Experiments were performed at 400 °C and 1.0 atm with a C2H6/O2/He molar ratio of 30/20/50 and a diluter-to-M1 catalyst mass ratio of ((▴▵) 1:4, (●○) 5:1 and (■□) 10:1 at a reactor inlet. (C) Ethane and oxygen conversion as functions of contact time, M1 ...