A High Pressure Operando Spectroscopy Examination of Bimetal Interactions in ‘Metal Efficient’ Palladium/In2O3/Al2O3 Catalysts for CO2 Hydrogenation

Matthew E. Potter*, Sofia Mediavilla Madrigal, Emma Campbell, Lisa J. Allen, Urvashi Vyas, Stephen Parry, Adrián García-Zaragova, Luis M. Martínez-Prieto, Pascual Oña-Burgos, Mads Lützen, Christian D. Damsgaard, Enrique Rodríguez-Castellón, Nicola Schiaroli, Giuseppe Fornasari, Patricia Benito*, Andrew M. Beale*

*Corresponding author for this work

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Abstract

CO2 hydrogenation to methanol has the potential to serve as a sustainable route to a wide variety of hydrocarbons, fuels and plastics in the quest for net zero. Synergistic Pd/In2O3 (Palldium on Indium Oxide) catalysts show high CO2 conversion and methanol selectivity, enhancing methanol yield. The identity of the optimal active site for this reaction is unclear, either as a Pd−In alloy, proximate metals, or distinct sites. In this work, we demonstrate that metal-efficient Pd/In2O3 species dispersed on Al2O3 can match the performance of pure Pd/In2O3 systems. Further, we follow the evolution of both Pd and In sites, and surface species, under operando reaction conditions using X-ray Absorption Spectroscpy (XAS) and infrared (IR) spectroscopy. In doing so, we can determine both the nature of the active sites and the influence on the catalytic mechanism.

Original languageEnglish
Article numbere202312645
JournalAngewandte Chemie - International Edition
Volume62
Issue number45
Number of pages6
ISSN1433-7851
DOIs
Publication statusPublished - 2023

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