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A platelet-like CeO2 mesocrystal enclosed by {100} facets: synthesis and catalytic properties

  • Wei Deng
  • Xingyi Wang
  • Feng Jiao
  • Kake Zhu
Research Paper

Abstract

Platelet-like CeO2 mesocrystals, constituted of 4–5 nm fused nanoparticles with interparticular voids along a common [002] axis, have successfully been synthesized through a benzyl alcohol-assisted solvothermal synthesis, followed by a topotactical transformation at 400 °C. The resulting CeO2 mesocrystal superstructure is enclosed by Tasker III type {100} facets. H2-TPR suggested that the as-made CeO2 mesocrystal surfaces are covered by reactive oxygen vacancies. Such oxygen vacancies can activate oxygen at low temperatures (<200 °C), and thereby catalyze CO and benzene oxidation effectively. Remarkably, the CO oxidation activity of CeO2 mesocrystal is 220 % as high as the traditional nanoparticle sample and a reaction rate of 0.53 μmol g cat −1  s−1 for CeO2 mesocrystal at 160 °C has been achieved. Such a rate is even higher than the best value reported previously (0.51 μmol g cat −1  s−1 for CeO2 nanorods). A similar superior catalytic property of CeO2 mesocrystals was also observed in the catalytic oxidation of more recalcitrant benzene.

Graphical Abstract

The formation scheme of mesocrystal CeO2 enclosed by Tasker III type {100} facets and the corresponding catalytic CO oxidation activity.

Keywords

CeO2 Mesocrystal Tasker III surface CO oxidation Benzene oxidation 

Notes

Acknowledgments

KZ is grateful for the financial support from National Natural Science Foundation of China (21006024), CNPC Innovation Foundation (2011D-5006-0507), Shanghai Pujiang Program (11PJ1402600), and New Century Excellent Talents in University (NCET-11-0644).

Supplementary material

11051_2013_1944_MOESM1_ESM.doc (4.6 mb)
Supplementary material 1 (DOC 4761 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Key Lab for Advanced Materials, Research Institute of Industrial CatalysisEast China University of Science and TechnologyShanghaiPeople’s Republic of China
  2. 2.Department of Chemical and Biomolecular EngineeringUniversity of DelawareNewarkUSA
  3. 3.UNILAB, State Key Lab of Chemical Engineering, School of Chemical EngineeringEast China University of Science and TechnologyShanghaiPeople’s Republic of China

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