Add time:08/14/2019         Source:sciencedirect.com

Designing and fabricating catalysts with highly dispersed metal nanoclusters (NCs) is very crucial for achieving high activity and selectivity. In this work, all-alkynyl-protected [Ag74(C≡CPh)44](NO3)2 cluster (Ag cluster) with a well-defined structure was firstly intercalated in α-zirconium phosphate (α-ZrP) through ion-exchange. Then the atomically precise Ag cluster can be immobilized robustly in the support by a sequential process of carbonization, calcination and reduction. The supported Ag cluster showed the relatively high catalytic activity (TOF=222.9-445.8 h−1) and excellent recyclability for hydrogenation of a variety of nitroaromatics, as well as the compounds with carbon-carbon double bonds even if the loading of Ag was as low as 0.72 wt.%. ZIRCONIUM PYROPHOSPHATE (cas 13565-97-4) acts as not only a stabilizer of Ag cluster through a spatial confinement, but also an adsorption site for nitroaromatics. The residual carbon arisen from thermal decomposition of all-alkynyl ligand coordinating on Ag cluster exerted an important role in protecting Ag cluster from sintering. As a result, the intercalation of Ag cluster in the interlayer region is a promising strategy for extending their potential applications in catalysis.

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