A low temperature catalytic combustible gas sensor based on Ru supported zeolite catalyst films

Catalyst based on Ru loaded HZSM5 zeolite is prepared by a wet impregnation method, which is screen printed onto alumina substrates and serves as sensitive materials for the catalytic combustion sensor. The results show that Ru-HZSM5 catalyst has a high catalytic activity to combustible gases such as hydrogen (H 2 ) and carbon monoxide (CO) at low temperature. However, a poor dispersion of Ru reduces the catalytic activity of the catalyst when the Ru loading is too high. It is due to the pore structure of the sensitive material which facilitates the acquisition of high dispersion characteristics and gas selective regulation. The catalytic sensor based on Ru-HZSM5 also has high selectivity for combustible gases. Due to the low operating temperature, the sensor has a high selectivity for combustible gases and no cross-response to interfering gases such as ammonia (NH 3 ) and volatile organic compound (VOCs). Therefore, the catalytic type gas sensor with low power consumption and good selectivity can be used for monitoring CO, H 2 and other combustible gases.