Promoted Rh nanocrystal-incorporated carbon sphere catalysts for higher alcohol synthesis

et al. 2020

Energy Tech

In view of the dual active sites mechanism of direct ethanol synthesis and the excellent catalytic performance of bimetallic catalysts, a series of Ni–Fe alloy catalysts with different Ni/Fe molar ratios derived from layered double hydroxides (LDHs) precursors are synthesized. During the calcination and reduction process of LDHs precursors, the Ni–Fe alloy is obtained, and attributed to all the elements being evenly dispersed at the atomic level in the LDHs precursors; meanwhile, a strong interaction between Ni–Fe alloy and MgAl2O4 support exists. As a result, Ni–Fe alloy nanoparticles are highly dispersed on the MgAl2O4 surface. The high CO adsorption ability on the Ni–Fe alloy and synergism catalysis between Ni and Fe result in excellent catalytic activity and high selectivity to ethanol on the bimetallic Ni–Fe alloy. In addition, the strong antisintering ability and stable alloy structure bring about a good catalytic stability. This research proposes a new catalytic system for direct ethanol synthesis from syngas.

Section: Introductionmentioning

confidence: 99%

Highly Dispersed Ni–Fe Alloy Catalysts on MgAl₂O₄ Derived from Hydrotalcite for Direct Ethanol Synthesis from Syngas

Liu

et al. 2020

Energy Tech

“…So far, four types of catalysts have been reported for DES: (a) Rh-based catalysts, , (b) modified methanol synthesis catalysts, (c) modified Fischer–Tropsch catalysts based on Co, , Fe, or Ru; , and (d) modified Mo-based catalysts. , …”

Section: Introductionmentioning

confidence: 99%

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

Zhong

Guo

et al. 2019

Ind. Eng. Chem. Res.

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.

“…Mn is the preferred and commonly employed promoter for Rh-based catalysts. 10,30 The effects of Mn can be summarized as facilitating CO adsorption and dissociation to enhance the reaction rates, and creating interfacial sites for CO insertion to improve the oxygenate selectivities. 2 a However, the promoted mechanism of Mn species is still controversial (Fig.…”

Section: Catalyst Compositionmentioning

confidence: 99%

“…Recently, rapid advances in material design and synthesis methods made it possible to synthesize nanomaterials with a core – shell structure, which is a composite nanomaterial that consists of a metal species as a core and a surrounded material as a shell. 10 The core – shell materials have attracted much attention from researchers because of its highly distinctive functionalities for specific conversions. According to the relative spatial distribution of Rh and supports, Rh-based catalysts can be divided into two types, i.e.…”

Section: Catalysts With Well-designed Structuresmentioning

confidence: 99%

“…Recent observations have found that regulating the location of metal nanoparticles on supports also played an important role in catalytic performance. 10 Success has been achieved by encapsulating/fixing Rh-based nanoparticles within porous materials such as carbon nanotubes 10 a and zeolites, 10 b where the C 2 -oxygenate productivity and catalyst durability are significantly improved compared with the general metal nanoparticles on the external surface of solid supports.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structure-performance interplay of rhodium-based catalysts for syngas conversion to ethanol

Huang

et al. 2022

Mater. Chem. Front.