Active phase distribution changes within a catalyst particle during Fischer–Tropsch synthesis as revealed by multi-scale microscopy

Cats, K. H.; Andrews, J. C.; Stephan, O.; March, K.; Karunakaran, C.; Meirer, F.; de Groot, F. M. F.; Weckhuysen, B. M.

doi:10.1039/C5CY01524C

Title: Active phase distribution changes within a catalyst particle during Fischer–Tropsch synthesis as revealed by multi-scale microscopy

Journal Article · Tue Feb 16 00:00:00 EST 2016 · Catalysis Science and Technology

DOI:https://doi.org/10.1039/C5CY01524C· OSTI ID:1251402

Cats, K. H. ^[1]; Andrews, J. C. ^[2]; Stephan, O. ^[3]; March, K. ^[3]; Karunakaran, C. ^[4]; Meirer, F. ^[1]; de Groot, F. M. F. ^[1]; Weckhuysen, B. M. ^[1]

Utrecht Univ., Utrecht (The Netherlands)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. Paris Sud, Orsay (France)
Canadian Light Source, Saskatoon (Canada)

In this study, the Fischer-Tropsch synthesis (FTS) reaction is one of the most promising processes to convert alternative energy sources, such as natural gas, coal or biomass, into liquid fuels and other high-value products. Despite its commercial implementation, we still lack fundamental insights into the various deactivation processes taking place during FTS. In this work, a combination of three methods for studying single catalyst particles at different length scales has been developed and applied to study the deactivation of Co/TiO₂ Fischer-Tropsch synthesis (FTS) catalysts. By combining transmission X-ray microscopy (TXM), scanning transmission X-ray microscopy (STXM) and scanning transmission electron microscopy-electron energy loss spectroscopy (STEM-EELS) we visualized changes in the structure, aggregate size and distribution of supported Co nanoparticles that occur during FTS. At the microscale, Co nanoparticle aggregates are transported over several μm leading to a more homogeneous Co distribution, while at the nanoscale Co forms a thin layer of ~1-2 nm around the TiO₂ support. The formation of the Co layer is the opposite case to the “classical” strong metal-support interaction (SMSI) in which TiO₂ surrounds the Co, and is possibly related to the surface oxidation of Co metal nanoparticles in combination with coke formation. In other words, the observed migration and formation of a thin CoO_x layer are similar to a previously discussed reaction-induced spreading of metal oxides across a TiO₂ surface.

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: VICI, AC02-76SF00515

OSTI ID:: 1251402

Journal Information:: Catalysis Science and Technology, Vol. 1021, Issue C; ISSN 2044-4753

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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