Electrochemical Investigation of The Catalytical Processes During Sulfuric Acid Production.

Niels Bjerrum; Irina Petrushina; Rolf W. Berg

doi:10.1149/1.2044197

Electrochemical Investigation of The Catalytical Processes During Sulfuric Acid Production.

Niels Bjerrum, Irina Petrushina, Rolf W. Berg

Department of Chemistry

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Abstract

The electrochemical behavior of molten K2S2O7 and its mixtures with V2O5 [2–20 mole percent (m/o) V2O5] was studiedat 440°C in argon, by using cyclic voltammetry on a gold electrode. The effect of the addition of sulfate and lithium ions onthe electrochemical processes in the molten potassium pyrosulfate was also investigated. The potential window for pureK2S2O7 was estimated as 2.1 V, being limited by the S2O₇^2- oxidation and reduction. The oxidation of SO₄^-2 to oxygen isreversible in the basic melt. It is found that V(V) electroreduction proceeds in two steps. The first reduction stage [V(V) V(IV)], starting at 0.7–0.8 V vs. Ag+/Ag, is reversible for V2O5 concentrations lower than 5 m/o and at potential scan ratesless than 200 mV/s. For all studied compositions, the first reduction stage is a one-electron reaction. The second reductionstage [V(IV) --> V(III)], starting at 0.1–0.2 V, is irreversible and under ohmic control at all studied V2O5 concentrations. Thepresence of Li2SO4 causes a noticeable depolarization effect on the V(V) reduction and the V(IV) oxidation.

Original language	English
Journal	Journal of The Electrochemical Society
Volume	142
Issue number	6
Pages (from-to)	1805-1813
ISSN	0013-4651
DOIs	https://doi.org/10.1149/1.2044197
Publication status	Published - 1995

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Copyright The Electrochemical Society, Inc. [1995]. 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).

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@article{89c34c133045483789f26702c9870248,

title = "Electrochemical Investigation of The Catalytical Processes During Sulfuric Acid Production.",

abstract = "The electrochemical behavior of molten K2S2O7 and its mixtures with V2O5 [2–20 mole percent (m/o) V2O5] was studiedat 440°C in argon, by using cyclic voltammetry on a gold electrode. The effect of the addition of sulfate and lithium ions onthe electrochemical processes in the molten potassium pyrosulfate was also investigated. The potential window for pureK2S2O7 was estimated as 2.1 V, being limited by the S2O72- oxidation and reduction. The oxidation of SO4-2 to oxygen isreversible in the basic melt. It is found that V(V) electroreduction proceeds in two steps. The first reduction stage [V(V) V(IV)], starting at 0.7–0.8 V vs. Ag+/Ag, is reversible for V2O5 concentrations lower than 5 m/o and at potential scan ratesless than 200 mV/s. For all studied compositions, the first reduction stage is a one-electron reaction. The second reductionstage [V(IV) --> V(III)], starting at 0.1–0.2 V, is irreversible and under ohmic control at all studied V2O5 concentrations. Thepresence of Li2SO4 causes a noticeable depolarization effect on the V(V) reduction and the V(IV) oxidation.",

author = "Niels Bjerrum and Irina Petrushina and Berg, {Rolf W.}",

note = "Copyright The Electrochemical Society, Inc. [1995]. 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).",

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T1 - Electrochemical Investigation of The Catalytical Processes During Sulfuric Acid Production.

AU - Bjerrum, Niels

AU - Petrushina, Irina

AU - Berg, Rolf W.

N1 - Copyright The Electrochemical Society, Inc. [1995]. 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 - 1995

Y1 - 1995

N2 - The electrochemical behavior of molten K2S2O7 and its mixtures with V2O5 [2–20 mole percent (m/o) V2O5] was studiedat 440°C in argon, by using cyclic voltammetry on a gold electrode. The effect of the addition of sulfate and lithium ions onthe electrochemical processes in the molten potassium pyrosulfate was also investigated. The potential window for pureK2S2O7 was estimated as 2.1 V, being limited by the S2O72- oxidation and reduction. The oxidation of SO4-2 to oxygen isreversible in the basic melt. It is found that V(V) electroreduction proceeds in two steps. The first reduction stage [V(V) V(IV)], starting at 0.7–0.8 V vs. Ag+/Ag, is reversible for V2O5 concentrations lower than 5 m/o and at potential scan ratesless than 200 mV/s. For all studied compositions, the first reduction stage is a one-electron reaction. The second reductionstage [V(IV) --> V(III)], starting at 0.1–0.2 V, is irreversible and under ohmic control at all studied V2O5 concentrations. Thepresence of Li2SO4 causes a noticeable depolarization effect on the V(V) reduction and the V(IV) oxidation.

AB - The electrochemical behavior of molten K2S2O7 and its mixtures with V2O5 [2–20 mole percent (m/o) V2O5] was studiedat 440°C in argon, by using cyclic voltammetry on a gold electrode. The effect of the addition of sulfate and lithium ions onthe electrochemical processes in the molten potassium pyrosulfate was also investigated. The potential window for pureK2S2O7 was estimated as 2.1 V, being limited by the S2O72- oxidation and reduction. The oxidation of SO4-2 to oxygen isreversible in the basic melt. It is found that V(V) electroreduction proceeds in two steps. The first reduction stage [V(V) V(IV)], starting at 0.7–0.8 V vs. Ag+/Ag, is reversible for V2O5 concentrations lower than 5 m/o and at potential scan ratesless than 200 mV/s. For all studied compositions, the first reduction stage is a one-electron reaction. The second reductionstage [V(IV) --> V(III)], starting at 0.1–0.2 V, is irreversible and under ohmic control at all studied V2O5 concentrations. Thepresence of Li2SO4 causes a noticeable depolarization effect on the V(V) reduction and the V(IV) oxidation.

U2 - 10.1149/1.2044197

DO - 10.1149/1.2044197

M3 - Journal article

SN - 0013-4651

VL - 142

SP - 1805

EP - 1813

JO - Journal of The Electrochemical Society

JF - Journal of The Electrochemical Society

IS - 6

ER -

Electrochemical Investigation of The Catalytical Processes During Sulfuric Acid Production.

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