Cooperative effect of Pt single-atoms and nanoparticles supported on carbonaceous materials: Catalytic NO decomposition as a probe reaction.
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| Title: | Cooperative effect of Pt single-atoms and nanoparticles supported on carbonaceous materials: Catalytic NO decomposition as a probe reaction. |
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| Authors: | Granger, Pascal1 (AUTHOR) pascal.granger@univ-lille.fr, Wu, Jianxiong1 (AUTHOR), Ba, Housseinou2 (AUTHOR), Baaziz, Walid3 (AUTHOR), Ersen, Ovidiu3 (AUTHOR), Zafeiratos, Spyridon2 (AUTHOR), Nhut, Jean-Mario2 (AUTHOR), Giambastiani, Giuliano1,2,4 (AUTHOR) giambastiani@unistra.fr, Pham-Huu, Cuong1,2 (AUTHOR) cuong.pham-huu@unista.fr |
| Source: | Applied Catalysis A: General. May2021, Vol. 617, pN.PAG-N.PAG. 1p. |
| Subjects: | Platinum nanoparticles, Chemical decomposition, Metal nanoparticles, Sonochemistry, Activated carbon, Thermal resistance, Catalyst poisoning |
| Abstract: | [Display omitted] • Simple sonochemistry route to prepare single Pt atoms anchored on carbonaceous materials. • Unexpected NO decomposition on single Pt atoms related to weak O-inhibiting effect. • New mechanistic insights in NO decomposition: from nanoparticles to single atoms • High thermal resistance of single Pt atoms up to 650 °C in wet conditions Activated carbon containing highly dispersed platinum (Pt/C with ca. 1 wt.%) catalyst was synthesized according to the simple sonochemistry route followed by a drying step in air at 130 °C. STEM-HAADF micrographs indicate the presence of Pt single atoms (SAs) homogeneously dispersed on the activated carbon. The catalytic decomposition of NO has been investigated on samples pre-reduced at 250 °C and 500 °C. The Pt SAs remain stable and exhibit a surprisingly high activity which does not reflect the usually observed structure-sensitivity of NO dissociation. In addition, remarkable catalyst stability is observed after reaction at 650 °C in the presence of water. On the other hand, pre-reduction at 500 °C induces a strong deactivation related to a coalescence process with the subsequent generation of large Pt clusters, despite some small metal nanoparticles are still present in the sample. Accordingly, the structure-sensitivity of this reaction is restored. All these observations have been rationalized through the examinations of various reaction mechanisms. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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