Journal
ACS CATALYSIS
Volume 7, Issue 3, Pages 1583-1591Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b03109
Keywords
nanocatalysts; Pt-SnO2; hydrogenation; core@shell; nitroaromatics
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Funding
- programs of the Ningbo Municipal Science and Technology Innovative Research Team [2014B81004, 20161310005]
- National Natural Science Foundation of China [21571183, 91434110, 21676089]
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In this work, Pt-SnO2 heteroaggregate nano catalysts were synthesized by in situ transformation of Pt@Sn core-shell nanoparticles and their catalytic performance for hydrogenation of various substituted nitroaromatics was investigated. The Pt@Sn nanoparticles were prepared by a one-step method, and the alumina-supported Pt@Sn nano particles were further transformed in situ into Pt-SnO2 heteroaggregate nanostructures by calcination. The structures of Pt@Sn and Pt-SnO2 nanomaterials were characterized, and FT-IR with CO probes, HRTEM, XRD, and XPS characterizations revealed that the as-synthesized Pt@Sn nanoparticles were core@shell-like structures with Sn-rich shells and Pt-rich cores and the obtained Pt-SnO2 heteroaggregate nanostructures consisted of close-contact pure Pt and SnO2 phases. The Pt-SnO2/Al2O3 nanostructures demonstrated a better catalytic performance for hydrogenation of various substituted nitroaromatics relative to individual Pt/Al2O3 nanocatalysts. Theoretical calculations suggested that Pt-SnO2 nanocatalysts can slightly facilitate the adsorption of H-2 and o-chloronitrobenzene and strongly weaken the binding of Pt/o-chloroaniline, resulting in more available reactants and easier release of products from the catalyst surfaces. The theoretical calculations indicated that the enhanced catalytic performance may originate from a cooperative interaction between Pt and SnO2.
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