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Pd deposited on CeO x -MnO x /La-Al 2 O 3 has been prepared as a sensitive material for methane (CH 4 ) detection. The effect of different amounts (1.25%, 2.5% and 5%) of Pd loading has been investigated. The as prepared materials were deposited on Pt microcoils using a drop-coating method, as a way of developing pellistors operated using a Wheatstone bridge configuration. By spanning the operating temperature range between 300 °C and 550 °C, we established the linearity region as well as the maximum sensitivity towards 4900 ppm of CH 4 . By making use of the sigmoid dependence of the output voltage signal from the Wheatstone bridge, the gas surface reaction and diffusion phenomena have been decoupled. The pellistor with 5% Pd deposited on CeO x -MnO x /La-Al 2 O 3 exhibited the highest selective-sensitivity in the benefit of CH 4 detection against threshold limits of carbon monoxide (CO), sulfur dioxide (SO 2 ) and hydrogen sulfide (H 2 S). Accordingly, adjusting the percent of Pd makes the preparation strategies of pellistors good candidates towards CH 4 detection.

Methane Combustion Using Pd Deposited on CeOx-MnOx/La-Al2O3 Pellistors