Inverse single-site Fe1(OH)X/Pt(111) model catalyst for preferential oxidation of CO in H2
نویسندگان
چکیده
Abstract Inverse oxide/metal model systems are frequently used to investigate catalytic structure-function relationships at an atomic level. By means of a novel layer deposition process, growth single-site Fe 1 O x on Pt(111) single crystal surface was achieved, as confirmed by scanning tunneling microscopy (STM). The redox properties the catalyst were characterized synchrotron radiation based ambient pressure X-ray photoelectron spectroscopy (AP-XPS). After calcination treatment 373 K in mbar 2 chemical state determined 3+ . Reduction H demonstrates facile reduction 2+ and complete hydroxylation significantly lower temperatures than what has been reported for iron oxide nanoparticles. At reaction conditions relevant preferential oxidation CO (PROX), exhibits (ferric hydroxide) 298 while re-oxidation clusters does not occur under same condition. proceeds (OH) 3 through mechanism including loss hydroxyl groups temperature range 473 K, but no is observed clusters. results highlight high flexibility atom switching states, nanoparticles similar conditions, which may indicate higher intrinsic activity such interfacial sites conventional metal-oxide interfaces. In summary, our findings inverse provide new insights into applied Fe-Pt catalysis.
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ژورنال
عنوان ژورنال: Nano Research
سال: 2021
ISSN: ['1998-0000', '1998-0124']
DOI: https://doi.org/10.1007/s12274-021-3551-4