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나노물질 및 화학반응 연구단
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Rare-earth-platinum alloy nanoparticles in mesoporous zeolite for catalysis

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Title
Rare-earth-platinum alloy nanoparticles in mesoporous zeolite for catalysis
Author(s)
Ryong Ryoo; Jaeheon Kim; Changbum Jo; Seung Won Han; Jeong-Chul Kim; Hongjun Park; Jongho Han; Hye Sun Shin; Jae Won Shin
Publication Date
2020-09
Journal
Nature, v.585, no.7824, pp.221 - 237
Publisher
Nature Publishing Group
Abstract
Platinum is a much used catalyst that, in petrochemical processes, is often alloyed with other metals to improve catalytic activity, selectivity and longevity1-5. Such catalysts are usually prepared in the form of metallic nanoparticles supported on porous solids, and their production involves reducing metal precursor compounds under a H-2 flow at high temperatures(6). The method works well when using easily reducible late transition metals, but Pt alloy formation with rare-earth elements through the H-2 reduction route is almost impossible owing to the low chemical potential of rare-earth element oxides(6). Here we use as support a mesoporous zeolite that has pore walls with surface framework defects (called `silanol nests') and show that the zeolite enables alloy formation between Pt and rare-earth elements. We find that the silanol nests enable the rare-earth elements to exist as single atomic species with a substantially higher chemical potential compared with that of the bulk oxide, making it possible for them to diffuse onto Pt. High-resolution transmission electron microscopy and hydrogen chemisorption measurements indicate that the resultant bimetallic nanoparticles supported on the mesoporous zeolite are intermetallic compounds, which we find to be stable, highly active and selective catalysts for the propane dehydrogenation reaction. When used with late transition metals, the same preparation strategy produces Pt alloy catalysts that incorporate an unusually large amount of the second metal and, in the case of the PtCo alloy, show high catalytic activity and selectivity in the preferential oxidation of carbon monoxide in H-2.
URI
https://pr.ibs.re.kr/handle/8788114/9205
DOI
10.1038/s41586-020-2671-4
ISSN
0028-0836
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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