Yolk-shell nanocrystal@ZIF-8 nanostructures for gas-phase heterogeneous catalysis with selectivity control

Chun Hong Kuo, Yang Tang, Lien Yang Chou, Brian T. Sneed, Casey N. Brodsky, Zipeng Zhao, Chia Kuang Tsung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

565 Scopus citations


A general synthetic strategy for yolk-shell nanocrystal@ZIF-8 nanostructures has been developed. The yolk-shell nanostructures possess the functions of nanoparticle cores, microporous shells, and a cavity in between, which offer great potential in heterogeneous catalysis. The synthetic strategy involved first coating the nanocrystal cores with a layer of Cu 2O as the sacrificial template and then a layer of polycrystalline ZIF-8. The clean Cu 2O surface assists in the formation of the ZIF-8 coating layer and is etched off spontaneously and simultaneously during this process. The yolk-shell nanostructures were characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, and nitrogen adsorption. To study the catalytic behavior, hydrogenations of ethylene, cyclohexene, and cyclooctene as model reactions were carried out over the Pd@ZIF-8 catalysts. The microporous ZIF-8 shell provides excellent molecular-size selectivity. The results show high activity for the ethylene and cyclohexene hydrogenations but not in the cyclooctene hydrogenation. Different activation energies for cyclohexene hydrogenation were obtained for nanostructures with and without the cavity in between the core and the shell. This demonstrates the importance of controlling the cavity because of its influence on the catalysis.

Original languageEnglish
Pages (from-to)14345-14348
Number of pages4
JournalJournal of the American Chemical Society
Issue number35
StatePublished - 5 Sep 2012


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