A solid-state probe for SO2/SO3 based on Na2SO4 I electrolyte

Jacob, K. T. ; Rao, Bhogeswara D. (1979) A solid-state probe for SO2/SO3 based on Na2SO4 I electrolyte Journal of the Electrochemical Society, 126 (11). pp. 1842-1847. ISSN 0013-4651

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Official URL: http://jes.ecsdl.org/content/126/11/1842.abstract

Related URL: http://dx.doi.org/10.1149/1.2128812


Conductivity measurements as a function of temperature and partial pressures of SO2, SO2, and O2, and transference experiments indicate that the transport number of Na+ ions is unity in Na2SO4I. A concentration cell based on this electrolyte Pt, O′2+SO′2+SO′3/Na2SO4I/SO2″ + SO2″ + O2″, Pt produces emf's that are in agreement with those calculated from the Nernst equation when equilibrium is assumed between the gas species at the electrodes. The cell can be used for monitoring the SO2/SO3 pollution in air, and in combination with an oxygen probe can be used for the determination of SO2/SO3 concentrations in coal combustion reactors, for the evaluation of the partial pressure of S2 in coal gasification systems, and for emission control in nonferrous smelters using sulfide ores. The probe is similar to that developed recently by Gauthier et aL (4, 5) using K2SO4 as the electrolyte, but can operate at higher pressures of SO3. Because of the greater polarizing power of the Na+ ion compared to the K+ ion, Na2S207 is less stable and can be formed only at a considerably higher pressure of S03 than that required for K2S2O7.

Item Type:Article
Source:Copyright of this article belongs to The Electrochemical Society.
Keywords:Electrochemical Sensors; Gas Sensors; Electrolytes; Ionic Conductivity; Sulphur Compounds; Oxygen Compounds; Chemical Equilibrium; Phase Diagrams; Electric Potential; Sensor; Detector; Galvanic Cell; Pollution Control; Emission Control; Sulfur Probe; Sulfur Dioxide; Sulfur Trioxide
ID Code:94781
Deposited On:15 Feb 2013 09:14
Last Modified:15 Feb 2013 09:14

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