Synthesis of nickel nanoparticles with excellent thermal stability in micropores of zeolite

Hitoshi Inokawa, Makoto Maeda, Shunsuke Nishimoto, Yoshikazu Kameshima, Michihiro Miyake, Takayuki Ichikawa, Yoshitsugu Kojima, Hiroki Miyaoka

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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 H2 flow. 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 H2 generation than C2H4 generation during ethanol steam reforming reaction.

Original languageEnglish
Pages (from-to)13579-13586
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number31
DOIs
Publication statusPublished - Oct 17 2013

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Thermodynamic stability
thermal stability
Nickel
nickel
Nanoparticles
nanoparticles
synthesis
Nickel compounds
Decomposition
Heating
Catalysts
Catalyst selectivity
Steam reforming
decomposition
catalysts
Organometallics
organometallic compounds
Reforming reactions
heating
Impregnation

Keywords

  • Catalyst
  • Nanoparticle
  • Nickel
  • Nickelocene
  • Zeolite

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Synthesis of nickel nanoparticles with excellent thermal stability in micropores of zeolite. / Inokawa, Hitoshi; Maeda, Makoto; Nishimoto, Shunsuke; Kameshima, Yoshikazu; Miyake, Michihiro; Ichikawa, Takayuki; Kojima, Yoshitsugu; Miyaoka, Hiroki.

In: International Journal of Hydrogen Energy, Vol. 38, No. 31, 17.10.2013, p. 13579-13586.

Research output: Contribution to journalArticle

Inokawa, Hitoshi ; Maeda, Makoto ; Nishimoto, Shunsuke ; Kameshima, Yoshikazu ; Miyake, Michihiro ; Ichikawa, Takayuki ; Kojima, Yoshitsugu ; Miyaoka, Hiroki. / Synthesis of nickel nanoparticles with excellent thermal stability in micropores of zeolite. In: International Journal of Hydrogen Energy. 2013 ; Vol. 38, No. 31. pp. 13579-13586.
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AU - Maeda, Makoto

AU - Nishimoto, Shunsuke

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AU - Miyake, Michihiro

AU - Ichikawa, Takayuki

AU - Kojima, Yoshitsugu

AU - Miyaoka, Hiroki

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AB - 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 H2 flow. 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 H2 generation than C2H4 generation during ethanol steam reforming reaction.

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