A library of carbon-supported ultrasmall bimetallic nanoparticles
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A library of carbon-supported ultrasmall bimetallic nanoparticles Shi-Long Xu1, Shan-Cheng Shen1, Ze-Yue Wei2, Shuai Zhao1, Lu-Jie Zuo1, Ming-Xi Chen1, Lei Wang1, Yan-Wei Ding1, Ping Chen3, Sheng-Qi Chu4, Yue Lin1 (), Kun Qian2 (), and Hai-Wei Liang1 () 1
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China 2 Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 3 School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China 4 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 1 January 2020 / Revised: 2 June 2020 / Accepted: 6 June 2020
ABSTRACT Small-sized bimetallic nanoparticles that possess numerous accessible metal sites and optimal geometric/electronic structures show great promise for advanced synergetic catalysis but remain synthetic challenge so far. Here, an universial synthetic method is developed for building a library of bimetallic nanoparticles on mesoporous sulfur-doped carbon supports, consisting of 24 combinations of 3 noble metals (that is, Pt, Rh, Ir) and 7 other metals, with average particle sizes ranging from 0.7 to 1.4 nm. The synthetic strategy is based on the strong metal-support interaction arising from the metal-sulfur bonding, which suppresses the metal aggregation during the H2-reduction at 700 °C and ensure the formation of small-sized and alloyed bimetallic nanoparticles. The enhanced catalytic properties of the ultrasmall bimetallic nanoparticles are demonstrated in the dehydrogenation of propane at high temperature and oxidative dehydrogenations of N-heterocycles.
KEYWORDS bimetallic nanoparticles, sulfur doped carbon, catalysis, ultrasmall, metal-support interaction
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Introduction
Bimetallic nanoparticles (NPs), especially alloying noble metals with low-cost transition metals, have attracted considerable attentions due to their widespread applications in heterogeneous catalysis [1, 2]. Compared to their monometallic counterparts, bimetallic NPs frequently show unprecedented catalytic performance, which derives from the distinct ensemble and electronic structures induced by alloying as well as the synergistic effects between two metal elements [3]. Meanwhile, highly dispersed metals on high surface areas supports recently emerged as a novel high-performance catalysts that include ultrafine monometallic NPs and even atomically dispersed metals [4–7]. These materials show remarkable catalytic performance with the decrease of metal particle size, which are related to their extremely high dispersibility on supports with maximized metal atom utili
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