Formation of hydrided Pt-Ce-H sites in efficient, selective oxidation catalysts
Ji Yang, Lorenz J. Falling, Siyang Yan, Biluan Zhang, Pragya Verma, Luke Daemen, Yongqiang Cheng, Xiao Zhao, Shuchen Zhang, Jeng‐Lung Chen, Bingqing Yao, Shengdong Tan, Sudong Chae, Qian He, Slavomír Nemšák, Zili Wu, David Prendergast, Yanbing Guo, Jiaxu Liu, Miquel Salmerón, Ji Su
Abstract
Single-atom site catalysts can improve the rates and selectivity of many catalytic reactions. We have modified Pt 1 /CeO 2 single sites by combining them with molecular groups and with oxygen vacancies of the support. The new sites include hydrided (Pt 2+ -Ce 3+ H δ− ) and hydroxylated (Pt 2+ -Ce 3+ OH) sites that exhibit higher reactivity and selectivity to previous single sites for several reactions, including a ninefold increase in the reaction rate for carbon monoxide oxidation and a 2.3-fold improvement of propylene selectivity for oxidative dehydrogenation of propane. The atomic structure and reaction steps of these sites were determined with in situ and ex situ spectroscopy techniques and theoretical methods.