2002年
Sintering behavior of Pt metal particles supported on silica-coated alumina surface
CATALYSIS LETTERS
- ,
- ,
- ,
- 巻
- 78
- 号
- 1-4
- 開始ページ
- 43
- 終了ページ
- 47
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1023/A:1014976316570
- 出版者・発行元
- KLUWER ACADEMIC/PLENUM PUBL
The sintering behavior of Pt metal particles was studied by supporting them on silica-coated alumina. Silica coating was found to be effective for the retention of a large surface area of alumina even after calcination at elevated temperatures. Before sintering, the size of Pt metal particles on all the silica-coated aluminas, including the uncoated alumina, was identical. while the particle size was larger on silica than on alumina. After sintering the Pt catalyst at 1073 K, the particle size increased on uncoated alumina as well as on alumina coated with thicker silica layers, especially on the supports previously calcined at > 1473 K. On the other hand, the size of Pt metal particles did not increase much on alumina coated with monolayer silica. The observed suppression of sintering of Pt metal particles resulted from the retention of a large surface area of alumina with a thinner silica layer. In the case of a thicker silica layer, although a large surface area was maintained after calcination at elevated temperatures, the existence of a bulk silica-like property of the support did not favor the suppression of sintering of Pt metal particles.
- リンク情報
- ID情報
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- DOI : 10.1023/A:1014976316570
- ISSN : 1011-372X
- CiNii Articles ID : 80015221029
- Web of Science ID : WOS:000175691600007