Effects of Flameless Catalytic Combustion of Hydrogen on the Parameters of Catalytic Sensors with Platinum-group Catalysts

The response of catalytic hydrogen sensors with platinum-group catalysts (Pt + 3Pd, Pt, Pd, Ir, and Rh) in the room temperature range has been studied. It was demonstrated that a flameless catalytic hydrogen combustion reaction on the Pt and Pt + 3Pd catalysts occurs at 20 degrees C, which results in the heating of the sensing element of a catalytic sensor, and the microheater resistance increases. The microheater temperature was first measured, and it was shown that the temperature increases by 99 and 83 degrees C in the calibration gas mixture containing 0.96% vol. hydrogen for the Pt and Pt + 3Pd catalysts, respectively. A method has been provided for measuring hydrogen levels using a catalytic sensor without heating voltage input.