Ambient photothermal catalytic CO oxidation over a carbon-supported palladium catalyst

The XC-72R supported Pd catalysts exhibit low-temperature catalytic activity for CO oxidation under light irradiation. The CO conversion can reach 100% with the light irradiation of 900 mW center dot cm-2 at a catalyst temperature of 100 degrees C. Pd/C catalysts with different Pd loading have similar performance enhancement under light irradiation. The activation energy of 1% Pd/C catalyst remains unchanged implying that CO oxidation belongs to photothermal catalytic oxidation. The enhanced performance could be ascribed to ultrahigh surface temperature (275 degrees C) induced by the light irradiation of 800 mW center dot cm-2 and detected by an IR camera. That is higher than the catalyst temperature (187 degrees C) measured by the thermocouple. Carbon generates a higher temperature than Pd NP, causing heat transfers from carbon to Pd NP. In contrast, Pd NP produces a higher temperature than Al2O3 for Pd/Al2O3 catalyst, and heat is transferred from Pd to Al2O3. These demonstrate that the enhanced performance contributes to the photothermal effect of carbon.

Automated summary

The XC-72R supported Pd catalysts exhibit low-temperature catalytic activity for CO oxidation under light irradiation, with a significant performance enhancement attributed to the photothermal effect of carbon.