A facile route for spraying preparation of Pt/TiO2 monolithic catalysts toward VOCs combustion

This study presents an efficient, economic, and simple preparation strategy for Pt/TiO2 monolith catalysts. Nano-Pt/TiO2 dispersion liquid with good activity and stability was synthesized by hydrolysis and chemical reduction method. Various Pt/TiO2 monolithic catalysts were prepared by spraying the dispersion liquid on different substrates. Results of transmission electron microscopy, scanning electron microscopy, N-2 adsorption-desorption, H-2 temperature-programmed and CO oxidation showed that the Pt/TiO2 nanoparticles with good mesoporous structure and redox properties were highly dispersed on the substrate. The as-prepared 0.5 Pt/TiO2 cordierite monolithic catalyst with 0.1 wt%s Pt content exhibited excellent catalytic combustion activity (T-90 of toluene combustion was 212 degrees C), stability (no deactivation was observed during a 120 h test) and firmness (mass loss was 0.11% after 1 h ultrasonic vibration) under experimental conditions. Compared with state-of-the-art methods, this method is more suitable for large-scale production of waste-gas-treated monolith catalysts. And this method meets the concept of energy saving and emission reduction because of its simplicity, high efficiency, environmental friendliness, and high utilization of active components.