Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 2, Pages 2860-2870Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c20965
Keywords
diesel oxidation catalyst; DOC; mullite-type catalyst; Mn-Ce redox cycle; NO oxidation
Funding
- National Natural Science Foundation of China [22022605]
- Taishan industry leading talent project
- Users with Excellence Program of Hefei Science Center CAS [2020HSC-UE002]
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This article presents a novel high-performance diesel oxidation catalyst (DOC) with high steam resistance and thermal stability. By modifying the surface physicochemical environment of CeO2-SmMn2O5, the catalyst exhibits excellent low-temperature oxidation catalytic activity and NO conversion.
A diesel oxidation catalyst (DOC) is installed upstream of an exhaust after-treatment line to remove CO and hydrocarbons and generate NO2. The catalyst should possess both good oxidation ability and thermal stability because it sits after the engine. We present a novel high-performance DOC with high steam resistance and thermal stability. A selective dissolution method is adopted to modify the surface physicochemical environment of CeO2-SmMn2O5. The X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, Raman, electron paramagnetic resonance, hydrogen temperature-programmed reduction, and temperature-programmed desorption results reveal that surface Sm cations are partially removed with the exposure of more Mn4+ and Ce3+ cations and the presence of active surface oxygen species. This mechanism benefits the oxygen transformation from Ce to Mn and promotes the Ce3+ + Mn4+ <-> Ce4+ + Mn3+ redox cycle according to the in situ near-ambient pressure X-ray photoelectron spectroscopy and in situ diffuse reflectance infrared Fourier transformation spectroscopy results. Under laboratory-simulated diesel combustion conditions, the catalyst demonstrates excellent low-temperature oxidation catalytic activity (CO and C3H6 conversion: T-100 = 250 degrees C) compared to a Pt-based catalyst (CO and C3H6 conversion: T-100 = 310 degrees C) with a WHSV of 120,000 mL g(-1) h(-1). Specifically, NO conversion reaches 68% when the temperature is approximately 300 degrees C.
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