Carbon nanofiber supports for the preparation of Pt-based metal nanoparticles with high tolerance to sintering
Carbon nanofiber supports for the preparation of Pt-based metal nanoparticles with high tolerance to sintering
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DOI：
10.1016/j.apcata.2012.10.015
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发表时间：
2013-01
影响因子：
5.5
通讯作者：
S. Takenaka;A. Iga;Kayoung Park;E. Tanabe;H. Matsune;M. Kishida
中科院分区：
文献类型：
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作者：
S. Takenaka;A. Iga;Kayoung Park;E. Tanabe;H. Matsune;M. Kishida
鱼骨型碳纳米纤维（CNFs）是由甲烷在二氧化硅负载的Ni催化剂上分解形成的，用作Pt或Pt - co合金纳米颗粒的催化载体。用浓hno3处理CNFs导致多孔结构的形成以及含氧官能团的引入。经hno3处理的CNFs表面可以稳定得到直径为几纳米的Pt金属颗粒，并表现出较高的高温烧结耐受性，而未经处理的CNFs表面负载的Pt金属颗粒在高温下聚集严重。CNFs中的多孔结构和官能团作为Pt金属纳米颗粒的锚定位点。因此，使用CNF载体可以制备直径几纳米的Pt-Co合金颗粒，因为CNF在高温处理过程中抑制了合金颗粒的烧结，从而允许合金的形成。
Fishbone-typed carbon nanofibers (CNFs) that were formed by methane decomposition over silica-supported Ni catalysts were used as catalytic supports for Pt or Pt–Co alloy nanoparticles. The treatment of CNFs with concentrated HNO3led to the formation of porous structures as well as to the introduction of oxygen-containing functional groups. Pt metal particles of a few nanometers in diameter could be stabilized on the CNFs treated with HNO3and showed a high tolerance to sintering at high temperatures, whereas Pt metal particles supported on the CNFs without any treatment were seriously aggregated at high temperatures. The porous structures and functional groups in the CNFs worked as anchoring sites for Pt metal nanoparticles. Thus, Pt–Co alloy particles of a few nanometers in diameter could be prepared by using the CNF support since the CNFs inhibited the sintering of the alloy particles during the treatment at high temperatures to allow for alloy formation.