Size Regulation and Stability Enhancement of Pt Nanoparticle Catalyst via Polypyrrole Functionalization of Carbon-Nanotube-Supported Pt Tetranuclear Complex

作者：Muratsugu Satoshi^*; Miyamoto Shota; Sakamoto Kana; Ichihashi Kentaro; Kim Chang Kyu; Ishiguro Nozomu; Tada Mizuki^*

来源：Langmuir, 2017, 33(39): 10271-10282.

DOI：10.1021/acs.langmuir.7b02114

A novel multiwall carbon nanotube (MWCNT) and polypyrrole (PPy) composite was found to be useful for preparing durable Pt nanoparticle catalysts of highly regulated sizes. A new pyrene-functionalized Pt-4 complex was attached to the MWCNT surface which was functionalized with PPy matrix to yield Pt-4 complex/PPy/MWCNT composites without decomposition of the Pt-4 complex units. The attached Pt-4 complexes in the composite were transformed into Pt nanoparticles with sizes of 1.0-1.3 nm at a Pt loading range of 2 to 4 wt %. The Pt nanoparticles in the composites were found to be active and durable catalysts for the N-alkylation of aniline with benzyl alcohol. In particular, the Pt nanoparticles with PPy matrix exhibited high catalyst durability in up to four repetitions of the catalyst recycling experiment compared with nonsize-regulated Pt nanoparticles prepared without PPy matrix. These results demonstrate that the PPy matrix act to regulate the size of Pt nanoparticles, and the PPy matrix also offers stability for repeated usage for Pt nanoparticle catalysis.

• 出版日期2017-10-3