NDLI: Ruthenium particle size and cesium promotion effects in Fischer–Tropsch synthesis over high-surface-area graphite supported catalysts

Content Provider	Royal Society of Chemistry (RSC)
Author	Gascon, Jorge Rodríguez-Ramos, Inmaculada Kapteijn, Freek Sun, Xiaohui Eslava, José L.
Copyright Year	2017
Abstract	The effect of ruthenium particle size on Fischer–Tropsch synthesis (FTS) has been studied at 513 K, H2/CO = 2 and 15 bar. Supported Ru catalysts with particle sizes ranging from 1.7 to 12 nm were prepared by using different Ru loadings and two different high surface area graphite (HSAG) supports to minimize the metal–support interaction. In addition, the effect of promotion with Cs is also evaluated. Microcalorimetric characterization during CO adsorption and XPS reveal a clear interaction between Ru and Cs. The FTS with Ru-based catalysts is, independent of the presence of promoter, highly structure-sensitive when the Ru particle size is under 7 nm. In this range the turnover frequency (TOF) for CO conversion increases with particle size, reaching a near constant value for Ru particles larger than 7 nm. Cs promoted catalysts display lower TOF values than the corresponding unpromoted samples. This somewhat reduced activity is attributed to the stronger CO adsorption on Cs promoted catalysts, as demonstrated by CO adsorption microcalorimetry. Product selectivity depends also on Ru particle size. Selectivity to C5+ hydrocarbons increases with increasing Ru particle size. For Cs-promoted catalysts, the olefin to paraffin ratio in the C2–C4 hydrocarbons range is independent of the Ru particle size, whereas it decreases for the unpromoted catalysts, showing the prevailing influence of the promoter.
Starting Page	1235
Ending Page	1244
Page Count	10
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	7
Issue Number	5
Journal	Catalysis Science & Technology
DOI	10.1039/c6cy02535h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cs Ruthenium Alkene Adsorption Fischer Graphite Alkane Product selectivity Fischer\u2013Tropsch process
Content Type	Text
Resource Type	Article
Subject	Catalysis

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