Abstract
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 oC 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.
Highlights
Supported metal single atom catalysts (SACs) present an emerging class of low-temperature catalysts with high reactivity and selectivity, which, face challenges on both durability and practicality
The exemplary catalytic devices range from diesel oxidation catalysts (DOCs)[1,2], three-way catalysts (TWCs)[3], selective catalytic reduction (SCR) of nitrogen oxides (NOx) catalysts[4], to lean NOx traps (LNT)[5]
There has yet to be an evaluation of SACs in field-size catalytic reactors under realistic exhaust conditions, such a real-world demonstration is necessary to translate the scientific advancement to technological applications
Summary
Supported metal single atom catalysts (SACs) present an emerging class of low-temperature catalysts with high reactivity and selectivity, which, face challenges on both durability and practicality. Such a NA supported Pt SAC retains its nanowire array structure as well as abundant Pt single-atom species on the TiO2 nanowire surfaces after the hydrothermal aging and simulated exhaust test.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
