Low‐temperature Water‐gas Shift Reaction Enhanced by Oxygen Vacancies in Pt‐loaded Porous Single‐crystalline Oxide Monoliths
Shaobo Xi, Jie Zhang, Kui Xie
Abstract
Abstract Water‐gas shift (WGS) reaction at low temperature plays an important role in hydrogen production from fossil fuels and hydrogen purification for proton‐exchange membrane fuel cells. However, the activation of H 2 O is a critical reaction step that greatly limits the overall performance during WGS reaction. Here we fabricate porous single‐crystalline (PSC) MoO 3 monoliths at 1 cm scale and deposit atomic‐layered Pt clusters at the lattice surface to create the interfacial system toward the low‐temperature WGS reaction. The single‐crystalline nature stabilizes the oxygen vacancies (V O ) at lattice and facilitates the effective activation of H 2 O at the interface. We show the highest Pt‐normalized activity of 0.86 mol CO mol Pt −1 s −1 for the ultra‐low temperature WGS reaction at 120 °C. The single‐crystalline features with enhanced fluxion in porous architectures lead to outstanding performance without visible degradation even after continuous operation for 100 hours.