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  Surface Lewis Acidity of Periphery Oxide Species as a General Kinetic Descriptor for CO2 Hydrogenation to Methanol on Supported Copper Nanoparticles

Kim, J., Sarma, B. B., Andrés, E., Pfänder, N., Concepción, P., & Prieto, G. (2019). Surface Lewis Acidity of Periphery Oxide Species as a General Kinetic Descriptor for CO2 Hydrogenation to Methanol on Supported Copper Nanoparticles. ACS Catalysis, 9(11), 10409-10417. doi:10.1021/acscatal.9b02412.

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 Creators:
Kim, Jonglack1, Author              
Sarma, Bidyut B.2, Author              
Andrés, Eva2, Author              
Pfänder, Norbert3, Author              
Concepción, Patricia4, Author
Prieto, Gonzalo1, 4, Author              
Affiliations:
1Research Group Prieto, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_2243639              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
3Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society, ou_3023874              
4ITQ Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC), Avenida de los Naranjos s/n, 46022 Valencia, Spain, ou_persistent22              

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Free keywords: copper catalysts; CO2 recycling; support effects; interfacial catalysis; structure−performance relations; in situ FTIR
 Abstract: Oxide-supported copper nanoparticles exhibit promising properties as catalysts for the selective hydrogenation of CO2 to methanol. Both reaction rate and selectivity depend conspicuously on the nature of the oxide support/promoter at the metal periphery. However, a major challenge is the achievement of a quantitative description of such metal/oxide promotion effects, which is an essential step toward a rational catalyst design. We investigate structure–performance relationships with a series of model catalysts consisting of Cu nanoparticles dispersed on a mesoporous γ-Al2O3 carrier overlaid with different transition metal oxides spanning a broad range of Lewis acidity (YOx, ScOx, ZrOx, TaOx). Remarkably, the apparent activation energy (Ea) for methanol formation is found to downscale linearly with the relative Lewis acidity of coordinatively unsaturated metal surface sites (cus) exposed on the oxide support, making this single physicochemical parameter a suitable reactivity descriptor in the whole study space. In correspondence with this performance trend, in situ Fourier transform infrared spectroscopy reveals that both the ionic character and the relative reactivity of bidentate formate species, developed on the catalyst surface under reaction conditions, vary systematically with the surface Lewis acidity of the oxide support. These findings support the involvement of oxide-adsorbed bidentate formate species as reaction intermediates and point to the relative electron-accepting character of the Lewis cus on the oxide surface as the factor determining the stability of these intermediates and the overall energy barrier for the reaction. Our results contribute a unifying and quantitative description for support effects in CO2 hydrogenation to methanol on oxide-supported copper nanoparticles and provide a blueprint for a predictive description of metal-oxide promotion effects, which are ubiquitous in heterogeneous catalysis.

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Language(s): eng - English
 Dates: 2019-06-102019-10-082019-11-01
 Publication Status: Published online
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acscatal.9b02412
 Degree: -

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Title: ACS Catalysis
  Abbreviation : ACS Catal.
Source Genre: Journal
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Publ. Info: Washington, DC : ACS
Pages: - Volume / Issue: 9 (11) Sequence Number: - Start / End Page: 10409 - 10417 Identifier: ISSN: 2155-5435
CoNE: https://pure.mpg.de/cone/journals/resource/2155-5435