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论文类型：期刊论文

发表时间：2015-03-01

发表刊物：CHEMCATCHEM

收录刊物：SCIE、EI、Scopus

卷号：7

期号：6

页面范围：978-983

ISSN号：1867-3880

关键字：aluminum; hydrogenation; intermetallic compounds; nickel; wet chemistry

摘要：Selective hydrogenation of naphthalene to tetralin was conducted by using Ni-Al intermetallic compounds (IMCs) prepared by a chemical synthetic route. Ni-Al IMC catalysts achieved a lasting high conversion with 100% selectivity up to 125h. During the synthesis process, the Ni-Al IMCs underwent the following phase transformation as a function of the content of the Al source (LiAlH4): Ni(cubic)Ni3Al(tetragonal)NiAl(cubic)Ni2Al3(hexagonal). In the selective hydrogenation of naphthalene, the catalytic activity of NiAl was much higher than that of metallic Ni and other Ni-Al IMCs (Ni3Al and Ni2Al3). The results can be understood by a combination of site isolation and alteration of the electronic structure by chemical bonding. Ni atoms are scattered and spatially isolated by Al atoms, which in turn resists carbon deposition. The findings provide a useful approach to tailor the catalytic properties of transition metals by formation of IMCs, which could be applicable in heterogeneous catalysis.