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8479440 
Journal Article 
Effect of Phosphorous Additive on the Surface Chromium Oxide Species on Alumina for Propane Oxidation to Propylene 
Khatib, SJ; Fierro, JLG; Banares, MA; , 
2009 
1 
Topics in Catalysis
ISSN: 1022-5528
EISSN: 1572-9028 
SPRINGER/PLENUM PUBLISHERS 
NEW YORK 
1459-1469 
WOS:000268103900018 
Chromium oxide deposited on phosphorus-loaded alumina is used in the oxidative dehydrogenation (ODH) of propane to propylene. Operando Raman-GC studies allowed evaluating the molecular structure of surface Cr oxide species, their reactivity and their changes undergone during operation. The addition of phosphorous to the alumina substrate decreases propane conversion, mainly due to the decrease of CO (x) , there is a concomitant increase in the selectivity to propylene formation. The addition of phosphorous affects the nature of the Cr oxide species, which do not form of a new phase. The surface interaction between dispersed chromate species and phosphorous weakens the Cr=O bond and retards the aggregation of surface chromate species as Cr2O3 during reaction in ca. 170 A degrees C.