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  Role of the Oxide Support on the Structural and Chemical Evolution of Fe Catalysts during the Hydrogenation of CO2

Lopez-Luna, M., Timoshenko, J., Kordus, D., Rettenmaier, C., Chee, S. W., Hoffman, A. S., et al. (2021). Role of the Oxide Support on the Structural and Chemical Evolution of Fe Catalysts during the Hydrogenation of CO2. ACS Catalysis, 11(10), 6175-6185. doi:10.1021/acscatal.1c01549.

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 Creators:
Lopez-Luna, Mauricio1, Author              
Timoshenko, Janis1, Author              
Kordus, David1, Author              
Rettenmaier, Clara1, Author              
Chee, See Wee1, Author              
Hoffman, Adam S.2, Author
Bare, Simon R.2, Author
Shaikhutdinov, Shamil K.1, Author              
Roldan Cuenya, Beatriz1, Author              
Affiliations:
1Interface Science, Fritz Haber Institute, Max Planck Society, ou_2461712              
2SSRL, SLAC National AcceleratorLaboratory, Menlo Park, California 94025, United States, ou_persistent22              

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 Abstract: Iron-based catalysts are considered active for the hydrogenation of CO2 toward high-order hydrocarbons. Here, we address the structural and chemical evolution of oxide-supported iron nanoparticles (NPs) during the activation stages and during the CO2 hydrogenation reaction. Fe NPs were deposited onto planar SiO2 and Al2O3 substrates by dip coating with a colloidal NP precursor and by physical vapor deposition of Fe. These model catalysts were studied in situ by near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) in pure O2, then in H2, and finally in the CO2 + H2 (1:3) reaction mixture in the mbar pressure range and at elevated temperatures. The NAP-XPS results revealed the preferential formation of Fe(III)- and Fe(II)-containing surface oxides under reaction conditions, independently of the initial degree of iron reduction prior to the reaction, suggesting that CO2 behaves as an oxidizing agent even in excess of hydrogen. The formation of the iron carbide phase, often reported for unsupported Fe catalysts in this reaction, was never observed in our systems, even on the samples exposed to industrially relevant pressure and temperature (e.g., 10 bar of CO2 + H2, 300 °C). Moreover, the same behavior is observed for Fe NPs deposited on nanocrystalline silica and alumina powder supports, which were monitored in situ by X-ray absorption spectroscopy (XAS). Our findings are assigned to the nanometer size of the Fe particles, which undergo strong interaction with the oxide support. The combined XPS and XAS results suggest that a core (metal-rich)–shell (oxide-rich) structure is formed within the Fe NPs during the CO2 hydrogenation reaction. The results highlight the important role played by the oxide support in the final structure and composition of nanosized catalysts.

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Language(s): eng - English
 Dates: 2021-04-052021-05-06
 Publication Status: Published online
 Pages: 11
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acscatal.1c01549
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Title: ACS Catalysis
  Abbreviation : ACS Catal.
Source Genre: Journal
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Publ. Info: Washington, DC : ACS
Pages: 11 Volume / Issue: 11 (10) Sequence Number: - Start / End Page: 6175 - 6185 Identifier: ISSN: 2155-5435
CoNE: https://pure.mpg.de/cone/journals/resource/2155-5435