Promotion effect of support calcination on ethanol production from CO hydrogenation over Rh/Fe/Al2O3 catalysts

Chen, Weimiao; Ding, Yunjie; Song, Xiaoyan; Wang, Tao; Luo, Hong-Yuan

doi:10.1016/j.apcata.2011.08.044

Cited by 40 publications

(13 citation statements)

References 41 publications

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“…In order to reduce the consumption of Rh and maximize the catalytic efficiency over the catalyst, various electronic promoters, such as Li (Schwartz et al, 2011), V (Gao et al, 2009a;Gao et al, 2009b), La (Subramanian et al, 2010), Fe (Chen et al, 2011), and Mn (Yin et al, 2003) were investigated. Previous studies have demonstrated that the performance of Rh catalysts could be enhanced significantly with the modification of MnO x .…”

Section: Introductionmentioning

confidence: 99%

A mechanistic basis for the effects of Mn loading on C2+ oxygenates synthesis directly from syngas over Rh–MnO /SiO2 catalysts

Mao

Zhang

et al. 2015

Chemical Engineering Science

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Kinetics of the synthesis of C 2+ oxygenates directly from syngas was investigated over a series of Rh-MnO x /SiO 2 catalysts (atomic ratio of Mn/Rh = 0, 0.5 and 5.0). It was evidenced that the activation energies for C 2+ oxygenates changed little when introducing MnO x , while the apparent activation energies for hydrocarbons, especially methane, increased remarkably. Kinetic parameters indicate that the formation of hydrocarbons can be suppressed in the presence of MnO x. In the meantime, the reaction orders with respect to different products were also altered with the variation of MnO x loadings. In accordance with in situ DRIFTS, we found that two new active sites on Rh surfaces resulting from the Rh-MnO x interaction might be responsible for the enhancement of reaction rates and the selectivity to C 2+ oxygenates. However, the overloading of MnO x leads to a decrease in the number of active sites.

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Section: Introductionmentioning

confidence: 99%

A mechanistic basis for the effects of Mn loading on C2+ oxygenates synthesis directly from syngas over Rh–MnO /SiO2 catalysts

Mao

Zhang

et al. 2015

Chemical Engineering Science

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“…This would negate the need to carry out multiple catalyst test cycles. As Al2O3 is hygroscopic, it was hypothesised that the removal of surface water species and carbonates (the C 1s region of the XPS spectra showed peak at 289.7 eV, that is indicative of O-C=O, carbonate species) could enhance the dispersion of Pd, as these species may block the pore structure of the support [71,72]. Therefore, the alumina support was calcined under flowing air at 600 °C at 10 °C min -1 for 4 h before metal deposition (denoted as SC) and a 2.6 wt.…”

Section: Resultsmentioning

confidence: 99%

Structure-sensitivity of alumina supported palladium catalysts for N2O decomposition

Richards

Carter

Nowicka

et al. 2020

Applied Catalysis B: Environmental

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The catalytic activity of Pd/γAl2O3 for N2O decomposition was found to be highly dependent on the preparation methodology and the number of reaction cycles. Chloride species on the surface of a 2.6 wt. % Pd-Al2O3 catalyst prepared by wet impregnation were identified as inhibiting the activity. Multiple reaction cycles were shown to remove these species, and a subsequent increase in activity was observed; 10.3 molN2O h-1 kgcat-1 in the first use, increased to 28.7 molN2O h-1 kgcat-1 on the fourth use both at 550 °C. Additionally, removal of physisorbed water from the support prior to metal deposition increased the thermal stability of Pd nanoparticles and increased the catalyst activity. Catalysts were subsequently prepared using a deposition technique with an increased concentration of Clions resulted in increased Pd-Cl species in the final catalyst and the catalytic activity was consequently increased due to the improved control of Pd particle size.

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“…The support is also an important parameter for the design of catalysts due to its influence on metal dispersion, metal-support interaction [7]. SiO 2 [8], g-Al 2 O 3 [9], TiO 2 [10], SBA-15 [11], and carbon nanotubes [12] had been used as carriers. However, to date, only the SiO 2 -supported Rh system has been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Ethanol synthesis from syngas on Mn- and Fe-promoted Rh/γ-Al2O3

Zhang

et al. 2014

Comptes Rendus. Chimie

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Promotion effect of support calcination on ethanol production from CO hydrogenation over Rh/Fe/Al2O3 catalysts

Cited by 40 publications

References 41 publications

A mechanistic basis for the effects of Mn loading on C2+ oxygenates synthesis directly from syngas over Rh–MnO /SiO2 catalysts

A mechanistic basis for the effects of Mn loading on C2+ oxygenates synthesis directly from syngas over Rh–MnO /SiO2 catalysts

Structure-sensitivity of alumina supported palladium catalysts for N2O decomposition

Ethanol synthesis from syngas on Mn- and Fe-promoted Rh/γ-Al2O3

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