• 作者： Chang, Tsong-Huei; Leu, Fang-Chin
• 中文摘要： Sn/Al/sub 2/O/sub 3/及Sn-Pt/Al/sub 2/O/sub 3/觸媒用初期潤溼法所製備並用/sup 119/Sn核磁共振以研究其性質。Sn/Al/sub 2/O/sub 3/觸媒之/sup 119/Sn核磁共振信號具異方位性,其值為 0.755%(K/sub .perp./)及0.813% (K/sub .dbar./)。當Sn與Pt形成合金時其Knight位移即發生改變,此意謂著Sn的電子性質受Pt存在的影響。另外,觸媒的製備方法也會對合金觸媒的電子性質產生影響。
• 英文摘要： Pt/Al/sub 2/O/sub 3/, Sn/Al/sub 2/O/sub 3/, and Pt- Sn/Al/sub 2/O/sub 3/ catalysts were prepared by incipient wetness impregnation and sequential impregnation and characterized by NMR, TPR, and XRD. The Knight shifts in the /sup 119/Sn NMR absorption peaks from these catalysts were monitored by wide-line solid state NMR spectroscopy. The peaks from the Sn/Al/sub 2/O/sub 3/ catalyst were anisotropic with the Knight shifts at 0.755% (K/sub .perp./) and 0.813% (K/sub .dbar./). The Knight shift of tin changes when it is alloyed with platinum. The changes in the Knight shift suggest that the electronic properties of tin atoms in bimetallic catalysts are strongly affected by the presence of platinum. Furthermore, the preparation method was found to be an important factor affecting the electronic structure of Pt-Sn alloy catalysts.
• 中文關鍵字： 雙金屬觸媒; 核磁共振; X-射線繞射; 氧化鋁; 錫
• 英文關鍵字： Bimetallic Catalyst; Nuclear Magnetic Resonance (Nmr); X-Ray Diffraction (Xrd); Alumina; Tin