Co–Ni Alloy Nanoparticles on La-Doped SiO₂ for Direct Ethanol Synthesis from Syngas

Abstract

In this work, Ni−Co alloy nanoparticles (NPs) on La-doped SiO 2 showed excellent selectivity toward ethanol for direct ethanol synthesis via CO hydrogenation. Over the catalyst with an optimal ratio of Ni/Co, the total alcohol selectivity reached 33.5%, of which ethanol occupied 47.0 wt %. The results demonstrated that the interaction between Co and Ni improved the ability to activate H 2 and CO and adjusted the amount of the dissociatively and associatively adsorbed CO. Besides, the mutual dilution of nickel and cobalt in Ni−Co alloy NPs effectively reduced the isolated Co or Ni-clusters; thus, the formation of heavy hydrocarbons was suppressed. In the reaction process, Ni@Co−Co 2 C, a core−shell composite with a nickel core and Co−Co 2 C shell, was formed, which suppressed the loss of nickel species. Moreover, with the reaction going on, a small amount of poorly alloyed Co-clusters would be covered gradually by the formed coke, resulting in an increase in alcohol selectivity.

LaAlO3-Tailored Active Pairs of Co0–Coδ+ Supported on ZrO2 for Higher Alcohol Synthesis from Syngas

“…The structure of PTOs has two significant advantages: (1) homogeneous dispersion of metal ions and (2) inclining to interact with the metals reduced from the PTOs’ lattice . LaCo 1– x Ni x O 3 /SiO 2 was prepared for direct ethanol synthesis from syngas; the selectivity of the total alcohol reached 33.5%, of which ethanol occupied 47.0 wt % . LaFe 1– x Rh x O 3 /SiO 2 was used as the precursor for direct ethanol synthesis from syngas and the selectivity of total alcohols reached 71% .…”

“…30 LaCo 1−x Ni x O 3 /SiO 2 was prepared for direct ethanol synthesis from syngas; the selectivity of the total alcohol reached 33.5%, of which ethanol occupied 47.0 wt %. 37 LaFe 1−x Rh x O 3 /SiO 2 was used as the precursor for direct ethanol synthesis from syngas and the selectivity of total alcohols reached 71%. 38 Therefore, PTOs were used as the catalysts' precursors in our works.…”

The effect of support on RhFe/Al2O3 for ethanol synthesis via CO hydrogenation

“…Ethanol synthesis via syngas directly has attracted a great deal of attentions in recent years [1][2][3]. However, there is still a challenge for improving the selectivity of catalysts.…”