Molecular structure and reactivity of vanadia-based catalysts for propane oxidative dehydrogenation studied by in situ Raman spectroscopy and catalytic activity measurements

Christodoulakis, Antonios; Machli, Maria; Lemonidou, Angeliki A.; Boghosian, Soghomon

doi:10.1016/j.jcat.2003.10.007

Cited by 153 publications

(82 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed the half-field feature is consistent with the presence of lower oxidation state V species such as V 3+ [39]. Vanadia based catalysts are well known to undergo reduction during dehydrogenation and oxidative dehydrogenation reactions [5,9,40]. That reduced species are present after n-butane dehydrogenation over the catalyst employed in the present work is supported by in situ XPS and NEXAFS studies which show the average oxidation state of vanadium to be 3.5+ [7,41].…”

Section: Characterisation Of Vo X /Al 2 O 3 Post-reactionsupporting

confidence: 80%

See 1 more Smart Citation

Active coke: Carbonaceous materials as catalysts for alkane dehydrogenation

McGregor

Huang

Parrott

et al. 2010

Journal of Catalysis

View full text Add to dashboard Cite

The catalytic dehydrogenation (DH) and oxidative dehydrogenation (ODH) of light alkanes are of significant industrial importance. In this work both carbonaceous material deposited on VOx/Al2O3 catalysts during reaction and unsupported carbon nanofibres (CNFs) are shown to be active for the dehydrogenation of butane in the absence of gas-phase oxygen. Their activity in these reactions is shown to be dependent upon their structure, with different reaction temperatures yielding structurally different coke deposits. Terahertz time-domain spectroscopy (THz-TDS), among other techniques, has been applied to the characterisation of these deposits -the first time this technique has been employed in coke studies. TEM and other techniques show that coke encapsulates the catalyst, preventing access to VOx sites, without a loss of activity. Studies on CNFs confirm that carbonaceous materials act as catalysts in this reaction. Carbon-based catalysts represent an important new class of potential catalysts for DH and ODH reactions.

show abstract

Section: Characterisation Of Vo X /Al 2 O 3 Post-reactionsupporting

confidence: 80%

“…Recent research in this area has focused on butane DH over alumina-supported vanadia catalysts [2][3][4][5][6][7][8]. Additionally, the oxidative dehydrogenation (ODH) of light alkanes also receives significant academic attention [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Active coke: Carbonaceous materials as catalysts for alkane dehydrogenation

McGregor

Huang

Parrott

et al. 2010

Journal of Catalysis

View full text Add to dashboard Cite

show abstract

“…, the Raman band at 1024 cm −1 , which could be attributed to the terminal V=O bond of surface highly dispersed vanadium species was detected in all samples , . No sharp signals at about 990 and 485 cm −1 were identified in any of the samples, which demonstrated that bulk‐V 2 O 5 was not formed , . The small shoulder at 990 cm −1 belonged to the V‐O‐V bond in polymeric or microcrystalline vanadium species, which suggested that a small amount of polymeric vanadium species existed on samples with a high metal loading (4V‐ and 5V‐MCM‐41) , .…”

Section: Resultsmentioning

confidence: 87%

Synthesis of V‐MCM‐41 Catalysts and Their Application in CO₂‐Assisted Isobutane Dehydrogenation

Wang

Zhou

et al. 2018

Chem Eng & Technol

View full text Add to dashboard Cite

A series of V-MCM-41 were in situ synthesized. The textual properties and vanadium species were systematically characterized. The results showed that the catalysts could still maintain a mesoporous structure and high specific surface area. The vanadium species were highly dispersed on the surface, with the coexistence of polymeric vanadium species. Isobutane dehydrogenation was performed by employing CO 2 as a soft oxidant. The results revealed an almost linear relationship between the activity and surface vanadium sites. Isolated vanadium species were more active for isobutane dehydrogenation. The isobutane dehydrogenation reaction in the presence of CO 2 could proceed simultaneously through oxidative dehydrogenation and non-oxidative dehydrogenation followed by the reverse water gas shift reaction.

show abstract

“…Supported metal oxide‐based catalysts have been widely studied for alkane ODH reactions with the aim of enhancing the conversion‐selectivity relationship. Among them, vanadium and molybdenum‐oxide based catalysts have been effectively applied for the propane ODH reaction 6–29. Much research has focused on understanding these supported metal oxide catalysts by correlating the catalytic activity with spectroscopic information 5–11.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, vanadium and molybdenum‐oxide based catalysts have been effectively applied for the propane ODH reaction 6–29. Much research has focused on understanding these supported metal oxide catalysts by correlating the catalytic activity with spectroscopic information 5–11. Specifically, the catalytic performance of V 2 O 5 /Al 2 O 3 and MoO 3 /Al 2 O 3 catalysts have been tested for propane ODH reaction to study the effect of metal oxide loading and modifiers 12–22.…”

Section: Introductionmentioning

confidence: 99%

Kinetic parameter analysis for propane ODH: V₂O₅/Al₂O₃ and MoO₃/Al₂O₃ catalysts

Rao

Deo

2007

AIChE Journal

View full text Add to dashboard Cite

in Wiley InterScience (www.interscience.wiley.com).The effect of surface metal oxide loading and specific surface metal oxide species on the kinetic parameters associated with the propane oxidative dehydrogenation reaction is analyzed for several supported V 2 O 5 /Al 2 O 3 (VAl) and MoO 3 /Al 2 O 3 (MoAl) catalysts. The VAl and MoAl catalysts are synthesized and characterized to ensure the kinetic parameters are estimated primarily for the surface metal oxide phase. The kinetic parameters are successfully estimated for a consecutive Mars-van Krevelen reaction model. Analysis of the parameters reveals that the apparent pre-exponential factors for propene formation and degradation reactions increase with loading for both VAl and MoAl catalysts up to monolayer coverage with the VAl possessing larger values. However, the relative increase of the individual apparent pre-exponential factors is different. The activation energy for propene formation is relatively invariant and does not contribute to the activity comparison. The difference in activation energies for propene formation and degradation decreases with surface vanadia loading, but is relatively similar with surface molybdena loading. Detailed analysis of the kinetic parameters conclusively reveals that the surface vanadia species provides a better active site in terms of activity and propene yield for the propane ODH reaction.

show abstract

Molecular structure and reactivity of vanadia-based catalysts for propane oxidative dehydrogenation studied by in situ Raman spectroscopy and catalytic activity measurements

Cited by 153 publications

References 52 publications

Active coke: Carbonaceous materials as catalysts for alkane dehydrogenation

Active coke: Carbonaceous materials as catalysts for alkane dehydrogenation

Synthesis of V‐MCM‐41 Catalysts and Their Application in CO₂‐Assisted Isobutane Dehydrogenation

Kinetic parameter analysis for propane ODH: V₂O₅/Al₂O₃ and MoO₃/Al₂O₃ catalysts

Contact Info

Product

Resources

About

Molecular structure and reactivity of vanadia-based catalysts for propane oxidative dehydrogenation studied by in situ Raman spectroscopy and catalytic activity measurements

Cited by 153 publications

References 52 publications

Active coke: Carbonaceous materials as catalysts for alkane dehydrogenation

Active coke: Carbonaceous materials as catalysts for alkane dehydrogenation

Synthesis of V‐MCM‐41 Catalysts and Their Application in CO2‐Assisted Isobutane Dehydrogenation

Kinetic parameter analysis for propane ODH: V2O5/Al2O3 and MoO3/Al2O3 catalysts

Contact Info

Product

Resources

About

Synthesis of V‐MCM‐41 Catalysts and Their Application in CO₂‐Assisted Isobutane Dehydrogenation

Kinetic parameter analysis for propane ODH: V₂O₅/Al₂O₃ and MoO₃/Al₂O₃ catalysts