Preparation method for supported metal catalysts using w/o microemulsion

Study on immobilization conditions of metal particles by hydrolysis of alkoxide

Masahiro Kishida, Ken Ichiro Ichiki, Toshiaki Hanaoka, Hideo Nagata, Katsuhiko Wakabayashi

研究成果: ジャーナルへの寄稿記事

29 引用 (Scopus)

抄録

It was previously found that the silica-supported rhodium catalyst prepared using water-in-oil microemulsion had rhodium particles partly, or wholly, embedded in silica. In this work, consequently, we investigated the effect of hydrolysis conditions of tetraethylorthosilicate, employed as the source of silica, on the atomic ratio of surface rhodium in contact with the gas phase, to total surface rhodium of nanoparticles. This ratio is denoted as R in this paper. R became higher when the catalyst was prepared under the following hydrolysis conditions: a shorter hydrolysis time and a smaller amount of tetraethylorthosilicate. On the other hand, R showed the minimum value when the water content in the preparation solution was 33 vol%. From these results, it is demonstrated that it was important to form silica as early as possible in hydrolysis of TEOS in order to increase R values. In addition, the effect of R on the catalytic behavior in CO hydrogenation was investigated. At R values below 30%, the turnover frequencies increased with a decrease in R.

元の言語英語
ページ(範囲)203-208
ページ数6
ジャーナルCatalysis Today
45
発行部数1-4
DOI
出版物ステータス出版済み - 10 19 1998

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Rhodium
Microemulsions
Silicon Dioxide
Hydrolysis
Metals
Silica
Catalysts
Carbon Monoxide
Contacts (fluid mechanics)
Water content
Hydrogenation
Oils
Gases
Nanoparticles
Water
tetraethoxysilane

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

これを引用

Preparation method for supported metal catalysts using w/o microemulsion : Study on immobilization conditions of metal particles by hydrolysis of alkoxide. / Kishida, Masahiro; Ichiki, Ken Ichiro; Hanaoka, Toshiaki; Nagata, Hideo; Wakabayashi, Katsuhiko.

:: Catalysis Today, 巻 45, 番号 1-4, 19.10.1998, p. 203-208.

研究成果: ジャーナルへの寄稿記事

Kishida, Masahiro ; Ichiki, Ken Ichiro ; Hanaoka, Toshiaki ; Nagata, Hideo ; Wakabayashi, Katsuhiko. / Preparation method for supported metal catalysts using w/o microemulsion : Study on immobilization conditions of metal particles by hydrolysis of alkoxide. :: Catalysis Today. 1998 ; 巻 45, 番号 1-4. pp. 203-208.
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abstract = "It was previously found that the silica-supported rhodium catalyst prepared using water-in-oil microemulsion had rhodium particles partly, or wholly, embedded in silica. In this work, consequently, we investigated the effect of hydrolysis conditions of tetraethylorthosilicate, employed as the source of silica, on the atomic ratio of surface rhodium in contact with the gas phase, to total surface rhodium of nanoparticles. This ratio is denoted as R in this paper. R became higher when the catalyst was prepared under the following hydrolysis conditions: a shorter hydrolysis time and a smaller amount of tetraethylorthosilicate. On the other hand, R showed the minimum value when the water content in the preparation solution was 33 vol{\%}. From these results, it is demonstrated that it was important to form silica as early as possible in hydrolysis of TEOS in order to increase R values. In addition, the effect of R on the catalytic behavior in CO hydrogenation was investigated. At R values below 30{\%}, the turnover frequencies increased with a decrease in R.",
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