Journal
APPLIED SURFACE SCIENCE
Volume 423, Issue -, Pages 771-779Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.06.235
Keywords
MOFs; CeO2; Calcination temperature; CO oxidation; Oxygen vacancies; Surface Ce3+ ions
Categories
Funding
- National Natural Science Foundation of China [21507086, 51508327, 41673093]
- Shanghai Sailing Program [14YF1409900, 16YF1408100]
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The paper presents a novel and facile method for preparing cauliflowerlike CeO2 through direct decomposition of cerium based metal-organic framework (MOF) Ce-BTC (BTC = 1,3,5-benzenetricarboxylic acid) straw in air. Several analytical tools such as Scanning electron microscopy (SEM), X-ray diffraction (XRD), Thermogravimetric (TG), N-2 adsorption-desorption, Temperature programmed reduction (TPR), Raman, X-ray photoelectron spectroscopic (XPS) and Photoluminescence (PL) have been used to characterize Ce-BTC and CeO2. The Ce-BTC calcined at 500 degrees C (CeO2-500) maintains the morphology of its template Ce-BTC and forms a special cauliflower-like structure. XRD patterns showed that the catalyst has a perfect CeO2 crystal structure and has a smaller particle size. The prepared CeO2 cauliflowers exhibit excellent catalytic activities, long-term stability, and cycling stability for CO oxidation. The improved catalytic activities could be attributed to porous nanorods of CeO2 cauliflowers, which provide more active sites and oxygen vacancy for CO oxidation. (C) 2017 Elsevier B.V. All rights reserved.
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