Oxidative dehydrogenation of propane over vanadium and niobium oxides supported catalysts

Viparelli, Paolo; Ciambelli, Paolo; Lisi, L.; Ruoppolo, Giovanna; Russo, G.; Volta, J.C.

doi:10.1016/s0926-860x(99)00104-0

Cited by 59 publications

(18 citation statements)

References 24 publications

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“…The conversion/selectivity data reported in Figure 9 are comparable with those reported by Viparelli et al [35], who used 6% Nb or 1% V + 6% Nb over TiO 2 . A bulk V 2 O 5 catalyst has been tested by Garcìa et al [36], obtaining as expected very limited selectivity to propene (max.…”

Section: Resultssupporting

confidence: 88%

Structured Monolithic Catalysts vs. Fixed Bed for the Oxidative Dehydrogenation of Propane

et al. 2019

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The deposition of V-based catalysts for the oxidative dehydrogenation of propane to propene on cordierite honeycomb monoliths was optimised as a strategy to decrease the contact time in a structured reactor with respect to a conventional fixed bed one. 10 wt% VOx supported over SiO2 or Al2O3 were used as catalysts, deposed over the monolith using silica or alumina as primer, respectively. Both the alumina supported catalyst and the bohemite primer precursor were effectively deposed by dip-coating from stable powder suspensions, whereas insufficient adhesion was obtained when loading pre-synthesised SiO2 over the cordierite. A new method based on sol-gel production of SiO2 from tetraethylortosilicate (TEOS) over the monolith surface was set up. A correlation was derived for the prevision of the amount of silica deposed depending on the amount of TEOS. Both primer and catalyst loading were optimised as for uniformity and stability of the coating and resulted 0.5–1 wt % primer and 0.15 wt % of catalyst. Activity testing confirmed the strong improvement of propene productivity by increasing the time factor (i.e. Ncm3 of flowing reactant/min gcat), which ended in a one order of magnitude increase of productivity for the honeycomb-supported samples with respect to the fixed bed configuration.

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Section: Resultssupporting

confidence: 88%

Structured Monolithic Catalysts vs. Fixed Bed for the Oxidative Dehydrogenation of Propane

et al. 2019

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“…In contrast, this result does not hold true in the case of propene. Nevertheless, the oxidative dehydrogenation of propane is possible,22 but the yields of propene are low because the allylic structure that is formed upon further hydrogen abstraction from propene favors further oxidation,6 thus leading to oxygenated by‐products and, eventually, CO x 23…”

Section: Oxidative Dehydrogenation Of Ethane: Mechanistic Considermentioning

confidence: 99%

Oxidative Dehydrogenation of Ethane: Common Principles and Mechanistic Aspects

2013

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The steam cracking of hydrocarbons is the most widespread process for the industrial manufacture of ethene. Steam-diluted alkanes are converted at high temperatures (approximately 800 8C) in reactor tubes, thus leading to homogeneous pyrolysis. A wide variety of feeds with boiling points of up to 600 8C can be converted through a radical chain mechanism. Having been practiced for over 50 years, this process is now very [a] Dipl.-Ing.

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“…For alumina supported catalysts [47] the selectivity also approached 100% selectivity at low conversions. In a kinetic study Viparelli et al [48] considered the rate constant k 2 , which describes the rate of the parallel propane combustion (scheme 1) to be zero for a titania supported vanadia catalyst. In contrast, zirconia supported catalysts show poor selectivities even at very low conversions.…”

Section: Reaction Networkmentioning

confidence: 99%

Oxidative dehydrogenation of propane over low-loaded vanadia catalysts: Impact of the support material on kinetics and selectivity

Dinse

Frank

Heß

et al. 2008

Journal of Molecular Catalysis A: Chemical

112

113

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The influence of the support material of low loaded (< 2 V nm -²) vanadia catalysts on selectivities, activation energies and turn over frequencies in the oxidative dehydrogenation of propane and the combustion of propene was investigated. CeO 2 , TiO 2 , Al 2 O 3 , ZrO 2 and SiO 2 supported catalysts were prepared by saturation wetness impregnation in toluene. Characterization with temperature programmed reduction and Raman spectroscopy revealed a high dispersion of surface vanadia species for all investigated catalysts. The impact of heat and mass transfer limitations on the catalytic performance has been thoroughly excluded. Selectivities towards propene as well as activation energies strongly depend on the support material. For all catalysts, propene selectivity increases with temperature. Deconvolution of the reaction network of ODP into decoupled reactions of different reactants for at least three of the catalysts is not possible, because of a significant impact of the oxidation state of the catalyst on the reaction. Except for the CeO 2 supported catalyst, the contribution of the bare support material on the activity can be neglected.

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Oxidative dehydrogenation of propane over vanadium and niobium oxides supported catalysts

Cited by 59 publications

References 24 publications

Structured Monolithic Catalysts vs. Fixed Bed for the Oxidative Dehydrogenation of Propane

Structured Monolithic Catalysts vs. Fixed Bed for the Oxidative Dehydrogenation of Propane

Oxidative Dehydrogenation of Ethane: Common Principles and Mechanistic Aspects

Oxidative dehydrogenation of propane over low-loaded vanadia catalysts: Impact of the support material on kinetics and selectivity

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