• 作者： Chen, Yu-Wen; Huang, Shao-Chiou; Wang, Wei-Jye
• 中文摘要： 本研究探討添加鋰、鈉、鉀、銣、銫鹼金屬對添觸媒在氧化碳氫化反應之影響, 鹼金屬之促進效果係由氫氣程式升溫脫附, ESCA, 和一氧化碳氫化來探測。反應實驗條件為一大氣壓, 溫度 200 - 280 .degree.C, 及空間流速 1, 800 hr/sup -1/。觸媒對一氧化碳氫化之轉化頻率係以下列方式降低: 未添加鹼金屬->添加鋰->添加鈉->添加鉀->添加銣->添加銫之觸媒。添加鹼金屬亦會使烯類與高分子量產物之選擇性增加。所有實驗結果顯示鹼金屬會略微轉移電子至釕金屬觸媒上, 因而改變其催化性質。
• 英文摘要： An experimental study is carried out to investigate alkali promotion effect on Ru/Al/sub 2/O/sub 3/ catalysts by using temperature-programmed desorption (TPD), ESCA, and CO- hydrogenation reaction. The study was carried out in a differential reactor at temperatures of 200 to 280.degree.C, a pressure of 1 atm with H/sub 2//CO = 1,and GHSV = 1,800 hr/ sup -1/. TPD studies of hydrogen suggest that a major portion of the alkali species is located on the alumina support rather than on the metal. ESCA results indicate a significant electronic effect of the alkali-metal interaction. The turnover frequencies of alkali-promoted Ru/Al/sub 2/O/sub 3/ catalysts decrease according to the following order: Unpromoted>Li->Na->K->Rb->Cs-promoted catalysts. The addition of alkali species tends to increase olefin selectivities. There exist oxygen-containing products, primary formaldehyde, which increase with increasing electropositivity. The results seem to support the electron transfer from promoter to Ru metal, leading to a higher electron density in the transition metal, a favorable state for the activation of CO- hydrogenation.
• 中文關鍵字： 釕觸媒; 一氧化碳氫化反應; 鹼金屬添加; 氫氣化學吸著; 電子光譜
• 英文關鍵字： Ruthenium Catalysts; Co Hydrogenation; Alkali Metal Promotion; Hydrogen Chemisorption; Esca; Electron Spectroscopy For Chemical Analysis