Abstract
LaTi1−xMnxO3+δ (x = 0.2 and 0.4) perovskite-type catalysts are synthesized by acrylamide polymerization route and etched with diluted HNO3 for oxidation of toluene as one of typical volatile organic compounds (VOCs). The substitution of Mn cations improves catalytic activity (toluene conversion increased from 0 to 50.6% by substituting 40% of Ti cations with Mn cations) by improving abilities of light absorption and light-to-heat conversion, and acid etching further promotes catalytic activity (toluene conversion increased from 50.6%–95.6% for LaTi0.6Mn0.4O3+δ) by enlarging specific surface area, generating more surface active oxygen, strengthening mobility of surface oxygen, and improving low-temperature reducibility. To explore the origin of the light-driven photothermocatalytic activity of A-LaTi0.6Mn0.4O3+δ by EPR analysis, O2 desorption and H2 consumption, we find that the light is not only as a thermal source to provide energy for toluene oxidation but also can promote oxidation reaction by photoactivation.
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