Abstract
The metal oxide promoter decisively influences the overall performance of Fe catalysts in the direct hydrogenation of CO2 to C5+ hydrocarbons. However, the roles of metal oxide promoter for Fe catalysts, particularly ZrO2, have rarely been investigated. To plug this knowledge gap, a new Fe catalyst promoted with Na and partially reduced ZrOx (Na-FeZrOx-9) was developed in this study; the catalyst helped produce C5+ hydrocarbons in remarkably high yield (26.3% at 360 °C). In contrast to ZrOx-free Fe-oxide, Na-FeZrOx-9 exhibited long-term stability for CO2 hydrogenation (750 h on-stream). The findings revealed multiple roles of ZrOx. Notably, ZrOx decorated the Fe-oxide particles after calcination, thereby suppressing excess particle aggregation during the reaction, and acted as a “coke remover” to eliminate the carbon deposited on the catalyst surface. Additionally, oxygen vacancy (Ov) sites in ZrOx and electron transfer from ZrOx to Fe sites facilitated the adsorption of CO2 at the Zr-Fe interface.
Published Version
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