Porous unsupported CuO nanoplates for efficient photothermal CO oxidation

摘要

It is a significant issue for environmental protection and industrial production to eliminate CO, a gas harmful to life and some important reaction sites. Real environmental conditions require catalytic CO oxidation to occur at relatively low temperature. Nowadays, photothermal catalysis has been exploited as a new way to achieve CO elimination, different from thermal catalysis. CuO, as cheap and abundant substitute for precious metals, is considered to have potential in photothermal catalysis. Oxygen vacancies (O-V) and lattice oxygen (O-L) activity are considered extremely crucial for oxide catalysts in CO oxidation, according to Mars-van Krevelen mechanism. Herein, porous CuO nanoplates with adjustable O-V and O-L activity were prepared by a facile method via controlling the morphology and phase composition of precursors. The light-off temperature (50% conversion) of the best sample obtained under the optimal conditions was similar to 110 degrees C and an almost complete conversion was reached at similar to 150 degrees C. It also achieved nearly 70% conversion under 6 standard Suns (6 kW cm(-2) irradiation) and could work in infrared radiation (IR) regions, which could be attributed to the photo-induced thermal effect and activation effect. The simple synthesis and characterization provide a good example for the future photothermal catalysis.