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- Title
Large Dimensional CeO<sub>2</sub> Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity.
- Authors
Ding, Huihui; Ma, Shuyi; Xu, Jingli; Wang, JinJie; Yang, Jingxia; Yigit, Nevzat; Rupprechter, Günther
- Abstract
Abstract: Large nano‐structured flakes of CeO2 (20–80 nm in thickness, up to 5.6 μm in diameter) were synthesized by a combination of microwave (MW), ultraviolet (UV) and ultrasound (US), with or without pressure (P). The CeO2 structures were systematically examined by XRD, SEM, N2 sorption, HRTEM, XPS, Raman and H2‐TPR. The synthesized CeO2 nanoflakes were composed by 3.0–7.5 nm nanoparticles with the (111) surface exposed, and laminated to nanoflakes with 3.42–3.85 nm nano‐channels in between. MW‐assisting was beneficial to form a higher surface Ce3+/(Ce3++Ce4+) ratio and surface oxygen vacancies during short synthesis procedure. A Raman peak at 480 cm−1 correlating with bulk Ce3+ was detected. H2‐TPR found MW and MW+P had more surface Ce3+ (surface oxygen vacancies). CO oxidation and imine conversion proved that MW+P was the optimum condition to produce highly active CeO2 nanoflakes. The much better catalytic performance than CeO2 from solvothermal preparation, due to the larger channel gap (3.85 nm),a higher Ce3+/(Ce3++Ce4+) ratio (32 %) and more surface oxygen vacancies on the particles of the organized flake structures.
- Subjects
CERIUM oxides; METHANOL; ULTRAVIOLET radiation; X-ray diffraction; SCANNING electron microscopy
- Publication
ChemCatChem, 2018, Vol 10, Issue 18, p4100
- ISSN
1867-3880
- Publication type
Article
- DOI
10.1002/cctc.201800784