Oxidative dehydrogenation of n-butane on zinc-chromium ferrite catalysts

H. Armendariz; J. A. Toledo; G. Aguilar-Rios; M. A. Valenzuela; P. Salas; A. Cabral; H. Jimenez; I. Schifter

doi:10.1016/0304-5102(94)00071-9

Oxidative dehydrogenation of n-butane on zinc-chromium ferrite catalysts

H. Armendariz, J. A. Toledo, G. Aguilar-Rios, M. A. Valenzuela, P. Salas, A. Cabral, H. Jimenez, I. Schifter

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

15 Scopus citations

Abstract

The role of chromium as a promoter of butadiene selectivity in n-butane oxidative dehydrogenation on ZnCr_xFe_2-xO₄ (0<x<1.09) catalysts was studied. Catalysts have a spinel structure with Cr³⁺ replacing Fe³⁺ in octahedral sites. Mössbauer spectroscopy studies showed that the substitution of iron by chromium modifies the electron density of the iron nuclei in the ZnFe₂O₄ structure. Iron nuclei showed the lowest electron density for x=0.5-0.6, hence the electron density of oxygen in FeO bond has to be enhanced. n-Butane oxidative dehydrogenation also showed a maximum in butadiene selectivity at x=0.5-0.6. These results suggest that chromium increases butadiene and CO₂ selectivities, with simultaneous decrease of butenes and cracking products explained by an enhancement of the lattice oxygen basicity, which promotes the acid-base type dissociation of the CH bond during butene activation.

Original language	English
Pages (from-to)	325-332
Number of pages	8
Journal	Journal of Molecular Catalysis
Volume	92
Issue number	3
DOIs	https://doi.org/10.1016/0304-5102(94)00071-9
State	Published - 13 Sep 1994
Externally published	Yes

Keywords

Chromium-zinc ferrite
Mössbauer spectroscopy
Oxidative dehydrogenation
X-ray diffraction

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10.1016/0304-5102(94)00071-9

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title = "Oxidative dehydrogenation of n-butane on zinc-chromium ferrite catalysts",

abstract = "The role of chromium as a promoter of butadiene selectivity in n-butane oxidative dehydrogenation on ZnCrxFe2-xO4 (03+ replacing Fe3+ in octahedral sites. M{\"o}ssbauer spectroscopy studies showed that the substitution of iron by chromium modifies the electron density of the iron nuclei in the ZnFe2O4 structure. Iron nuclei showed the lowest electron density for x=0.5-0.6, hence the electron density of oxygen in FeO bond has to be enhanced. n-Butane oxidative dehydrogenation also showed a maximum in butadiene selectivity at x=0.5-0.6. These results suggest that chromium increases butadiene and CO2 selectivities, with simultaneous decrease of butenes and cracking products explained by an enhancement of the lattice oxygen basicity, which promotes the acid-base type dissociation of the CH bond during butene activation.",

keywords = "Chromium-zinc ferrite, M{\"o}ssbauer spectroscopy, Oxidative dehydrogenation, X-ray diffraction",

author = "H. Armendariz and Toledo, {J. A.} and G. Aguilar-Rios and Valenzuela, {M. A.} and P. Salas and A. Cabral and H. Jimenez and I. Schifter",

year = "1994",

month = sep,

day = "13",

doi = "10.1016/0304-5102(94)00071-9",

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volume = "92",

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journal = "Journal of Molecular Catalysis",

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T1 - Oxidative dehydrogenation of n-butane on zinc-chromium ferrite catalysts

AU - Armendariz, H.

AU - Toledo, J. A.

AU - Aguilar-Rios, G.

AU - Valenzuela, M. A.

AU - Salas, P.

AU - Cabral, A.

AU - Jimenez, H.

AU - Schifter, I.

PY - 1994/9/13

Y1 - 1994/9/13

N2 - The role of chromium as a promoter of butadiene selectivity in n-butane oxidative dehydrogenation on ZnCrxFe2-xO4 (03+ replacing Fe3+ in octahedral sites. Mössbauer spectroscopy studies showed that the substitution of iron by chromium modifies the electron density of the iron nuclei in the ZnFe2O4 structure. Iron nuclei showed the lowest electron density for x=0.5-0.6, hence the electron density of oxygen in FeO bond has to be enhanced. n-Butane oxidative dehydrogenation also showed a maximum in butadiene selectivity at x=0.5-0.6. These results suggest that chromium increases butadiene and CO2 selectivities, with simultaneous decrease of butenes and cracking products explained by an enhancement of the lattice oxygen basicity, which promotes the acid-base type dissociation of the CH bond during butene activation.

AB - The role of chromium as a promoter of butadiene selectivity in n-butane oxidative dehydrogenation on ZnCrxFe2-xO4 (03+ replacing Fe3+ in octahedral sites. Mössbauer spectroscopy studies showed that the substitution of iron by chromium modifies the electron density of the iron nuclei in the ZnFe2O4 structure. Iron nuclei showed the lowest electron density for x=0.5-0.6, hence the electron density of oxygen in FeO bond has to be enhanced. n-Butane oxidative dehydrogenation also showed a maximum in butadiene selectivity at x=0.5-0.6. These results suggest that chromium increases butadiene and CO2 selectivities, with simultaneous decrease of butenes and cracking products explained by an enhancement of the lattice oxygen basicity, which promotes the acid-base type dissociation of the CH bond during butene activation.

KW - Chromium-zinc ferrite

KW - Mössbauer spectroscopy

KW - Oxidative dehydrogenation

KW - X-ray diffraction

UR - http://www.scopus.com/inward/record.url?scp=0028499524&partnerID=8YFLogxK

U2 - 10.1016/0304-5102(94)00071-9

DO - 10.1016/0304-5102(94)00071-9

M3 - Artículo

SN - 0304-5102

VL - 92

SP - 325

EP - 332

JO - Journal of Molecular Catalysis

JF - Journal of Molecular Catalysis

IS - 3

ER -

Oxidative dehydrogenation of n-butane on zinc-chromium ferrite catalysts

Abstract

Keywords

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