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Nanophase-separated Ni3Nb as an automobile exhaust catalyst
- Source :
- Chemical Science. 8:3374-3378
- Publication Year :
- 2017
- Publisher :
- Royal Society of Chemistry (RSC), 2017.
-
Abstract
- Catalytic remediation of automobile exhaust has relied on precious metals (PMs) including platinum (Pt). Herein, we report that an intermetallic phase of Ni and niobium (Nb) (i.e., Ni3Nb) exhibits a significantly higher activity than that of Pt for the remediation of the most toxic gas in exhaust (i.e., nitrogen monoxide (NO)) in the presence of carbon monoxide (CO). When subjected to the exhaust-remediation atmosphere, Ni3Nb spontaneously evolves into a catalytically active nanophase-separated structure consisting of filamentous Ni networks (thickness < 10 nm) that are incorporated in a niobium oxide matrix (i.e., NbOx (x < 5/2)). The exposure of the filamentous Ni promotes NO dissociation, CO oxidation and N2 generation, and the NbOx matrix absorbs excessive nitrogen adatoms to retain the active Ni0 sites at the metal/oxide interface. Furthermore, the NbOx matrix immobilizes the filamentous Ni at elevated temperatures to produce long-term and stable catalytic performance over hundreds of hours.
- Subjects :
- Materials science
Inorganic chemistry
Niobium
Oxide
Intermetallic
chemistry.chemical_element
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Catalysis
Metal
chemistry.chemical_compound
chemistry
visual_art
visual_art.visual_art_medium
Niobium oxide
0210 nano-technology
Platinum
Carbon monoxide
Subjects
Details
- ISSN :
- 20416539 and 20416520
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Chemical Science
- Accession number :
- edsair.doi...........4be8f2a670737e10915d87dbba67b5a5