A dynamic structural behavior of Pt nanoparticles on the ceria surface under reducing/oxidizing conditions was found at moderate temperatures (<500 °C) and exploited to enhance the catalytic activity of Pt/CeO2‐based exhaust gas catalysts. Red...
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https://www.riss.kr/link?id=O120445947
2017년
-
0044-8249
1521-3757
학술저널
13258-13262 [※수록면이 p5 이하이면, Review, Columns, Editor's Note, Abstract 등일 경우가 있습니다.]
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
A dynamic structural behavior of Pt nanoparticles on the ceria surface under reducing/oxidizing conditions was found at moderate temperatures (<500 °C) and exploited to enhance the catalytic activity of Pt/CeO2‐based exhaust gas catalysts. Red...
A dynamic structural behavior of Pt nanoparticles on the ceria surface under reducing/oxidizing conditions was found at moderate temperatures (<500 °C) and exploited to enhance the catalytic activity of Pt/CeO2‐based exhaust gas catalysts. Redispersion of platinum in an oxidizing atmosphere already occurred at 400 °C. A protocol with reducing pulses at 250–400 °C was applied in a subsequent step for controlled Pt‐particle formation. Operando X‐ray absorption spectroscopy unraveled the different extent of reduction and sintering of Pt particles: The choice of the reductant allowed the tuning of the reduction degree/particle size and thus the catalytic activity (CO>H2>C3H6). This dynamic nature of Pt on ceria at such low temperatures (250–500 °C) was additionally confirmed by in situ environmental transmission electron microscopy. A general concept is proposed to adjust the noble metal dispersion (size, structure), for example, during operation of an exhaust gas catalyst.
Unter Kontrolle: Die katalytische Aktivität von Diesel‐Oxidationskatalysatoren bei niedriger Temperatur wurde durch Aufklärung des dynamischen Strukturverhaltens von Pt‐Nanopartikeln auf Ceroxid durch Operando‐XAS und ETEM erhöht. Hieraus wurde ein allgemeines Konzept abgeleitet, um die Größe und Struktur von Edelmetallpartikeln auf stark wechselwirkenden Trägermaterialien während des Betriebs unter realen Bedingungen gezielt einzustellen.
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