Sol-gel precursors and the oxygen storage capacity of PrOy-ZrO2 materials

C. K. Narula; K. L. Taylor; L. P. Haack; L. F. Allard; A. Datye; M. Yu Sinev; M. Shelef; R. W. McCabe; W. Chun; G. W. Graham

Sol-gel precursors and the oxygen storage capacity of PrO_y-ZrO₂ materials

C. K. Narula, K. L. Taylor, L. P. Haack, L. F. Allard, A. Datye, M. Yu Sinev, M. Shelef, R. W. McCabe, W. Chun, G. W. Graham

Research output: Contribution to journal › Conference article › peer-review

3 Scopus citations

Abstract

The gels derived from mixtures of Pr(OⁱC₃H₇)₃ and Zr(OⁱC₃H₇)₄·ⁱC₃H₇OH, upon hydrolysis and pyrolysis, furnish single-phase PrO_y-ZrO₂ materials crystallized in the fluorite structure. These materials can be coated onto high-surface-area γ-alumina powders or deposited onto dense α-alumina coupons in the form of thin films from a solution of parent alkoxides modified with 2,4-pentanedione in THF. The fluorite structure of the PrO_y-ZrO₂ in the films appears to be thermally stable in air up to 1200°C. Temperature-programmed-reduction (TPR) measurements show that the bulk PrO_y-ZrO₂ material with a Pr:Zr molar ratio of 1:1 can store and release oxygen while that with a molar ratio of 1:3 cannot. The precursors play an important role in determining phase composition of the resulting PrO_y-ZrO₂ material. A mixture of monoclinic and cubic or tetragonal phases was found in PrO_y-ZrO₂ prepared from a new single-source heterometallic alkoxide, Pr₂Zr₆(μ₄-O)₂(μ-OAc)₆ (μ-OⁱPr)₁₀(OⁱPr)₁₀, whereas a mixture of cubic and tetragonal phases was present in PrO_y-ZrO₂ made previously by coprecipitation from aqueous solutions of the metal nitrates.

Original language	English
Pages (from-to)	15-20
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	497
State	Published - 1998
Externally published	Yes
Event	Proceedings of the 1997 MRS Fall Symposium - Boston, MA, USA Duration: Dec 1 1997 → Dec 2 1997

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@article{962944608a9f4275b04a4aee9da0b9fa,

title = "Sol-gel precursors and the oxygen storage capacity of PrOy-ZrO2 materials",

abstract = "The gels derived from mixtures of Pr(OiC3H7)3 and Zr(OiC3H7)4·iC3H7OH, upon hydrolysis and pyrolysis, furnish single-phase PrOy-ZrO2 materials crystallized in the fluorite structure. These materials can be coated onto high-surface-area γ-alumina powders or deposited onto dense α-alumina coupons in the form of thin films from a solution of parent alkoxides modified with 2,4-pentanedione in THF. The fluorite structure of the PrOy-ZrO2 in the films appears to be thermally stable in air up to 1200°C. Temperature-programmed-reduction (TPR) measurements show that the bulk PrOy-ZrO2 material with a Pr:Zr molar ratio of 1:1 can store and release oxygen while that with a molar ratio of 1:3 cannot. The precursors play an important role in determining phase composition of the resulting PrOy-ZrO2 material. A mixture of monoclinic and cubic or tetragonal phases was found in PrOy-ZrO2 prepared from a new single-source heterometallic alkoxide, Pr2Zr6(μ4-O)2(μ-OAc)6 (μ-OiPr)10(OiPr)10, whereas a mixture of cubic and tetragonal phases was present in PrOy-ZrO2 made previously by coprecipitation from aqueous solutions of the metal nitrates.",

author = "Narula, {C. K.} and Taylor, {K. L.} and Haack, {L. P.} and Allard, {L. F.} and A. Datye and Sinev, {M. Yu} and M. Shelef and McCabe, {R. W.} and W. Chun and Graham, {G. W.}",

year = "1998",

language = "English",

volume = "497",

pages = "15--20",

journal = "Materials Research Society Symposium - Proceedings",

issn = "0272-9172",

note = "Proceedings of the 1997 MRS Fall Symposium ; Conference date: 01-12-1997 Through 02-12-1997",

}

TY - JOUR

T1 - Sol-gel precursors and the oxygen storage capacity of PrOy-ZrO2 materials

AU - Narula, C. K.

AU - Taylor, K. L.

AU - Haack, L. P.

AU - Allard, L. F.

AU - Datye, A.

AU - Sinev, M. Yu

AU - Shelef, M.

AU - McCabe, R. W.

AU - Chun, W.

AU - Graham, G. W.

PY - 1998

Y1 - 1998

N2 - The gels derived from mixtures of Pr(OiC3H7)3 and Zr(OiC3H7)4·iC3H7OH, upon hydrolysis and pyrolysis, furnish single-phase PrOy-ZrO2 materials crystallized in the fluorite structure. These materials can be coated onto high-surface-area γ-alumina powders or deposited onto dense α-alumina coupons in the form of thin films from a solution of parent alkoxides modified with 2,4-pentanedione in THF. The fluorite structure of the PrOy-ZrO2 in the films appears to be thermally stable in air up to 1200°C. Temperature-programmed-reduction (TPR) measurements show that the bulk PrOy-ZrO2 material with a Pr:Zr molar ratio of 1:1 can store and release oxygen while that with a molar ratio of 1:3 cannot. The precursors play an important role in determining phase composition of the resulting PrOy-ZrO2 material. A mixture of monoclinic and cubic or tetragonal phases was found in PrOy-ZrO2 prepared from a new single-source heterometallic alkoxide, Pr2Zr6(μ4-O)2(μ-OAc)6 (μ-OiPr)10(OiPr)10, whereas a mixture of cubic and tetragonal phases was present in PrOy-ZrO2 made previously by coprecipitation from aqueous solutions of the metal nitrates.

AB - The gels derived from mixtures of Pr(OiC3H7)3 and Zr(OiC3H7)4·iC3H7OH, upon hydrolysis and pyrolysis, furnish single-phase PrOy-ZrO2 materials crystallized in the fluorite structure. These materials can be coated onto high-surface-area γ-alumina powders or deposited onto dense α-alumina coupons in the form of thin films from a solution of parent alkoxides modified with 2,4-pentanedione in THF. The fluorite structure of the PrOy-ZrO2 in the films appears to be thermally stable in air up to 1200°C. Temperature-programmed-reduction (TPR) measurements show that the bulk PrOy-ZrO2 material with a Pr:Zr molar ratio of 1:1 can store and release oxygen while that with a molar ratio of 1:3 cannot. The precursors play an important role in determining phase composition of the resulting PrOy-ZrO2 material. A mixture of monoclinic and cubic or tetragonal phases was found in PrOy-ZrO2 prepared from a new single-source heterometallic alkoxide, Pr2Zr6(μ4-O)2(μ-OAc)6 (μ-OiPr)10(OiPr)10, whereas a mixture of cubic and tetragonal phases was present in PrOy-ZrO2 made previously by coprecipitation from aqueous solutions of the metal nitrates.

UR - http://www.scopus.com/inward/record.url?scp=0032296729&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0032296729

SN - 0272-9172

VL - 497

SP - 15

EP - 20

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

T2 - Proceedings of the 1997 MRS Fall Symposium

Y2 - 1 December 1997 through 2 December 1997

ER -

Sol-gel precursors and the oxygen storage capacity of PrO_y-ZrO₂ materials

Abstract

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