Complex formation during dissolution of metal oxides in molten alkali carbonates

Qingfeng Li; Flemming Borup; Irina Petrushina; Niels Bjerrum

doi:10.1149/1.1391954

Complex formation during dissolution of metal oxides in molten alkali carbonates

Qingfeng Li, Flemming Borup, Irina Petrushina, Niels Bjerrum

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

1034 Downloads (Pure)

Abstract

Dissolution of metal oxides in molten carbonates relates directly to the stability of materials for electrodes and construction of molten carbonate fuel cells. In the present work the solubilities of PbO, NiO, Fe2O3,and Bi2O3 in molten Li/K carbonates have been measured at 650 degrees C under carbon dioxide atmosphere. It is found that the solubilities of NiO and PbO decrease while those of Fe2O3 and Bi2O3 remain approximately constant as the lithium mole fraction increases from 0.43 to 0.62 in the melt. At a fixed composition of the melt, NiO and PbO display both acidic and basic dissolution as the partial pressure of carbon dioxide varies. By combination of solubility and electromotive force measurements, a model is constructed assuming the dissolution involves complex formation. The possible species for lead are proposed to be [Pb(CO3)(2)](-2) and/or [Pb(CO3)(3)](-4). A similar complex chemistry for nickel oxide dissolution might be expected. (C) 1999 The Electrochemical Society. S0013-4651(98)11-017-0. All rights reserved.

Original language	English
Journal	Journal of The Electrochemical Society
Volume	146
Issue number	7
Pages (from-to)	2449-2454
ISSN	0013-4651
DOIs	https://doi.org/10.1149/1.1391954
Publication status	Published - 1999

Bibliographical note

Copyright The Electrochemical Society, Inc. [1999]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

Access to Document

10.1149/1.1391954

NielsFinal published version, 183 KB

http://dx.doi.org/10.1149/1.1391954

OpenUrl availability

Full text

Cite this

@article{6fcdb540425646dd80f719f2c0d947c0,

title = "Complex formation during dissolution of metal oxides in molten alkali carbonates",

abstract = "Dissolution of metal oxides in molten carbonates relates directly to the stability of materials for electrodes and construction of molten carbonate fuel cells. In the present work the solubilities of PbO, NiO, Fe2O3,and Bi2O3 in molten Li/K carbonates have been measured at 650 degrees C under carbon dioxide atmosphere. It is found that the solubilities of NiO and PbO decrease while those of Fe2O3 and Bi2O3 remain approximately constant as the lithium mole fraction increases from 0.43 to 0.62 in the melt. At a fixed composition of the melt, NiO and PbO display both acidic and basic dissolution as the partial pressure of carbon dioxide varies. By combination of solubility and electromotive force measurements, a model is constructed assuming the dissolution involves complex formation. The possible species for lead are proposed to be [Pb(CO3)(2)](-2) and/or [Pb(CO3)(3)](-4). A similar complex chemistry for nickel oxide dissolution might be expected. (C) 1999 The Electrochemical Society. S0013-4651(98)11-017-0. All rights reserved.",

author = "Qingfeng Li and Flemming Borup and Irina Petrushina and Niels Bjerrum",

note = "Copyright The Electrochemical Society, Inc. [1999]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).",

year = "1999",

doi = "10.1149/1.1391954",

language = "English",

volume = "146",

pages = "2449--2454",

journal = "Journal of The Electrochemical Society",

issn = "0013-4651",

publisher = "The Electrochemical Society",

number = "7",

}

TY - JOUR

T1 - Complex formation during dissolution of metal oxides in molten alkali carbonates

AU - Li, Qingfeng

AU - Borup, Flemming

AU - Petrushina, Irina

AU - Bjerrum, Niels

N1 - Copyright The Electrochemical Society, Inc. [1999]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

PY - 1999

Y1 - 1999

N2 - Dissolution of metal oxides in molten carbonates relates directly to the stability of materials for electrodes and construction of molten carbonate fuel cells. In the present work the solubilities of PbO, NiO, Fe2O3,and Bi2O3 in molten Li/K carbonates have been measured at 650 degrees C under carbon dioxide atmosphere. It is found that the solubilities of NiO and PbO decrease while those of Fe2O3 and Bi2O3 remain approximately constant as the lithium mole fraction increases from 0.43 to 0.62 in the melt. At a fixed composition of the melt, NiO and PbO display both acidic and basic dissolution as the partial pressure of carbon dioxide varies. By combination of solubility and electromotive force measurements, a model is constructed assuming the dissolution involves complex formation. The possible species for lead are proposed to be [Pb(CO3)(2)](-2) and/or [Pb(CO3)(3)](-4). A similar complex chemistry for nickel oxide dissolution might be expected. (C) 1999 The Electrochemical Society. S0013-4651(98)11-017-0. All rights reserved.

AB - Dissolution of metal oxides in molten carbonates relates directly to the stability of materials for electrodes and construction of molten carbonate fuel cells. In the present work the solubilities of PbO, NiO, Fe2O3,and Bi2O3 in molten Li/K carbonates have been measured at 650 degrees C under carbon dioxide atmosphere. It is found that the solubilities of NiO and PbO decrease while those of Fe2O3 and Bi2O3 remain approximately constant as the lithium mole fraction increases from 0.43 to 0.62 in the melt. At a fixed composition of the melt, NiO and PbO display both acidic and basic dissolution as the partial pressure of carbon dioxide varies. By combination of solubility and electromotive force measurements, a model is constructed assuming the dissolution involves complex formation. The possible species for lead are proposed to be [Pb(CO3)(2)](-2) and/or [Pb(CO3)(3)](-4). A similar complex chemistry for nickel oxide dissolution might be expected. (C) 1999 The Electrochemical Society. S0013-4651(98)11-017-0. All rights reserved.

U2 - 10.1149/1.1391954

DO - 10.1149/1.1391954

M3 - Journal article

SN - 0013-4651

VL - 146

SP - 2449

EP - 2454

JO - Journal of The Electrochemical Society

JF - Journal of The Electrochemical Society

IS - 7

ER -

Complex formation during dissolution of metal oxides in molten alkali carbonates

Abstract

Bibliographical note

Access to Document

OpenUrl availability

Fingerprint

Cite this