Ceria-based nanoflake arrays integrated on 3D cordierite honeycombs for efficient low-temperature diesel oxidation catalyst

Journal Article · Thu Jan 10 00:00:00 EST 2019 · Applied Catalysis B: Environmental

DOI:https://doi.org/10.1016/j.apcatb.2019.01.028· OSTI ID:1529077

Tang, Wenxiang ^[1]; Lu, Xingxu ^[1]; Liu, Fangyuan ^[1]; Du, Shoucheng ^[1]; Weng, Junfei ^[1]; Hoang, Son ^[1]; Wang, Sibo ^[1]; Nam, Chang -Yong  ^[2]; Gao, Pu -Xian ^[1]

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1. Univ. of Connecticut, Storrs, CT (United States)
2. Brookhaven National Lab. (BNL), Upton, NY (United States)

A new, surfactant-free hydrothermal method has been developed for the growth of CeO₂-based nanoflake arrays onto three-dimensional-channeled cordierite honeycomb substrates. Herein, a leaching-crystallization mechanism was proposed where the hydrothermal reaction, only involving cerium nitrate and water, leached the cordierite surface slightly and induced the formation of CeO₂ nanoparticles subsequently. Further continued reaction reincorporated Al and Si atoms leached from cordierite into CeO₂, finally recrystallizing Ce-Al-Si composite nanoflake structures. Here, by using atomic layer deposition process, well-dispersed, size-controlled Pt nanoparticles were uniformly decorated on the CeO₂-based nanoflakes to form the Pt/ CeO₂ nano-array-based monolithic catalyst. Despite 5-50 times reduction in the active material usage compared with the traditional wash-coated catalyst, the Pt/CeO₂ nano-array monolithic catalyst exhibited good catalytic oxidation activities over various individual gases, such as propylene, propane, CO, and NO oxidation, with 90% conversion efficiencies at temperatures below 200 °C. Under the simulated exhaust condition of low-temperature diesel combustion (LTC-D) developed by US DRIVE, the monolithic catalyst with low Pt loading (˜1 g/l) exhibits 90% conversion of catalytic oxidation over CO and hydrocarbonsat temperatures as low as ˜180 °C, much superior to the performance of traditional washcoated catalysts.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0012704
• OSTI ID: 1529077
• Report Number(s): BNL-211788-2019-JAAM
• Journal Information: Applied Catalysis B: Environmental, Vol. 245, Issue C; ISSN 0926-3373
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CeO2
Nano-flake array
Monolithic catalyst
Pt nanoparticles
Low-Temperature diesel oxidation catalyst