Pt-CuMnCeOx/堇青石微波催化燃烧VOCs性能

微波催化燃烧是一项新的VOCs处理技术，提升VOCs处理效率的关键在于开发催化活性更高、性能更稳定的催化剂。将贵金属Pt与铜锰铈金属氧化物复合制备了Pt-CuMnCeO_x/堇青石催化剂，SEM、BET和XRD表征基础上测试催化剂对双组分VOCs-甲苯和乙酸乙酯的催化活性与稳定性。研究表明，Pt的复合提高了催化剂表面活性颗粒的分散性，增大了催化剂的比表面积和孔体积，升高了铜锰价态而提高了催化剂的低温催化活性。微波功率40 W时，Pt-CuMnCeO_x/堇青石催化剂的甲苯和乙酸乙酯的降解效率高出CuMnCeO_x/堇青石16%和11%；微波功率70 W时，Pt-CuMnCeO_x/堇青石催化剂可完全去除甲苯和乙酸乙酯，总VOCs去除率达97%左右且活性保持稳定。本研究结果可为微波催化燃烧VOCs技术提供参考。

Application of Pt-CuMnCeOx/Cordierite catalyst in microwave catalytic combustion of VOCs

Microwave catalytic combustion is an emerging technology for VOCs treatment, and preparation of the catalyst with higher catalytic activity and stability is the key to highly efficient VOCs removal. Noble metal Pt was composited with copper-manganese-cerium oxides and loaded on the surface of honeycomb cordierite carrier to prepare a Pt-CuMnCeOx/Cordierite catalyst by incipient-wetness impregnation method. Based on SEM, BET and XRD characteristics, the catalytic activity and stability of three catalysts in microwave catalytic combustion of bi-component VOCs toluene and ethyl acetate were tested in this work. The experimental results showed that Pt composition improved the dispersion of active particles on the catalyst surface, increased specific surface area and pore volume of the catalyst and lifted valence states of copper and manganese to enhance the low temperature catalytic activity of the catalyst greatly. The removal efficiencies of toluene and ethyl acetate on the surface of Pt-CuMnCeOx/Cordierite catalyst were higher 16% and 11% than CuMnCeOx/Cordierite catalyst under 40 W of microwave power. Toluene and ethyl acetate were degraded completely by Pt-CuMnCeOx/Cordierite catalyst under 70 W of microwave power, and the removal rate of total VOCs reached 97% simultaneously. Pt-CuMnCeOx/cordierite catalyst exhibited a high catalytic activity and an excellent stability during consecutive seven times test. This study can provide a reference for microwave catalytic combustion of VOCs technology.