Oxydehydrogenation of propane over Mg-V-Sb-oxide catalysts. I. Reaction network View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1996-09

AUTHORS

James N. Michaels, David L. Stern, Robert K. Grasselli

ABSTRACT

Magnesium vanadates have been shown by various groups to be active oxydehydrogenation catalysts for the conversion of light paraffins to the corresponding olefins. The olefins produced have significant commercial value in petroleum and petrochemical industry. Recently, we reported that doping of the magnesium vanadates with antimony, antimony-phosphorus, or boron, produces catalysts with significantly better selectivities to olefins than those of the parent undoped catalysts. Among these, the composition Mg4V2SbOx was selected for further study of propane oxydehydrogenation and its reaction network. At 500°C and atmospheric pressure, the selectivity to propylene decreases monotonically from 75% to 5% as propane conversion is increased from 2% to 68%. An analysis of the reaction network reveals, that propylene is the only useful first formed product, that COx is produced largely by sequential oxidation of the in situ formed propylene, but also to a lesser extent direct from propane by a deep oxidation route. The presence of two parallel pathways for COx formation is of interest, as it suggests that partial and deep oxidations may occur at different surface sites or involve different forms of reactive oxygens. Both of these might be amenable to electronic modification by substitution or doping to achieve higher propylene selectivities and yields at higher propane conversions, or their catalytic behavior might be advantageously alterable through site isolation of the paraffin activation centers. More... »

PAGES

135-137

References to SciGraph publications

Journal

TITLE

Catalysis Letters

ISSUE

3-4

VOLUME

42

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00810678

DOI

http://dx.doi.org/10.1007/bf00810678

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1033121849


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