Low‐temperature Water‐gas Shift Reaction Enhanced by Oxygen Vacancies in Pt‐loaded Porous Single‐crystalline Oxide Monoliths. (25th August 2022)

• Record Type: Journal Article
• Authors: Xi, Shaobo; Zhang, Jie; Xie, Kui
• Is Part Of: Angewandte Chemie. Volume 134:Number 39(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-25
• Subjects: Oxygen Vacancy -- Porous Single Crystal -- Pt Clusters -- Interfaces -- Water-Gas Shift Reaction; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202209851
• Languages: English
• ISSNs: 0044-8249

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 H2 O is a critical reaction step that greatly limits the overall performance during WGS reaction. Here we fabricate porous single‐crystalline (PSC) MoO3 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 (VO ) at lattice and facilitates the effective activation of H2 O at the interface. We show the highest Pt‐normalized activity of 0.86 molCO molPt −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. Abstract : Here we create and stabilize oxygen vacancies in the Pt‐loaded porous single crystalline molybdenum oxide monolith and demonstrate efficient and durable low temperature water‐gas shift reaction.