Abstract
CO2 hydrogenation presents a crucial pathway for carbon circularity. The activation, adsorption, and hydrogen spillover are key processes in CO2 hydrogenation. This study investigates the effects of hydrogen spillover induced by Pt on CO2 hydrogenation over Pt-promoted Co-Al catalysts. A series of Pt-promoted Co-Al catalysts were synthesized via co-precipitation and employed for CO2 hydrogenation. The optimized Pt-promoted Co-Al catalyst efficiently converts CO2, leading to the formation of methane (46.6mmol gcat−1 h−1), methanol (509.4 μmol gcat−1 h−1), and higher alcohols (220.6 μmol gcat−1 h−1). The Pt-promoted Co-Al catalysts facilitate hydrogen spillover, optimizing the catalysts’ reducibility and exposing more active sites. Moreover, the hydrogen adsorption is weakened due to the Pt induced hydrogen spillover, which facilitates the formation of *HCOO, *CH3, and *CO intermediates. This in turn facilitate the coupling between *HCOO/*CO and *CH3, enhancing the formation of higher alcohols.
Published Version
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