Characterization of Sr2+/La2O3 catalyst modified with different cobalt content

S. L. González-Cortés; J. Orozco; J. L. Brito; B. Fontal

Characterization of Sr²⁺/La₂O₃ catalyst modified with different cobalt content

S. L. González-Cortés
, J. Orozco
, J. L. Brito
, B. Fontal

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

1 Scopus citations

Abstract

Cobalt oxide content and calcination temperature effects on the Sr²⁺/La₂O₃ catalyst structure were studied. The Co/Sr - La catalysts were prepared by successive immersion impregnation and characterized by XRD, FTIR, TGA, surface area (B.E.T.) and TPR. The Sr²⁺/La₂O₃ catalysts with low cobalt composition show a strong interaction of Co with the intrinsic La₂O₃ surface defects probably leading to formation of a brownmillerite superstructure, oxygen deficient (LaCoO_3-λ), enriched with Co²⁺ ions. Cobalt contents higher than 2% gave local or island La_1-xSr_xCoO₃ solid solutions and further cobalt addition favors mixed La - Co perovskite-type oxide and cobalt oxide formation. The mixed La - Co oxide is the predominant product when Sr²⁺ is present as an additive. Higher calcination temperatures favor the mixed oxide formation in all the Co composition.

Original language	English
Pages (from-to)	253-261
Number of pages	9
Journal	Acta Cientifica Venezolana
Volume	49
Issue number	4
State	Published - 1998
Externally published	Yes

Keywords

Catalyst
Characterization
Perovskite

Cite this

@article{86f90493797442eab2667bb99db0d13d,

title = "Characterization of Sr2+/La2O3 catalyst modified with different cobalt content",

abstract = "Cobalt oxide content and calcination temperature effects on the Sr2+/La2O3 catalyst structure were studied. The Co/Sr - La catalysts were prepared by successive immersion impregnation and characterized by XRD, FTIR, TGA, surface area (B.E.T.) and TPR. The Sr2+/La2O3 catalysts with low cobalt composition show a strong interaction of Co with the intrinsic La2O3 surface defects probably leading to formation of a brownmillerite superstructure, oxygen deficient (LaCoO3-λ), enriched with Co2+ ions. Cobalt contents higher than 2\% gave local or island La1-xSrxCoO3 solid solutions and further cobalt addition favors mixed La - Co perovskite-type oxide and cobalt oxide formation. The mixed La - Co oxide is the predominant product when Sr2+ is present as an additive. Higher calcination temperatures favor the mixed oxide formation in all the Co composition.",

keywords = "Catalyst, Characterization, Perovskite",

author = "Gonz{\'a}lez-Cort{\'e}s, \{S. L.\} and J. Orozco and Brito, \{J. L.\} and B. Fontal",

year = "1998",

language = "Ingl{\'e}s",

volume = "49",

pages = "253--261",

journal = "Acta Cientifica Venezolana",

issn = "0001-5504",

publisher = "Edificio FundaVAC - AsoVAC",

number = "4",

}

TY - JOUR

T1 - Characterization of Sr2+/La2O3 catalyst modified with different cobalt content

AU - González-Cortés, S. L.

AU - Orozco, J.

AU - Brito, J. L.

AU - Fontal, B.

PY - 1998

Y1 - 1998

N2 - Cobalt oxide content and calcination temperature effects on the Sr2+/La2O3 catalyst structure were studied. The Co/Sr - La catalysts were prepared by successive immersion impregnation and characterized by XRD, FTIR, TGA, surface area (B.E.T.) and TPR. The Sr2+/La2O3 catalysts with low cobalt composition show a strong interaction of Co with the intrinsic La2O3 surface defects probably leading to formation of a brownmillerite superstructure, oxygen deficient (LaCoO3-λ), enriched with Co2+ ions. Cobalt contents higher than 2% gave local or island La1-xSrxCoO3 solid solutions and further cobalt addition favors mixed La - Co perovskite-type oxide and cobalt oxide formation. The mixed La - Co oxide is the predominant product when Sr2+ is present as an additive. Higher calcination temperatures favor the mixed oxide formation in all the Co composition.

AB - Cobalt oxide content and calcination temperature effects on the Sr2+/La2O3 catalyst structure were studied. The Co/Sr - La catalysts were prepared by successive immersion impregnation and characterized by XRD, FTIR, TGA, surface area (B.E.T.) and TPR. The Sr2+/La2O3 catalysts with low cobalt composition show a strong interaction of Co with the intrinsic La2O3 surface defects probably leading to formation of a brownmillerite superstructure, oxygen deficient (LaCoO3-λ), enriched with Co2+ ions. Cobalt contents higher than 2% gave local or island La1-xSrxCoO3 solid solutions and further cobalt addition favors mixed La - Co perovskite-type oxide and cobalt oxide formation. The mixed La - Co oxide is the predominant product when Sr2+ is present as an additive. Higher calcination temperatures favor the mixed oxide formation in all the Co composition.

KW - Catalyst

KW - Characterization

KW - Perovskite

UR - https://www.scopus.com/pages/publications/0039010097

M3 - Artículo

AN - SCOPUS:0039010097

SN - 0001-5504

VL - 49

SP - 253

EP - 261

JO - Acta Cientifica Venezolana

JF - Acta Cientifica Venezolana

IS - 4

ER -

Characterization of Sr²⁺/La₂O₃ catalyst modified with different cobalt content

Abstract

Keywords

Other files and links

Fingerprint

Cite this