Study of vanadium based mesoporous silicas for oxidative dehydrogenation of propane and n-butane

Bulánek, Roman; Kalužová, Alena; Setnička, Michal; Zukal, Arnošt; Čičmanec, Pavel; Mayerová, Jana

doi:10.1016/j.cattod.2011.08.044

Cited by 62 publications

(31 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason can be ascribed to the formation of monovanadate species stabilised by the incorporation of V into the support during catalyst preparation. This result confirms the known importance of V site-isolation in improving selectivity for the ODH reaction 2,3,18,24,[54][55][56][57][58] .…”

Section: Acs Paragon Plus Environmentsupporting

confidence: 84%

Spectroscopic Enlightening of the Local Structure Of VO_X Active Sites in Catalysts for the Odh of Propane

et al. 2012

View full text Add to dashboard Cite

Site isolation of V active sites has been often correlated to catalytic performance for the oxidative dehydrogenation (ODH) of propane to propylene. In particular, catalyst selectivity seems favoured by high V dispersion. The latter property is hardly attainable by traditional preparation methods, especially by impregnation except at very low V loading, which however may lead to a too high surface exposure of the acidic sites of the support. In this paper, the effect of the preparation procedure on catalyst properties has been investigated, particularly considering catalysts prepared by flame pyrolysis, a synthesis method which induced a very high V dispersion also at relatively high vanadium loading.Transmission electron microscopy also allowed us to assess V oxide dispersion depending on both the support type and the preparation method. Furthermore, the local structure of the V active sites has been deeply investigated by X-ray Absorption Spectroscopy, allowing us to propose a possible structure of the active sites.The average oxidation state of surface V species was then studied by X-ray Photoelectron Spectroscopy (XPS), showing a role of V oxidation state on catalyst selectivity. The catalytic performance has been interpreted on the basis of V species and catalyst acidity (as measured by IR spectroscopy), another fundamental parameter that in turn results to be correlated with V dispersion on different supports. More selective catalysts were indeed characterized by the presence of weaker Brønsted acidic sites.Keywords: Oxidative dehydrogenation (ODH) of propane; Propylene production; V-based catalysts; X-ray absorption. Page 2 of 53 ACS Paragon Plus EnvironmentThe Journal of Physical Chemistry 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 3 -IntroductionLight olefins are important building blocks for polymers and intermediates industry 1 . The need for light olefins is progressively growing, with a higher rate for propene, leading to the necessity of alternative production routes 2 . Direct dehydrogenation can be an interesting alternative when low value feedstock is available. However, it is an endothermal reaction needing a high energy input, it is equilibrium controlled and the catalyst may be easily deactivated by coking. The oxidative dehydrogenation (ODH) of light paraffins to the corresponding olefins has been proposed as a means to overcome all these limitations. In addition, oxygen limits severe catalyst coking 3 . In spite of the considerable attention paid to this process and testified by a certain number of patents (see e.g. 4,5 and references therein), the ODH technology can be hardly considered mature and it has not yet reached industrial application due to selectivity issues. Indeed, oxygen should ideally consume H 2 , but paraffins and (most of all) olefins combustion is an unavoidable side reaction, w...

show abstract

Section: Acs Paragon Plus Environmentsupporting

confidence: 84%

Spectroscopic Enlightening of the Local Structure Of VO_X Active Sites in Catalysts for the Odh of Propane

et al. 2012

View full text Add to dashboard Cite

show abstract

“…propane [14]. High stability of the catalyst is caused by the high selectivity of VO X active species and also due to burning of potential coke deposits by oxygen in the stream.…”

Section: Trans-2-butene (C-c 4 and T-cmentioning

confidence: 99%

“…Supported vanadium-based catalysts belong to the best performing materials in the ODH of alkanes and they were widely investigated in different types of reactions [13][14][15][16][17][18].…”

mentioning

confidence: 99%

Combined Oxidative and Non-oxidative Dehydrogenation of n-Butane Over VOX Species Supported on HMS

et al. 2013

View full text Add to dashboard Cite

show abstract

“…In general, homogeneous combustion can be desirable or detrimental, depending on the specific application and conditions of the system [15]. On the one hand, homogeneous chemistry have positive impact, for example, moderation of the superadiabatic wall temperatures [9], feasibility of operating at higher velocities [16], extension of blow-out and extinction limits [17], and making chemicals in oxidative coupling and oxidative dehydrogenation reactions [18,19]; in these cases, HH reactors are designed to appropriately promote homogeneous combustion. On the other hand, the homogeneous chemistry is an undesired feature because its onset results in flames associated with uncontrolled process temperatures, with severe implications for safety, reactor runaway, device failure, catalyst lifetime, or even explosive behavior; higher reactor temperatures in the presence of homogeneous combustion have been observed experimentally [12] and numerically [20].…”

Section: Introductionmentioning

confidence: 99%

Effects of heterogeneous–homogeneous interaction on the homogeneous ignition in hydrogen-fueled catalytic microreactors

Chen

Liu

Gao

et al. 2016

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Study of vanadium based mesoporous silicas for oxidative dehydrogenation of propane and n-butane

Cited by 62 publications

References 75 publications

Spectroscopic Enlightening of the Local Structure Of VO_X Active Sites in Catalysts for the Odh of Propane

Spectroscopic Enlightening of the Local Structure Of VO_X Active Sites in Catalysts for the Odh of Propane

Combined Oxidative and Non-oxidative Dehydrogenation of n-Butane Over VOX Species Supported on HMS

Effects of heterogeneous–homogeneous interaction on the homogeneous ignition in hydrogen-fueled catalytic microreactors

Contact Info

Product

Resources

About

Study of vanadium based mesoporous silicas for oxidative dehydrogenation of propane and n-butane

Cited by 62 publications

References 75 publications

Spectroscopic Enlightening of the Local Structure Of VOX Active Sites in Catalysts for the Odh of Propane

Spectroscopic Enlightening of the Local Structure Of VOX Active Sites in Catalysts for the Odh of Propane

Combined Oxidative and Non-oxidative Dehydrogenation of n-Butane Over VOX Species Supported on HMS

Effects of heterogeneous–homogeneous interaction on the homogeneous ignition in hydrogen-fueled catalytic microreactors

Contact Info

Product

Resources

About

Spectroscopic Enlightening of the Local Structure Of VO_X Active Sites in Catalysts for the Odh of Propane

Spectroscopic Enlightening of the Local Structure Of VO_X Active Sites in Catalysts for the Odh of Propane