High temperature Ag+β”-alumina in situ sensor for sulfur-containing gases

The paper reports the development of high temperature in situ fully solid electrochemical sensor for sulfur-containing gases monitoring. The sensor is based on Ag+β”-Al2O3 membrane with Ag2S or Ag2SO4 layer on its surface. Silver beta alumina was manufactured by high temperature ion exchange technique in AgNO3 melt. The original design of the in situ sensor was developed. Three types of galvanic cells were used for the investigation of electromotive force (EMF) response on SO2 partial pressure both in oxygen-free and oxygen-containing atmosphere in the temperature range 673–923 K. The data obtained was compared with following Nernst equations. The applicability of the sensor for in situ measurements in industrial processes is discussed.