Effect of phosphorous additive on the surface chromium oxide species on alumina for propane oxidation to propylene

S. J. Khatib; J. L.G. Fierro; M. A. Banares

doi:10.1007/s11244-009-9318-x

Effect of phosphorous additive on the surface chromium oxide species on alumina for propane oxidation to propylene

S. J. Khatib, J. L.G. Fierro, M. A. Banares

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Chromium oxide deposited on phosphorusloaded 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 Cr ₂O₃ during reaction in ca. 170 °C.

Original language	English
Pages (from-to)	1459-1469
Number of pages	11
Journal	Topics in Catalysis
Volume	52
Issue number	10
DOIs	https://doi.org/10.1007/s11244-009-9318-x
State	Published - Sep 2009

Keywords

Alumina
Chromia
Operando
Oxidative dehydrogenation
Phosphorous
Propane
Propylene
Raman

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10.1007/s11244-009-9318-x

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title = "Effect of phosphorous additive on the surface chromium oxide species on alumina for propane oxidation to propylene",

abstract = "Chromium oxide deposited on phosphorusloaded 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 COx, 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 Cr 2O3 during reaction in ca. 170 °C.",

keywords = "Alumina, Chromia, Operando, Oxidative dehydrogenation, Phosphorous, Propane, Propylene, Raman",

author = "Khatib, {S. J.} and Fierro, {J. L.G.} and Banares, {M. A.}",

note = "Funding Information: Acknowledgements This research was funded by the Spanish Ministry Science and Innovation project CTQ2008-04261/PPQ. SJK acknowledges the DGI—Comunidad de Madrid for a PhD fellowship.",

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doi = "10.1007/s11244-009-9318-x",

language = "English",

volume = "52",

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journal = "Topics in Catalysis",

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T1 - Effect of phosphorous additive on the surface chromium oxide species on alumina for propane oxidation to propylene

AU - Khatib, S. J.

AU - Fierro, J. L.G.

AU - Banares, M. A.

N1 - Funding Information: Acknowledgements This research was funded by the Spanish Ministry Science and Innovation project CTQ2008-04261/PPQ. SJK acknowledges the DGI—Comunidad de Madrid for a PhD fellowship.

PY - 2009/9

Y1 - 2009/9

N2 - Chromium oxide deposited on phosphorusloaded 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 COx, 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 Cr 2O3 during reaction in ca. 170 °C.

AB - Chromium oxide deposited on phosphorusloaded 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 COx, 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 Cr 2O3 during reaction in ca. 170 °C.

KW - Alumina

KW - Chromia

KW - Operando

KW - Oxidative dehydrogenation

KW - Phosphorous

KW - Propane

KW - Propylene

KW - Raman

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DO - 10.1007/s11244-009-9318-x

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SP - 1459

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JO - Topics in Catalysis

JF - Topics in Catalysis

IS - 10

ER -

Effect of phosphorous additive on the surface chromium oxide species on alumina for propane oxidation to propylene

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Keywords

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