Enhanced low-temperature catalytic performance for toluene combustion of CeO2-supported Pt-Ir alloy catalysts

• Published in: Applied surface science 2022-04, Vol.580, p.152278, Article 152278
• Main Authors: Zhang, Yue, Wu, Cong, Wang, Zhiqiang, Ji, Jiawei, Wan, Haiqin, Zou, Weixin, Tong, Qing, Sun, Jingfang, Dong, Lin, Chen, Yu-Wen
• Format: Article
• Language: English
• Subjects: Catalytic oxidation; Cerium dioxide; Pt-Ir alloy nanoparticle; Reaction pathway; Toluene
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2021.152278

[Display omitted] •The PtxIr alloy nanoparticles were fabricated via ethylene glycol reduction method.•The Pt2.5Ir/CeO2 catalysts shows an excellent activity for toluene combustion.•The Pt2.5Ir/CeO2 has abundant oxygen vacancies and the best reducibility.•The interaction between Pt and Ir is helpful for the best activity of Pt2.5Ir/CeO2.•The possible reaction pathway over Pt2.5Ir/CeO2 is studied by the in-situ DRIFTS. Herein, bimetallic Pt-Ir alloy nanoparticles (NPs) were successfully fabricated by ethylene glycol reduction of H2PtCl6·6H2O and IrCl3 through a microwave-assisted method. The Pt-Ir alloy NPs were deposited on CeO2 catalysts for toluene combustion. The Pt2.5Ir/CeO2 sample exhibited better catalytic activity at low reaction temperature, compared with monometallic catalysts. The excellent low-temperature catalytic activity was resulted from the interaction between Pt and Ir, richer adsorbed oxygen species and low-temperature reducibility. Furthermore, the in-situ DRIFTS was used to investigate the possible reaction pathway of Pt2.5Ir/CeO2. It showed that the broken of benzene ring on Pt2.5Ir/CeO2 can be accomplished at lower temperature, resulting in enhancing the deep oxidation of toluene.