• 作者： Leu, Fang-Chin; Chang, Tsong-Heui
• 中文摘要： 利用初期潤溼法製備Ni-Rh/SiO/sub 2/, Rh/SiO/sub 2/,及Ni/SiO/sub 2/觸媒，並用氘核固態核磁共振光譜儀和熱磁法研究它們的之性質。結果顯示， Ni/SiO/sub 2/觸媒的居禮溫度出現在635K；但Ni-Rh/SiO/sub 2/觸媒則觀測不到居禮溫度。由氘核固態核磁共振光譜顯示，Rh/SiO/sub 2/，及Ni/SiO/sub2/觸媒的化學位移在300 torr的氘氣下分別為-30ppm及-60ppm，而Ni-Rh/SiO/sub 2/觸媒的化學位移則出現在較低磁場的方地。此外，Ni-Rh/SiO/ sub 2/觸媒的化學位移亦受Ni/Rh比的影響。當Ni/Rh比增高時，則化學位移往高磁場方向位移，最終在Ni/Rh=5時為-38ppm。以上這些現象是由於Ni-Rh/SiO/sub 2/觸媒中的Ni與Rh形成了Ni-Rh合金的緣故。
• 英文摘要： Catalysts of Ni-Rh/SiO/sub 2/, Rh/SiO/sub 2/, and Ni/SiO/sub 2/ were prepared by the incipient wetness method and characterized with techniques of thermomagnetometry and /sup 2/H NMR spectroscopy. The Ni/SiO/sub 2/ showed a Curie temperature around 635K. On the contrary, no Curie transition temperature was observed for all the Rh-Ni/SiO/sub 2/ catalysts. Observed chemical shifts of deuterium adsorbed on Ni/SiO/sub 2/ and Rh/SiO/sub 2/ catalysts were -38 and-60ppm, respectively, under 300 Torr D/sub 2/, while the bimetallic Ni-Rh/SiO/sub 2/ catalysts showed a more downfield shift. Further, the observed chemical shift for the bimetallic catalysts also showed a Ni/Rh ratio dependent and shifted toward upfield with Ni/Rh ratio; the chemical shift finally approached that of Ni/SiO/sub 2/ ( -38ppm) as the Ni/Rh ratio was higher than five. These occurrences were attributed to the formation of bimetallic Ni-Rh alloy.
• 中文關鍵字： 錸; 雙金屬催化劑; 核磁共振; 熱磁
• 英文關鍵字： Rhenium (Rh); Bimetallic Catalyst; Nmr; Thermomagnetometry