The production of carbon-neutral fuels from CO2 presents an avenue for causing an appreciable effect in terms of volume toward the mitigation of global carbon emissions. To that end, the production of isoparaffin-rich fuels is highly desirable. Here, we demonstrate the potential of a multifunctional catalyst combination, consisting of a methanol producer (InCo) and a Znmodified zeolite beta, which produces a mostly isoparaffinic hydrocarbon mixture from CO2 (up to ∼85% isoparaffin selectivity among hydrocarbons) at a CO2 conversion of >15%. The catalyst combination was thoroughly characterized via an extensive complement of techniques. Specifically, operando X-ray absorption spectroscopy (XAS) reveals that Zn (which plays a crucial role of providing a hydrogenating function, improving the stability of the overall catalyst combination and isomerization performance) is likely present in the form of Zn6O6 clusters within the zeolite component, in contrast to previously reported estimations.
|Original language||English (US)|
|State||Published - Oct 6 2021|
Bibliographical noteKAUST Repository Item: Exported on 2021-10-12
Acknowledgements: We thank Dr. Jullian Vittenet for carrying out ICP measurements of the samples. We also thank Sandra Ramirez Cherbuy for creating the graphical abstract of this manuscript. Janis Timoshenko is warmly thanked for his initial guidance in preparing the EvAX code input files to perform the EA-RMC calculations. The authors gratefully acknowledge the SOLEIL Synchrotron (Gif-sur-Yvette, France) for the provision of
beamtime (proposal: 20190854) for XAS experiments carried out on the SAMBA beamline and the support of their staff.