SO42--modified La, Y-doped ceria-zirconia with high oxygen storage capacity and its application in Pd-only three-way catalysts

As the oxygen redox ability shows great effects on the catalytic performances of ceria-zirconia based materials, many strategies have been utilized to improve the oxygen storage capacity. Here in this study, we report a simple and facile approach to prepare a SO42--modified La, Y-doped ceria-zirconia material (SO/CZLY-f) with high oxygen storage capacity. Due to the additional redox process between SO42- and S2-, oxygen storage capacity of SO/CZLY-f (745.3 mmol O-2/g) is about 1.6 times higher than that of La, Y -doped ceria-zirconia material without SO42- modification. Moreover, the catalytic activities and stability of the corresponding Pd-only three-way catalyst were measured. Compared to that of Pd@CZLY-f, the operation window of CO, full conversion temperature of HC and NO over Pd@SO/CZLY-f are obviously widened and lowered, respectively. After aging treatment at 1100 degrees C for 4 h, the superiority of aged Pd-loading composite is still maintained. (c) 2021 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.

Automated summary

This study reports a simple and facile approach to prepare a SO42--modified La, Y-doped ceria-zirconia material with high oxygen storage capacity. The modified material exhibited a 1.6 times higher oxygen storage capacity compared to the unmodified material, and also showed improved catalytic activities and stability.