Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K2S2O7-KHSO4 System Full article
Journal |
Journal of Physical Chemistry (up to 1996)
ISSN: 0022-3654 |
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Output data | Year: 1996, Volume: 100, Number: 25, Pages: 10771-10778 Pages count : 8 DOI: 10.1021/jp953744l | ||||||
Tags | COMPLEX-FORMATION; PYROSULFATE MELTS; V2O5-K2S2O7; OXIDATION; DENSITY; SALTS; SO2 | ||||||
Authors |
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Affiliations |
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Funding (4)
1 | European Commission | BRE2.CT93.0447 |
2 | European Commission | ERBCHBGCT920129 |
3 | International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union | 93-3244 |
4 | Russian Foundation for Basic Research | 95-03-08365 |
Abstract:
The phase diagram of the catalytically important K2S2O7−KHSO4 solvent system has been investigated by means of electrochemical, thermal, and spectroscopic methods. The phase diagram exhibits a eutectic at ΧKHSO4 = 0.94(1) with a temperature of fusion of 205 °C. No compound is formed in the system, but the strong α → β solid−solid transition of K2S2O7, found at 318 °C with ΔHtr = 21.8 kJ/mol, gives rise to a marked change in the slope of the liquidus curve at this temperature. The experimental phase diagram is in very good accordance with a calculated diagram based on the assumption of an ideal liquid mixture. 39K, 1H, 17O, and 33S NMR measurements on the molten K2S2O7−KHSO4 mixtures up to 540 °C show that a fast ionic exchange takes place in the melt at all compositions. The conductivities of the solid and molten K2S2O7−KHSO4 systems were measured at 13 different compositions in the whole composition range, ΧKHSO4 = 0−1. For each composition in the temperature range examined , the conductivity of the molten mixtures has been expressed by equations of the form κ = A(Χ) + B(Χ)(T − 600) + C(Χ)(T − 600)2. The measurements indicate an enhanced molar conductivity of the binary system, probably due to delocalization of the conducting ions compared to the pure molten components.
Cite:
Eriksen K.M.
, Fehrmann R.
, Hatem G.
, Gaune-Escard M.
, Lapina O.B.
, Mastikhin V.M.
Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K2S2O7-KHSO4 System
Journal of Physical Chemistry (up to 1996). 1996. V.100. N25. P.10771-10778. DOI: 10.1021/jp953744l WOS Scopus РИНЦ
Conductivity, NMR, Thermal Measurements, and Phase Diagram of the K2S2O7-KHSO4 System
Journal of Physical Chemistry (up to 1996). 1996. V.100. N25. P.10771-10778. DOI: 10.1021/jp953744l WOS Scopus РИНЦ
Dates:
Submitted: | Dec 18, 1995 |
Accepted: | Apr 1, 1996 |
Published print: | Jun 20, 1996 |
Published online: | Jun 20, 1996 |
Identifiers:
Web of science | WOS:A1996UT21300040 |
Scopus | 2-s2.0-33748503590 |
Elibrary | 13225504 |
Chemical Abstracts | 1996:321286 |
Chemical Abstracts (print) | 124:353801 |
OpenAlex | W2313389866 |