Synthesis of CeyMn(1-y)Ox solid solution catalysts with superior photothermal catalytic performance for acetone removal under ambient condition

Abstract

Cerium-manganese solid solution catalysts were prepared by sol-gel method. X-ray diffraction, Raman, UV–Vis-IR diffuse reflectance spectroscopy, and H2 temperature programmed reduction (H2-TPR) were used to characterize the as-prepared catalysts. Introduction of Mnx+ into CeO2 lattice dramatically improved the full solar spectrum absorption ability, as well as the lattice oxygen mobility of the catalysts. The Ce0.25Mn0.75Ox catalyst presents much better low temperature reducibility due to the presence of readily reduced Mnx+ species in CeO2 lattice. Ce0.25Mn0.75Ox shows a superior photothermal catalytic activity for the degradation of gaseous acetone under visible-infrared irradiation (150 mW/cm2), which gives a reaction rate constant of 11.0 times higher than that with MnOx. During the whole process, the air temperature in catalytic system never exceeds 42 °C, suggesting the achievement of the efficient photothermal catalysis for acetone removal under ambient condition. This work provides an alternative strategy in environmental protection field for efficient volatile organic compounds removal in indoor environment.