Effect of different reduction methods on Pd/Al2O3 for o-xylene oxidation at low temperature
Xue Han , Mingyu Fan , Yafei Wang , Jianghao Zhang , Changbin Zhang
DOI:10.1016/j.jes.2021.11.013
Received August 26, 2021,Revised , Accepted November 13, 2021, Available online February 03, 2022
Volume 35,2023,Pages 95-100
Pd/Al2O3 was pretreated by CO, H2 and NaBH4 reduction, respectively. The reduced catalysts were tested for o-xylene oxidation and characterized by power X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and temperature-programmed decomposition of palladium hydride (TPDH). The characterizations indicate the pretreatments lead to distinct Pd particle sizes and amount of surface activated oxygen species, which are responsible for the catalytic performance. Compared with H2 and NaBH4 reduction methods, CO reduction shows a strong interaction between Pd and Al2O3 with smaller Pd particle size and more surface activated oxygen. It exhibited excellent catalytic performance, complete oxidation of 50 ppmV o-xylene at 85°C with a WHSV of 60,000 mL/(g∙hr).
