The supported metal catalyst plays a very important role in the entire industrial catalytic field. However, as a supported metal catalyst, the support material plays an important role in the catalytic performance of the active metal nanoparticles. The carrier of the catalyst can influence the dispersion of the metal nanoparticles on the surface thereof, the size of the particle size, the exposed crystal plane, and the like. At the same time, by adjusting the interaction between the carrier and the metal nano-particles, the catalytic activity, selectivity and stability of the metal nano-particles can also be improved, thereby further improving the use efficiency and recycling ability of the metal nano-particles. Therefore, the pursuit and preparation of catalytic carrier materials with special properties has always been one of the hot topics in the field of catalysis.
Recently, the research team led by Su Duansheng and associate researcher Liu Hongyang, researcher of the Catalysis Materials Research Department of Shenyang National Institute of Materials Science, Chinese Academy of Sciences Institute of Metals, for the first time used graphene and nanodiamond composite core-shell structural materials (ND@G). A high performance palladium/carbon (Pd/C) catalyst was prepared for the support. When this Pd/C catalyst was used to catalyze the oxidation of CO, it was found that the ND@G supported palladium nanocatalyst (Pd/ND@G) compared to the supported Pd nanocatalyst on traditional sp2 hybridized onion carbon (OLC). Shows more excellent catalyst performance (Figure 1).
High-resolution transmission electron microscopy, spherical aberration-resolved high-angle annular darkfield-scanning transmission electron microscope and synchrotron radiation X-ray absorption fine structure spectra were used to characterize the catalyst. It was found that compared with the traditional carbon carriers, due to the rich graphene defect on the surface of the ND@G support, the interaction between the Pd nanoparticles and the nanocarbon support can be enhanced, thereby changing the geometry and structure of the Pd nanoparticles. Figure 2) and can significantly improve the sintering resistance of Pd nanoparticles on the carbon support surface (Figure 3). At the same time, it was also found that the strong metal-support interactions of these Pd/ND@G catalysts and the special geometry of Pd nanoparticles can significantly reduce the adsorption of CO molecules on the surface of Pd nanoparticles (Figure 4), which in turn promotes O2. The adsorption and dissociation of the Pd nanoparticles in the molecule enhances the ability of the catalyst to catalyze CO oxidation at low temperatures. This work provides a new idea for the design and synthesis of high performance nano-carbon supported metal catalysts. The work was published online in the form of an alert on Angewandte Chemie International Edition (DOI: 10.1002/anie.201507821).
In recent years, the Catalytic Materials Research Division has made progress in improving the catalytic performance of nanocarbon-supported metal catalysts by regulating the structure and properties of nanocarbon carriers, and related work was published in Angewandte Chemie International Edition (2014, 53, 12634-12638), ChemCatChem. (2014, 6, 2600-2606), Small (2015, 11, 5059-5064), Catalysis Today (2016, 260, 55–59) and other international academic journals.
The above work received the “973†project of the National Key Basic Research Development Program, the National Fund Committee Youth Fund, the National Fund Project, the National Fund Committee's Major Research Plan, the National Fund Committee Key Project, the Chinese Academy of Sciences Strategic Pilot Project, and the Sinopec Enterprise Project. Funding and strong support provided by Shanghai Synchrotron Radiation Source X-ray Absorption Fine Structure Line Station BL14W1.
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