A novel methane(CH

4

)sensor detection scheme is proposed based on the yttria-stabilized zirconia(YSZ)-based limiting current type oxygen sensor.A simulated working system with the same working process as the sensor is built

and the feasibility of the detection scheme is verified through the system:A palladium(Pd)loaded molecular zeolite (Pd/NaLa-ZSM—5)catalyst is prepared to catalyze CH

4

.The limiting current difference caused by the change of oxygen(O

2

)concentration in the mixture before and after CH

4

catalytic combustion is measured by YSZ-based limiting current type oxygen sensor

and the CH

4

concentration is calculated by inverse calculation.The experimental results show that when the reaction temperature of the catalyst reaches 350℃ or above

the sensitivity of the system is not less than 266.79nA/10

-6

and the measured CH

4

concentration and oxygen sensor limit current difference(Δ

I

)has high linearity (

R

2

=0.999)

and has good selectivity and repeatability.These results show that the detection scheme has a good guiding significance for the development of CH

4

sensors in high-temperature environment of natural gas combustion engine.