Activating low-temperature diesel oxidation by single-atom Pt on TiO2 nanowire array

• Published in: Nature communications Vol. 11; no. 1; pp. 1062 - 10
• Main Authors: Hoang, Son, Guo, Yanbing, Binder, Andrew J., Tang, Wenxiang, Wang, Sibo, Liu, Jingyue (Jimmy), Tran, Huan, Lu, Xingxu, Wang, Yu, Ding, Yong, Kyriakidou, Eleni A., Yang, Ji, Toops, Todd J., Pauly, Thomas R., Ramprasad, Rampi, Gao, Pu-Xian
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 26.02.2020; Nature Publishing Group; Nature Portfolio
• Subjects: 119/118; 140/146; 147/135; 147/137; 639/301/299/1013; 639/638/77/887; 639/925/357/1016; 704/172/169/896; Aging; Arrays; Automotive parts; Catalysts; Catalytic converters; Conversion; Cordierite; Diesel; Diesel engines; Durability; Emission control equipment; Exhaust systems; Honeycombs; Humanities and Social Sciences; Ions; Low temperature; MATERIALS SCIENCE; Metals; multidisciplinary; Nanotechnology; Nanowires; Oxidation; Oxygen ions; Platinum; Science; Science (multidisciplinary); Selectivity; Single atom catalysts; Sulfation; Temperature; Titanium; Titanium dioxide
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-020-14816-w

Supported metal single atom catalysts (SACs) present an emerging class of low-temperature catalysts with high reactivity and selectivity, which, however, face challenges on both durability and practicality. Herein, we report a single-atom Pt catalyst that is strongly anchored on a robust nanowire forest of mesoporous rutile titania grown on the channeled walls of full-size cordierite honeycombs. This Pt SAC exhibits remarkable activity for oxidation of CO and hydrocarbons with 90% conversion at temperatures as low as ~160 o C under simulated diesel exhaust conditions while using 5 times less Pt-group metals than a commercial oxidation catalyst. Such an excellent low-temperature performance is sustained over hydrothermal aging and sulfation as a result of highly dispersed and isolated active single Pt ions bonded at the Ti vacancy sites with 5 or 6 oxygen ions on titania nanowire surfaces. Supported metal single-atom catalysts face challenges on both durability and practicality. Here, the authors demonstrate that a sustained 90% diesel oxidation conversion at ~160 o C is achieved by single-atom Pt on TiO 2 nanowire-array integrated catalytic converter.