Efficient Catalytic Removal of Formaldehyde over Ag/Co3O4–CeO2 Prepared by Different Method

A series of Co 3 O 4 –CeO 2 supported Ag catalysts were prepared by different methods and the catalytic properties of these catalysts were investigated for the catalytic removal of formaldehyde (HCHO). The Ag/Co 3 O 4 –CeO 2 –H catalyst calcined in a O 2 /N 2 flow and then reduced in a H 2 /N 2 stream exhibited excellent catalytic activity, over which 100% HCHO conversion was achieved at a temperature as low as 60 °C. In addition, the Ag/Co 3 O 4 –CeO 2 –H catalyst also displayed high stability in lifetime testing. Based on a variety of physical–chemical characterization results, it is demonstrated that the larger specific area, easier reducibility and abundant active surface oxygen species served as essential roles in the catalytic removal of HCHO for Ag/Co 3 O 4 –CeO 2 –H catalyst.