Graphene stabilized ultra-small CuNi nanocomposite with high activity and recyclability toward catalysing the reduction of aromatic nitro-compounds
Graphene stabilized ultra-small CuNi nanocomposite with high activity and recyclability toward catalysing the reduction of aromatic nitro-compounds
复制标题
石墨烯稳定的超小CuNi纳米复合材料具有高活性和可回收性，可催化芳香硝基化合物的还原
DOI：
10.1039/c5nr05016b
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发表时间：
2016
期刊：
影响因子：
6.7
通讯作者：
Li Weiying
中科院分区：
文献类型：
--
作者：
Fang Hao;Wen Ming;Chen Hanxing;Wu Qingsheng;Li Weiying
目前，设计一种无贵金属、高活性、长寿命的催化剂用于芳香硝基化合物的还原具有重要意义和挑战性。在此，制备了具有石墨烯负载的CuNi合金纳米颗粒（NPs）的2D结构的纳米复合催化剂，并且有望满足绿色化学的要求。在石墨烯/CuNi纳米复合材料中，CuNi纳米粒子（~ 2nm）均匀地锚定在石墨烯片上，这不仅是结构上的突破，而且在活性和稳定性方面也表现出优异的性能。结合合金比例的精确优化，石墨烯/Cu 61 Ni 39的反应速率常数达到了0.13685 s-1的高水平，对各种芳香族硝基化合物的选择性高达99%。更重要的是，该催化剂表现出前所未有的长寿命，因为它可以重复使用超过25次，而没有明显的性能衰减甚至形态变化。这一工作表明了无贵金属催化剂在绿色化学中的前景和巨大潜力。
Nowadays, it is of great significance and a challenge to design a noble-metal-free catalyst with high activity and a long lifetime for the reduction of aromatic nitro-compounds. Here, a 2D structured nanocomposite catalyst with graphene supported CuNi alloy nanoparticles (NPs) is prepared, and is promising for meeting the requirements of green chemistry. In this graphene/CuNi nanocomposite, the ultra-small CuNi nanoparticles (∼2 nm) are evenly anchored on graphene sheets, which is not only a breakthrough in the structures, but also brings about an outstanding performance in activity and stability. Combined with a precise optimization of the alloy ratios, the reaction rate constant of graphene/Cu61Ni39 reached a high level of 0.13685 s−1, with a desirable selectivity as high as 99% for various aromatic nitro-compounds. What's more, the catalyst exhibited a unprecedented long lifetime because it could be recycled over 25 times without obvious performance decay or even a morphology change. This work showed the promise and great potential of noble-metal-free catalysts in green chemistry.