a b s t r a c tHigher alcohol synthesis from syngas is studied over K/MoS 2 domains supported on mesoporous carbon (C), mixed MgAl oxide (MMO), or mixtures thereof. While the carbon support offers high ethanol productivity, the MMO support yields enhanced C 3+ OH selectivity. MoKMMO-C, whereby Mo is initially contained on MMO then ground with carbon, behaves similar to the parent MoKMMO catalyst, as Mo on MMO has limited mobility during reaction. In contrast, on MoKC-MMO, significant Mo migrates from C to MMO during reaction, giving reactivity associated with Mo species on both supports (high C 3+ OH selectivity and productivity). MoS 2 domain structures are correlated with the selectivity of the catalysts (C 3+ OH selectivity $ double MoS 2 layers, total hydrocarbon selectivity $ single MoS 2 layers). This study advances the understanding of the support's effect on structure-reactivity relationships for this family of catalysts and introduces a new catalyst composition with desirable reactivity.
The hydrogenation of furfural is investigated over various reduced nickel mixed metal oxides derived from layered double hydroxides (LDHs) containing Ni-Mg-Al and Ni-CoAl. Upon reduction, relatively large Ni(0) domains develop in the Ni-Mg-Al catalysts, whereas in the Ni-CoAl catalysts smaller metal particles of Ni(0) and Co(0), potentially as alloys, are formed, as evidenced by XAS, XPS, STEM and EELS. All the reduced Ni catalysts display similar selectivities towards major hydrogenation products (furfuryl alcohol and tetrahydrofurfuryl alcohol), though the side products varied with the catalyst composition. The 1.1Ni-0.8Co-Al catalyst showed the greatest activity per titrated site when compared to the other catalysts, with promising activity compared to related catalysts in the literature. The use of base metal catalysts for hydrogenation of furanic compounds may be a promising alternative to the well-studied precious metal catalysts for making biomass-derived chemicals if catalyst selectivity can be improved in future work by alloying or tuning metal-oxide support interactions.
Reaction pathways for higher alcohol synthesis from syngas are studied over K/MoS2 domains supported on mesoporous carbon (C) and mixed MgAl oxide (MMO) via addition of methanol, ethanol, and ethylene co-feeds.
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