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Zhang, Zailei; Zhu, Yihan; Asakura, Hiroyuki; Zhang, Bin; Zhang, Jiaguang; Zhou, Maoxiang; Han, Yu; Tanaka, Tsunehiro; Wang, Aiqin; Zhang, Tao; Yan, Ning
Nature communications, 07/2017, Volume: 8, Issue: 1Journal Article
Abstract Single-atom metal catalysts offer a promising way to utilize precious noble metal elements more effectively, provided that they are catalytically active and sufficiently stable. Herein, we report a synthetic strategy for Pt single-atom catalysts with outstanding stability in several reactions under demanding conditions. The Pt atoms are firmly anchored in the internal surface of mesoporous Al 2 O 3 , likely stabilized by coordinatively unsaturated pentahedral Al 3+ centres. The catalyst keeps its structural integrity and excellent performance for the selective hydrogenation of 1,3-butadiene after exposure to a reductive atmosphere at 200 °C for 24 h. Compared to commercial Pt nanoparticle catalyst on Al 2 O 3 and control samples, this system exhibits significantly enhanced stability and performance for n -hexane hydro-reforming at 550 °C for 48 h, although agglomeration of Pt single-atoms into clusters is observed after reaction. In CO oxidation, the Pt single-atom identity was fully maintained after 60 cycles between 100 and 400 °C over a one-month period.
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