title: Stabilizing a Platinum1 Single-Atom Catalyst on Supported Phosphomolybdic Acid without Compromising Hydrogenation Activity.
abstract: In coordination chemistry, catalytically active metal complexes in a zero- or low-valent state often adopt four-coordinate square-planar or tetrahedral geometry. By applying this principle, we have developed a stable Pt1 single-atom catalyst with a high Pt loading (close to 1 wt %) on phosphomolybdic acid(PMA)-modified active carbon. This was achieved by anchoring Pt on the four-fold hollow sites on PMA. Each Pt atom is stabilized by four oxygen atoms in a distorted square-planar geometry, with Pt slightly protruding from the oxygen planar surface. Pt is positively charged, absorbs hydrogen easily, and exhibits excellent performance in the hydrogenation of nitrobenzene and cyclohexanone. It is likely that the system described here can be extended to a number of stable SACs with superior catalytic activities.
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang
authors.affiliation: Department of Molecular Engineering, Graduate School of Engineering; Japan and Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto, 615-8510; 615-8245, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Asakura
authors.affiliation: Institute of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way #16-16 Connexis, Singapore, 138632, Singapore.
authors.forename: Jia
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore.
authors.forename: Jiaguang
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore.
authors.forename: Sudipta
authors.initials: S
authors.lastname: De
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore. ning.yan@nus.edu.sg.
authors.forename: Ning
authors.identifier: 0000-0002-1877-9206
authors.initials: N
authors.lastname: Yan
keywords: four-fold hollow sites; heterogeneous catalysis; hydrogenation; phosphomolybdic acid; single-atom catalysts