NOx Sensing Performances in Various Mixed Gases at High Temperature for Complex Impedance-Based Zirconia Sensor

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We have already reported that a new-type complex impedance-based zirconia sensor using a ZnCr2O4 sensing-electrode (SE) could detect total NOx content even at 700°C. Thus, we examined here the influence of various other gases on the NOx sensitivity of the present sensor. As a result, we found that the sensitivities to H2O as well as CO2 were little and the NOx sensitivity was hardly affected by the presence of H2O and CO2 with rather high concentrations. Although we found that the sensitivities to H2, C3H6 and C3H8 were relatively high, they might be reduced by installing an oxidation catalyst in the upper stream of the sensor element. Here, we confirmed that the NO sensitivity was almost equal to the NO2 sensitivity and a linear relationship was observed between sensitivity and NOx concentration even in the coexistence of 8 vol% H2O and 15 vol% CO2. Furthermore, it was found that the NOx sensitivity was affected by the change in concentration of oxygen in the sample gas.
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