Influence of Chemical Composition on the Catalytic Activity of Small Bimetallic FeRu Nanoparticles for Fischer–Tropsch Syntheses

Abstract

FeRu nanoparticles were prepared according to an organometallic route using {Fe[N(Si(CH 3) 3) 2 ] 2 } 2 and (g 4-1,5-cyclooctadiene)(g 6-1,3,5-cyclooctatriene) ruthenium(0) Ru(COD)(COT) precursors followed by their insertion into a mesoporous MCF-17 support host. The resulting nanoparticles had a uniform size of approximately 2 nm, with a relative Ru amount of up to 33 at.%. Steadystate Fischer-Tropsch catalysis at 6 bar total pressure (H 2 / CO = 1:1) demonstrated light olefins production with a selectivity close to 50 % (ex. CO 2) for catalysts with low Ru content (5 at.%). The selectivity pattern changed to long chain-paraffin production with increasing Ru amounts. These catalysts were also more active than those containing few Ru. X-ray photoelectron spectroscopy showed under-parity Ru amounts to effectively cover the surface of Fe nanoparticles. The nanoparticle distribution inside the MFC-17 host was characterized by microtomia/ transmission electron microscopy.

Engineering of Ruthenium–Iron Oxide Colloidal Heterostructures: Improved Yields in CO2 Hydrogenation to Hydrocarbons

“…In order to improve the activity of iron‐based catalysts, various metal promoters and alloys of iron with different metals have been studied. Particular attention has been paid to alloying iron with ruthenium owing to two main reasons: first, ruthenium is the most active FT metal, thus its addition is expected to increase conversion in iron‐based systems; second, alloying iron with ruthenium results in a change in the electronic d‐band structure that can give rise to distinct catalytic properties …”

Bimetallic Nickel‐Iridium and Nickel‐Osmium Alloy Nanoparticles and Their Catalytic Performance in Hydrogenation Reactions

“…[1] Specific examples include the systems of Fe-Ru for efficient Fischer-Tropsch synthesis, [2] Al-Fe as aP d-free hydrogenation catalyst, [3] Rh-Pd for selectiveC Oo xidation, [4] and Pt-Co for renewable fuel generation [5] or the activation of Au in bimetallic systems. [6] Several studies have also demonstrated that bimetallic nanoparticles can outperform their monometallic counterparts.…”

“…[6] Several studies have also demonstrated that bimetallic nanoparticles can outperform their monometallic counterparts. [2][3][4][5][6][7] Specific intermetallic interactions in these alloyed or core-shell-type systemsw ere postulated to resulti ns ynergistic effects. This can include at uned electronic or geometric structure as well as an improved thermal or chemical stability.…”

“…As ar esult, bimetallicnanocatalysts did not only display the combined properties of the pure components but rather exhibit as ignificantly higher catalytic performance in terms of activity,s electivity, and so on. [2][3][4][5][6][7] In some cases, the catalytic performance could be improved even if one of the constituents was less active or even inactive for ac ertain reaction.…”

“…[1][2][3][4][5][6][7] Therefore, the alloyingo fp recious metals with an abundant, less-precious metal is of particular interestn ot only to improvet he catalytic properties but also for effective cost reduction. [8] In contrastt ob imetallic M-Pd or M-Pt systems (M:m etal), bimetallic systems of Ir and Os have been barely addressed, in general.…”