Abstract
Pd deposited on CeOx-MnOx/La-Al2O3 has been prepared as a sensitive material for methane (CH4) 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 CH4. 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 CeOx-MnOx/La-Al2O3 exhibited the highest selective-sensitivity in the benefit of CH4 detection against threshold limits of carbon monoxide (CO), sulfur dioxide (SO2) and hydrogen sulfide (H2S). Accordingly, adjusting the percent of Pd makes the preparation strategies of pellistors good candidates towards CH4 detection.
Highlights
As the primary component of natural gas, methane (CH4 ) is an odorless, highly flammable gas with an overall global warming potential even higher than carbon dioxide (CO2 )
The slope tangent to the curve is moving towards lower increase in Pd concentration, the slope tangent to the curve is moving towards lower temperatures, temperatures, meaning that the rateisofdependent combustion dependent onPd the amount of Pd loading [41]
The built pellistors were subject to CH4 detection over a wide range of operating temperature regimes
Summary
As the primary component of natural gas, methane (CH4 ) is an odorless, highly flammable gas with an overall global warming potential even higher than carbon dioxide (CO2 ). Its concentration in the surrounding atmosphere is continuously increasing, mainly due to the petrochemical and oil industries, pipe leakage, accidental releases during gas conduction, storage, or distribution and due to the anaerobic decomposition of animal waste [1,2,3,4]. Natural gas is the second most employed source of energy owing to its abundance and straightforward burning processes [5]. Solutions are required for widespread monitoring of methane emissions. A large diversity of CH4 sensors, involving different technologies, have been developed [6]. From the phenomenological point of view, CH4 reduces the oxygen species from the catalytic material surface, leading to an exothermic reaction translated into
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