A catalytic-combustion-type carbon monoxide gas sensor operable at a low temperature was devised by employing a Pt-loaded cerium oxide–zirconium oxide–tin oxide solid solution as a novel oxidizing catalyst. Since this catalyst can oxidize CO at low temperatures, the sensor with the Pt-loaded CeO2–ZrO2–SnO2 catalyst exhibits a smooth and reproducible response to CO gas at 70 °C, which is a significantly lower temperature than that required for the operation of sensors with the conventional CO oxidation catalysts Pt/Al2O3 or Pd/Al2O3.
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Hosoya et al. (2013) studied this question.
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