Bimetallic nanoparticle catalysts attract extensive attention for relevant catalysis processes due to their flexible structures, while the structure evolution under specific conditions is ambiguous. This paper describes the structure evolution of Pt-Sn bimetallic nanoparticles for catalytic dehydrogenation, especially Sn segregation for surface recovery of a Pt-Sn alloy. An acid etching-reduction process was adopted to investigate the migration of Sn atoms after surface Sn species loss. The recovery of the Pt-Sn alloy through Sn segregation could enable catalysts to overcome component fluctuations, making an efficient catalytic process.

Jieli Wang, Xin Chang, Sai Chen, Guodong Sun, Xiaohong Zhou, Evgeny Vovk, Yong Yang, Wanyu Deng, Zhi-Jian Zhao, Rentao Mu, Chunlei Pei, and Jinlong Gong*. On the Role of Sn Segregation of Pt-Sn Catalysts for Propane Dehydrogenation. ACS Catal. 2021, 11, 8, 4401-4410.

https://pubs.acs.org/doi/10.1021/acscatal.1c00639