industrial processes as feedstock. However, the competitive CO2 methanation process severely limits the RWGS reaction in a lower temperature range. In this context, we propose a novel nanocatalyst (NC) comprising oxygen vacancy-enriched subnanometer-scale CoPd hybrid cluster ((CoOxPd)-Pd-V)-anchored Pd nanoparticles (NPs) on cobalt oxide support underneath (denoted as CP-(CoOxPd)-Pd-V) by using a galvanic replacement reaction-assisted wet chemical reduction method. As-developed CP-(CoOxPd)-Pd-V NC initiated the RWGS reaction at 423 K temperature while showing an optimum CO production yield of similar to 3414 mu mol g(catalyst)(-1) and a CO selectivity as high as similar to 99% at 523 K in the reaction gas of CO2:H-2 = 1:3. The results of physical characterizations along with electrochemical and gas chromatography (GC) suggest that abundant oxygen vacancies in the surface-anchored (CoOxPd)-Pd-V clusters are vital for CO2 adsorption and subsequent activation, while neighboring Pd domains facilitate the H-2 dissociation. The obtained results are expected to provide a feasible design of Co-based NCs for the RWGS reaction.
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