Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 250, Issue -, Pages 132-142Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2019.03.019
Keywords
Co3O4; Ag/CeO2; Soot oxidation; NO oxidation; Tandem oxygen delivery
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, CAST [2018QNRC001]
- Postdoctoral Science Foundation of Shandong Province [201601009]
- Qingdao City Programs for Science and Technology Plan Projects [18-2-2-2-jc]
- Fundamental Research Funds for the Central Universities [201861050]
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In this work, tandem oxygen delivery systems were built by coating cube-like Co3O4 with Ag/CeO2, which exhibited high soot oxidation activity that overwhelmed the Fe2O3-based catalysts. The results of TPR and activity tests indicated that a large amount of Co3O4 lattice oxygen could be transferred into O-x(-) with the assistance of Ag/CeO2. These active oxygen species accelerated the oxidation of soot and NO at low temperature. Furthermore, the Co3O4-CeO2 synergy facilitated Co3+ -> Co2+ transformation during reactions, resulting in boosted NO conversion and thereby NO2-assisted soot combustion at mild and high temperatures. Given the Ag/Co3O4@CeO2-type catalysts were low-cost, hydrothermally stable and could be fabricated via co-precipitation methods easily, they were highly promising for application in both gasoline and diesel particulate filters.
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