Mechanistic insights into the formation of acetaldehyde and diethyl ether from ethanol over supported VOx, MoOx, and WOx catalysts

Nair, Hari; Gatt, Joseph E.; Miller, Jeffrey T.; Baertsch, Chelsey D.

doi:10.1016/j.jcat.2011.01.011

Cited by 56 publications

(47 citation statements)

References 53 publications

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“…Acetaldehyde is also produced by dehydrogenation of ethanol as a side reaction. As seen from the figure, increased temperature resulted in a slight decrease in selectivity of acetaldehyde, which was also reported by Nair et al [22].…”

Section: Ethanol Dehydration Reactionsupporting

confidence: 87%

Effect of Mo-Doped Mesoporous Al-SSP Catalysts for the Catalytic Dehydration of Ethanol to Ethylene

Chanchuey

Autthanit

Jongsomjit

2016

Journal of Chemistry

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The catalytic dehydration of ethanol to ethylene over the mesoporous Al-SSP and Mo-doped Al-SSP catalysts was investigated. The Al-SSP catalyst was first synthesized by the modified sol-gel method and then doped with Mo by impregnation to obtain 1% Mo/Al-SSP and 5% Mo/Al-SSP catalysts (1 and 5 wt% of Mo). The final catalysts were characterized using various techniques such as XRD, N2physisorption, SEM/EDX, TEM, and NH3-TPD. The catalytic activity for all catalysts in gas-phase ethanol dehydration reaction was determined at temperature range of 200°C to 400°C. It was found that the most crucial factor influencing the catalytic activities appears to be the acidity. The acid property of catalysts depended on the amount of Mo loading. Increased Mo loading in Al-SSP resulted in increased weak acid sites, which enhanced the catalytic activity. Besides acidity, the high concentration of Al at surface of catalyst is also essential to obtain high activity. Based on the results, the most suitable catalyst in this study is 1% Mo/Al-SSP catalyst, which can produce ethylene yield of ca. 90% at 300°C with slight amounts of diethyl ether (DEE) and acetaldehyde.

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Section: Ethanol Dehydration Reactionsupporting

confidence: 87%

Effect of Mo-Doped Mesoporous Al-SSP Catalysts for the Catalytic Dehydration of Ethanol to Ethylene

Chanchuey

Autthanit

Jongsomjit

2016

Journal of Chemistry

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“…7 . This is likely due to reoxidization on the catalyst surface by oxygen from the feed 19 . Consequently, the catalytic activity of all Mg-Al catalysts was determined via oxidative dehydrogenation of ethanol at the reaction temperature from 200-400 .…”

Section: Reaction Studymentioning

confidence: 99%

Effect of Calcination Temperature on Mg-Al Layered Double Hydroxides (LDH) as Promising Catalysts in Oxidative Dehydrogenation of Ethanol to Acetaldehyde

2019

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“…Different studies in the open literature report conflicting kinetic dependencies on the size distribution of supported VO x . For instance, for the case of alumina‐supported vanadia, a positive correlation between the turnover frequency (TOF) and the size of the VO x cluster for ethanol partial oxidation within the sub‐monolayer region has been reported whereas another reported nearly constant turnover frequency for ethanol partial oxidation over VO x clusters with different sizes anchored on alumina . There is even less research reporting a correlation between the TOF for ethanol partial oxidation and VO x average cluster size over titania.…”

Section: Introductionmentioning

confidence: 99%

Supported Vanadium Oxide Clusters in Partial Oxidation Processes: Catalytic Consequences of Size and Electronic Structure

2017

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The catalytic activity for ethanol partial oxidation of vanadium oxide (VOx) anchored on titanium oxide was correlated to their electronic structure. In situ Raman spectroscopy and temperature‐programmed desorption (TPD) experiments indicate that the presence of catalytically active VOx moieties is very sensitive to vanadia loading: highly dispersed VOx predominantly exists at low VOx contents whereas larger vanadia clusters coexist at higher VOx loadings. In situ UV/Vis spectroscopy revealed that a significant fraction of these larger clusters remain reduced during catalysis, and thus do not fully participate in catalytic turnovers. The electronic structures of model VOx nanoclusters of different sizes (monomer, dimer, trimer, and one‐dimensional polymers) were investigated by using periodic density functional theoretical calculations. Results indicate that their electronic structures are significantly affected by their size. Our analysis also revealed that the formation of reduced VOx species (V4+) during catalysis is concomitant to the reduction of adjacent Ti cations (Ti3+). Theoretically calculated optical absorption spectra matched the experimental spectroscopic results obtained under in situ reaction conditions. Furthermore, the determination of defect formation enthalpies reported previously as the main descriptor for catalytic activity of vanadia nanoclusters, predicted that isolated monomeric VOx clusters predominantly take part in catalytic turnovers.

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Mechanistic insights into the formation of acetaldehyde and diethyl ether from ethanol over supported VOx, MoOx, and WOx catalysts

Cited by 56 publications

References 53 publications

Effect of Mo-Doped Mesoporous Al-SSP Catalysts for the Catalytic Dehydration of Ethanol to Ethylene

Effect of Mo-Doped Mesoporous Al-SSP Catalysts for the Catalytic Dehydration of Ethanol to Ethylene

Effect of Calcination Temperature on Mg-Al Layered Double Hydroxides (LDH) as Promising Catalysts in Oxidative Dehydrogenation of Ethanol to Acetaldehyde

Supported Vanadium Oxide Clusters in Partial Oxidation Processes: Catalytic Consequences of Size and Electronic Structure

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