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Dispersion and support dictated properties and activities of Pt/metal oxide catalysts in heterogeneous CO oxidation 被引量:1

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摘要 The source of activity of metal/metal oxides has always been an interesting,important but highly challenging research topic in heterogeneous catalysis.In CO oxidation reaction,this work clarifies dispersion and support dictated activities of Pt including single-atom(Pt1),2.8 nm(PtNP-S)and 36 nm(PtNP-L)Pt supported on both reducible TiO_(2) and“inert”Al_(2)O_(3) supports.The X-ray absorption fine structure(XAFS)shows that chemical state of Pt is affected by both dispersion and support:Pt1 presents fully oxidized state in both Pt1/TiO_(2) and Pt1/Al_(2)O_(3);PtNP-S in PtNP-S/TiO_(2) appear nearly oxidized state while about half of Pt is metallic state in PtNP-S/Al_(2)O_(3);PtNP-L in both PtNP-L/TiO_(2) and PtNP-L/Al_(2)O_(3) exhibit metallic state.All the Pt species supported on TiO_(2) present much lower apparent activation barriers(Eapp)than that on Al_(2)O_(3).Moreover,Pt1/TiO_(2) possesses dozen times of efficiency than PtNP-S/TiO_(2) although they have similar Eapp values.A truth is finally made clear that a reducible metal oxide with low oxygen vacancy formation energy is critical to endow Pt/metal oxide a high activity and the single-atom dispersion of Pt is the way to maximize the active sites of Pt/metal oxide.
出处 《Nano Research》 SCIE EI CSCD 2021年第12期4841-4847,共7页 纳米研究(英文版)
基金 This work was financially supported by the National Natural Science Foundation of China(Nos.21801003 and 21871005) the Natural Science Foundation of Anhui Province(No.1808085QB47) the University Synergy Innovation Program of Anhui Province(No.GXXT-2020-005) Fund for Outstanding Youth of Anhui Polytechnic University(Nos.2019JQ01 and 2016BJRC001).
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