F127 assisted synthesis of Bi promoted Co3O4 catalyst for catalyzing N2O decomposition in presence of impurity gases

In this paper, Bi promoted Co3O4 catalysts used for catalyzing N2O decomposition were successfully prepared by improved sol-gel method with the assistance of F127. It was found that the doping of additive Bi not only did not change the unique "Yardang Landform" microstructure of the 3.0F-Co3O4, but also prompted Co3O4 to expose more active crystal planes, such as (422), (533) and (620). Moreover, the doping of the additive Bi also enhanced the catalyst's specific surface area, and further weakened the surface Co-O bond. The optimum 3.0F-Bi0.015Co catalyst achieved >88 % N2O conversion (2000 ppmv N2O/Ar, GHSV=20,000 h(-1)) at 300 degrees C, and its corresponding TOF value increased from 1.50 x 10(-3) s(-1) for 3.0F-Co3O4 to 3.63 x 10(-3) s(-1). Meanwhile, the E-a of 3.0F-Bi0.015Co was as low as 47.0 kJ mol(-1). Most importantly, the catalyst has good resistance to O-2 and H2O. Under the harsh condition (both 5 vol.% O-2, 100 ppmv NO and 2 vol.% H2O were coexisted in the reaction system), the N2O conversion over the 3.0F-Bi0.015Co catalyst can be stable above 90 % at 400 degrees C.