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Mutual Tailored Bimetallic Rh–Co Supported on La Modified SiO₂ for Direct Ethanol Synthesis from Syngas

Zhong, Huixian, Wang, Jiaming, Guo, Shaoxia, Fang, Kegong, Liu, Yuan
Industrial & engineering chemistry process design and development 2019 v.58 no.8 pp. 2631-2643
active sites, carbon, carbon monoxide, catalysts, cobalt, ethanol, nanoparticles, process design, rhodium, silica, synthesis gas
In this work, Rh–Co/La₂O₃–SiO₂ showed excellent selectivity to ethanol for direct ethanol synthesis from syngas. The best catalyst exhibited 42.8% selectivity to ethanol with CO conversion of 12.3% and in 145 h’ running maintained stable at 553 K, 3 MPa and GHSV of 3900 mL (gcₐₜ h)⁻¹. The investigate results indicated that the interaction of cobalt denoting electron to rhodium adjusted the amounts of carbon monoxide adsorbed associatively and dissociatively, and maybe created a new active site pair of Rh⁰/Coᵟ⁺ for generating ethanol. Moreover, the mutually doping effect could dilute Co and Rh atoms in Rh–Co nanoparticles (NPs), which effectively suppressed the formation of C₂₊H and C₃₊OH, and thus led to the high ethanol selectivity and good anticoking property assisting with the carbon eliminating effect of La₂O₃. Owing to the high dispersion of Rh–Co NPs, the catalyst showed good activity and high resistance to sintering.