Synthesis of nickel nanoparticles with excellent thermal stability in micropores of zeolite
Synthesis of nickel nanoparticles with excellent thermal stability in micropores of zeolite
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DOI：
10.1016/j.ijhydene.2013.08.027
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发表时间：
2013-10
影响因子：
7.2
通讯作者：
H. Inokawa;M. Maeda;S. Nishimoto;Y. Kameshima;M. Miyake;T. Ichikawa;Y. Kojima;H. Miyaoka
中科院分区：
文献类型：
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作者：
H. Inokawa;M. Maeda;S. Nishimoto;Y. Kameshima;M. Miyake;T. Ichikawa;Y. Kojima;H. Miyaoka
通过升华镍有机金属化合物 Ni(C5H5)2 的吸附和分解，在沸石微孔中合成镍 (Ni) 纳米颗粒，发明了纳米尺寸的金属催化剂，其尺寸小于 5 nm，并在高温下保持纳米尺寸。在分解过程中，Ni物质在紫外光照射下部分分解，并在氢气流下热还原之前固定在沸石孔隙中。请注意，Ni 纳米颗粒表现出优异的热稳定性，因为即使在 400 °C 加热后，它们仍保持直径小于 5 nm 的高分散性。另一方面，通过传统方法（即初湿浸渍工艺）负载在沸石上的 Ni 颗粒在相同温度下加热后变得大于 10 nm。合成的 Ni 纳米颗粒充当金属催化剂，因为它们在乙醇蒸汽重整反应中对 H2 生成的选择性高于对 C2H4 生成的选择性。
Nickel (Ni) nanoparticles were synthesized in micropores of zeolite by the adsorption and decomposition of a sublimated Ni organometallic compound, Ni(C5H5)2, to invent metallic catalysts with nanosize, which are smaller than 5 nm and keep the nanosize at high temperature. In the decomposition process, Ni species were partially decomposed by ultraviolet light irradiation and fixed in zeolite pores prior to thermal reduction under H2flow. Note that the Ni nanoparticles showed an excellent thermal stability, because they kept the high dispersion with diameters smaller than 5 nm even after heating at 400 °C. On the other hand, the Ni particles supported on zeolite by a conventional method, which is an incipient wetness impregnation process, became larger than 10 nm after heating at the same temperature. The synthesized Ni nanoparticles acted as a metallic catalyst because they showed higher selectivity for H2generation than C2H4generation during ethanol steam reforming reaction.