Role of Co2C in ZnO-promoted Co Catalysts for Alcohol Synthesis from Syngas

Singh, Joseph A.; Hoffman, Adam S.; Schumann, Julia; Boubnov, Alexey; Asundi, Arun S.; Nathan, Sindhu S.; Nørskov, Jens; Bare, Simon R.; Bent, Stacey F.

doi:10.1002/cctc.201801724

Title: Role of Co₂C in ZnO-promoted Co Catalysts for Alcohol Synthesis from Syngas

Journal Article · 03 December 2018 · ChemCatChem

DOI: https://doi.org/10.1002/cctc.201801724 · OSTI ID:1507160

Singh, Joseph A. ^[1];

^[2]; Schumann, Julia ^[1]; Boubnov, Alexey ^[2]; Asundi, Arun S. ^[1]; Nathan, Sindhu S. ^[1]; Nørskov, Jens ^[3];

^[2];

^[1]

Stanford Univ., Stanford, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stanford Univ., Stanford, CA (United States); Technical Univ. of Denmark Kongens, Lyngby (Denmark)

Controlling selectivity is a key goal in the design of a heterogeneous catalyst. Herein, we present detailed characterization and activity of silica–supported cobalt catalysts modified by atomic layer deposition of ZnO. After reduction, the resulting catalysts exhibit substantial selectivity towards alcohol production during CO hydrogenation compared to catalysts containing only cobalt. The prepared catalysts have up to 46 % selectivity toward alcohols with 39 % of the alcohols corresponding to ethanol and other higher alcohols, albeit with reduced activity. In situ characterization of the catalyst by X–ray diffraction and X–ray absorption spectroscopy reveals details on the structural evolution in syngas, CO+H₂, and shows that ZnO promotion of Co results in the formation of Co₂C under catalytic conditions. A mechanism is proposed, supported by density functional theory calculations, which explains Co₂C formation by the blocking of Co step sites by Zn species. The ZnO acts a dual promoter both by facilitating Co₂C formation and by modifying the resulting Co₂C. In conclusion, the Co₂C formed from the ZnOpromoted Co catalysts displays improved thermal stability and selectivity compared with similar Co₂C catalysts without Zn.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1507160

Journal Information:: ChemCatChem, Journal Name: ChemCatChem Journal Issue: 2 Vol. 11; ISSN 1867-3880

Publisher:: ChemPubSoc EuropeCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Title: Role of Co2C in ZnO-promoted Co Catalysts for Alcohol Synthesis from Syngas

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Title: Role of Co₂C in ZnO-promoted Co Catalysts for Alcohol Synthesis from Syngas