Novel metallic electric heating monolithic catalyst towards VOCs combustion
The development of metallic monolithic catalysts with various morphologies to catalyze the rapid combustion of volatile organic compounds (VOCs) under high space velocity is a profound challenge in catalyst research. Herein, we reported the preparation of novel electric heating monolithic Pt or Pd catalysts supported on FeCrAl metal wire. The catalysts exhibited high catalytic activity for the VOCs combustion to CO2 and H2O under low-current of DC power. Notably, the catalysts exhibited nearly 100% toluene and ethyl acetate conversion rates under the DC power of 5 W and 8 W and the space velocity of 30000 mL·h-1·g-1 with the combustion response time of less than 30 s. The exceptional activity of the catalysts can be attributed to the well-adhered alumina coating that formed on the surface of the FeCrAl metallic substrate after thermal treatment and the highly dispersed Pt and Pd nanoparticles on the surface of the alumina coating. Meanwhile, the surface temperature can instantly reach the desired ignition point, because of its high thermal conductivity and electrical conductivity.