NDLI: Structural and elemental influence from various MOFs on the performance of Fe@C catalysts for Fischer

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Faraday Discussions Vol -99

Structural and elemental influence from various MOFs on the performance of Fe@C catalysts for Fischer–Tropsch synthesis

Content Provider	Royal Society of Chemistry (RSC)
Author	Wezendonk, Tim A. Ruitenbeek, Matthijs Gascon, Jorge Meima, Garry Kapteijn, Freek Santos, Vera P. Chojecki, Adam Warringa, Quirinus S. E. Makkee, Michiel
Copyright Year	2017
Abstract	The structure and elementary composition of various commercial Fe-based MOFs used as precursors for Fischer–Tropsch synthesis (FTS) catalysts have a large influence on the high-temperature FTS activity and selectivity of the resulting Fe on carbon composites. The selected Fe-MOF topologies (MIL-68, MIL-88A, MIL-100, MIL-101, MIL-127, and Fe-BTC) differ from each other in terms of porosity, surface area, Fe and heteroatom content, crystal density and thermal stability. They are re-engineered towards FTS catalysts by means of simple pyrolysis at 500 °C under a N2 atmosphere and afterwards characterized in terms of porosity, crystallite phase, bulk and surface Fe content, Fe nanoparticle size and oxidation state. We discovered that the Fe loading (36–46 wt%) and nanoparticle size (3.6–6.8 nm) of the obtained catalysts are directly related to the elementary composition and porosity of the initial MOFs. Furthermore, the carbonization leads to similar surface areas for the C matrix (SBET between 570 and 670 m2 g−1), whereas the pore width distribution is completely different for the various MOFs. The high catalytic performance (FTY in the range of 1.9–4.6 × 10−4 molCO gFe−1 s−1) of the resulting materials could be correlated to the Fe particle size and corresponding surface area, and only minor deactivation was found for the N-containing catalysts. Elemental analysis of the catalysts containing deliberately added promoters and inherent impurities from the commercial MOFs revealed the subtle interplay between Fe particle size and complex catalyst composition in order to obtain high activity and stability next to a low CH4 selectivity.
Starting Page	225
Ending Page	242
Page Count	18
File Format	HTM / HTML PDF
ISSN	13596640
Volume Number	197
Journal	Faraday Discussions
DOI	10.1039/c6fd00198j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Fischer Fischer\u2013Tropsch process Carbon Porosity Heteroatom Pyrolysis Crystallite Nanoparticle Carbonization Composite material Elemental analysis Interplay Entertainment
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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