A General Synthetic Approach for Integrated Nanocatalysts
Integration of different nanocomponents into a greater assemblage or object for applications poses a significant challenge to nanotechnology. At present, it still remains extremely difficult to achieve high monodispersivity for such assembled products. To gain better synthetic controllability, ideally, an integration of this type should be done in a stepwise manner. In this project, we developed a versatile stepwise approach for preparation of integrated nanocatalysts of metal-mSiO2@ZIFs (mSiO2 = mesoporous silica, and ZIFs = ZIF-8 and ZIF-67). Starting with Stöber silica beads, mesoporous silica channels can be created with desired length and diameter. Ultrafine metal nanoparticles can then be deposited evenly onto the inner walls of silica channels. Through coordination interaction between polyvinylpyrrolidone and unsaturated Zn2+ ions exposed on the ZIF-8 shell, uniform metal-mSiO2@ZIF-8 spheres with desired shape and size can be obtained. The workability of these catalysts is demonstrated with hydrogenation of different alkenes using as-produced Pd-mSiO2@ZIF-8 catalyst.
This work has been published in Chemistry of Materials on January 12, 2016 (DOI: 10.1021/acs.chemmater.5b04147)
Corresponding author(s): Hua Chun Zeng (
Corresponding author(s) webpage: http://cheed.nus.edu.sg/stf/chezhc/000731zenghc.html