Journal
CHEMICAL ENGINEERING JOURNAL
Volume 375, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.121961
Keywords
Ag/CeO2; O-3 activation; Soot combustion; O-x(-) species; Surface oxygen vacancies
Categories
Funding
- National Key R&D Program of China [2017YFC0211202]
- National Natural Science Foundation of China [51702304]
- Natural Science Foundation of Shandong Province [ZR2017BEM006]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- Postdoctoral Science Foundation of Shandong Province [201601009]
- Qingdao City Programs for Science and Technology Plan Projects [18-2-2-2-jch]
- Fundamental Research Funds for the Central Universities
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In this work, O-3 activation was performed at 200 degrees C over two types of Ag/CeO2 catalysts with nanocube- and nanorod-like morphologies, respectively. The O-3-indcued surface O-x(-) species (O-x(-) injection) accelerated soot combustion over both catalysts temporarily. In contrast, the depletion of CeO2 surface oxygen vacancies (Ce3+-VO-s) caused by ozonization conferred to long-term activation. Specifically, the ozonized nanocubic Ag/CeO2 with low initial Ce3+ content not only benefited more from the O-x(-) injection, but also exhibited good redox stability and high practical potential. Therefore, the combination of this catalyst with O-3 activation may result in efficient soot elimination in the particulate filters of vehicles.
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