- 作者: 張峻碩 ; 鍾松政 ; 鄭淑芬
- 作者服務機構: 台灣大學化學系
- 中文摘要: The metal-support interaction in the system of platinum supported on titanium oxides of different crystalline structures was investigated. Titanium oxide powders used as supports were prepared by neutralization of TiOCl/sub 2/-analogue solution with either NaOH or NH/sub 3/ base at varied pH. Pt was introduced onto the supports by impregnation. The phenomenon of strong metal-support interaction (SMSI) was determined by the suppression of chemisorption of H/sub 2/ over samples reduced at 773K, in comparison with the behavior of samples reduced at 473K. The loss of adsorption capacity was proved not due to metal sintering by examining the recovery of adsorption capacity after reduction, reoxidation and reduction cycle, accompanied with examination of the size of Pt particle with an X-ray diffractiometer and a transmission-electron microscope. The results showed that SMSI phenomenon was common to Pt supported on titanium oxides of all the varied crystalline structures. However, the chemisorption capacity of Pt reduced at 473K varied greatly with the sodium content in the supports, which in turns affects the crystalline structure of titanium oxide. These results are attributed mainly to electronic effect endowed by the support.
- 英文摘要: --
- 中文關鍵字: Titanium Oxide; Metal-Support Interaction; Crystal Structure; Sodium Content
- 英文關鍵字: 氧化鈦;金屬膽體交互作用;晶體結構;鈉含量