Restructuring of supported metal nanoparticles (NPs) e.g., reshaping and redispersion are of tremendous interest for the rational {design|style|design and style} of high-efficiency catalyst {materials|supplies|components} with precise particle sizes, shapes, and reactivities. {Here|Right here} we show a crystal phase mediated restructuring of Pt NPs on TiO2, as a {simple|easy|straightforward|basic|uncomplicated|very simple} {approach|method|strategy} for fabricating either atomically dispersed single atoms (SAs) or reshaped planar NPs of Pt catalysts with tunable reactivities. {Utilizing|Using} {a variety of|a number of|many different|various|a range of|several different} state-of-the-art characterizations, we showed that rutile TiO2 favors the reshaping of 2D planar Pt NPs, whereas the anatase surface facilitates the redispersion of Pt NPs to SAs upon calcination {in the|within the|inside the} air {up to|as much as} 400 ºC. Environmental transmission electron microscopy (ETEM) and density function theory (DFT) calculations {were|had been|have been} employed to {directly|straight} visualize the dynamic transformation of Pt NPs and reveal the {specific|particular|certain|distinct|precise} {role|function|part} that TiO2 supports play in {promoting|advertising} the stability and diffusion of Pt SAs. {As a result|Consequently|Because of this}, the reverse reactivity was {achieved|accomplished} by tunning their distinct restructuring behaviors. {Thus|Therefore|Hence|As a result}, the Pt SAs on anatase TiO2 preferentially activated selective hydrogenation of phenylacetylene (21.22 x 10-2 s-1 at 50 ºC), {while|whilst|although|even though|when|though} planar Pt NPs on rutile {significantly|considerably|substantially|drastically} enhanced the combustion of methane ({3|three}.11 x 10-2 s-1 at 310 ºC). Our {results|outcomes|final results|benefits} {therefore|consequently|as a result|for that reason|thus|hence} open up new routes for tuning the restructuring behavior of supported metal catalysts and designing catalysts with controlled catalytic structures and reactivities. 201286-95-5 uses 4-Amino-1H-pyrazole-3-carbonitrile Order PMID:23399686
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