P2GS.23 - Au- and Ni-promoted Ce-Zr catalytic filter-SnO2 integrated sensor for dual selective detection of ethanol and methane

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-2 - Gas Sensors
F. Fateminia, A. Khodadadi, Y. Mortazavi - School of Chemical Engineering, Colleges of Engineering, University of Tehran, Tehran (Iran)
811 - 812


Gold and nickel nanoparticles on the Ce0.8Zr0.2O2 mixed oxide are used as a catalytic filters for selective detection of ethanol and methane in presence of CO. Thick film SnO2 gas sensor was covered with Au/Ce-Zr or Ni/Ce-Zr thick layers, to oxidize either CO or ethanol at different temperatures. A flow system was used to measure the sensor response to 300 ppm carbon monoxide or ethanol and 5000 ppm methane at 100-480ºC. Without using the filter, the SnO2 sensor shows comparable responses to carbon monoxide and methane and much higher ones to ethanol. The Au/Ce-Zr catalytic filter completely converts carbon monoxide and ethanol to the insensitive CO2 at 200 and 350ºC, respectively. The corresponding temperatures for Ni/Ce-Zr catalytic filter are 380 and 410ºC. No significant conversion of methane is observed at 100-480ºC on none of the filters. The operating temperatures of the sensor covered with Au/Ce-Zr filter for selective detection of ethanol and methane are 200°C and higher than 350°C, respectively. Applying Ni/Ce-Zr as a catalytic filter in the sensor-filter combination results in selectivity to methane at 400ºC. This way the integration of the sensor and Au/Ce-Zr catalytic filter with dual selectivity has a higher performance than Ni/Ce-Zr filter.