Effect of reduction pretreatments on PdAg/Al2O3 for HCHO and CO oxidation

PdAg/Al2O3 were pretreated by CO and H-2 reduction pretreatments, respectively. The reduced catalysts were tested for HCHO and CO oxidation and characterized by Brunner Emmet Teller (BET), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and oxygen temperature programmed desorption (O-2-TPD). These results indicate that the pretreatments have effect on PdAg reconstruction, PdAg particle size and active oxygen species, which are responsible for the catalytic performance. Compared with H-2 reduction method, CO reduction is more suitable for PdAg/Al2O3 pretreatment. PdAg/Al2O3-CO exhibited better catalytic performance. (C) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.