4.8 Article

Study of Ag promoted Fe2O3@CeO2 as superior soot oxidation catalysts: The role of Fe2O3 crystal plane and tandem oxygen delivery

期刊

APPLIED CATALYSIS B-ENVIRONMENTAL
卷 237, 期 -, 页码 251-262

出版社

ELSEVIER
DOI: 10.1016/j.apcatb.2018.05.093

关键词

Fe2O3; Ag/CeO2; Soot oxidation catalyst; Crystal plane; Tandem oxygen delivery

资金

  1. National Natural Science Foundation of China [51702304]
  2. Natural Science Foundation of Shandong Province [ZR2017BEM006]
  3. Postdoctoral Science Foundation of Shandong Province [201601009]
  4. China Science and Technology Exchange Center [2016YFE0126600]
  5. National Key R&D Program of China [2017YFC0211102, 2017YFC0211202]
  6. China Postdoctoral Science Foundation [2015M580607, 2017T100516]

向作者/读者索取更多资源

In this work, model alpha-Fe2O3 catalysts with different morphologies were synthesized to investigate crystal plane effects on soot oxidation. The results revealed that the electron-rich state of Fe2O3 {113} planes conferred them more surface O-x(-) and thus better catalytic performance than the {014} and {012} planes. Surface grafting of a polycrystalline CeO2 layer onto Fe2O3 gave rise to Fe2O3@CeO2 catalysts with drastically increased oxygen utilization. More importantly, by loading Ag nano-particles on the surface of Fe2O3@CeO2, a tandem oxygen delivery route was opened, resulting in strong O-x(-) generation/regeneration ability and superior low temperature soot oxidation activity. These Ag/Fe2O3@CeO2 catalysts overwhelmed the nano-cubic Ag/CeO2 in both catalyst cost and activity, making them very promising for application in catalyzed gasoline particulate filters (CGPFs).

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