• 作者： Ko, Sun-Hua; Chou, Tse-Chuan
• 中文摘要： 本文以無電鍍法製備鎳磷/.gamma.-氧化鋁觸媒,其中鍍浴以次磷酸根為還原劑。由吸附恆溫線的結果顯示,無電鍍觸媒(E1 catalyst)在900Pa時的氫吸附量約為2.9.mu.mol/g觸媒,此值遠較含浸觸媒為低,然而在吸附期間卻可發現,氫仍緩慢而持續地被吸附到觸媒中,而其分散度及 150.degree.C時的氫化轉化數分別為0.31%及9.0/sec。此外,配有連線質譜儀的程溫脫附結果指出,以此法製得之觸媒會預吸附若干物質,並可於高溫下脫附之。XRD結果則顯示該觸媒為非晶形觸媒,但若於400.degree.C鈍氣下熱處理,將有晶形析出的明顯結構變化,也因此使其分散度改變,而不適於施以傳統化學吸附前的加熱除氣步驟。而其對.alpha.-蒎烯氫化的高催化活性則可能歸因於其奇特的非晶形特性。
• 英文摘要： The nickel-phosphorus/.gamma.-alumina catalyst was prepared by electroless deposition method using hypophosphite as a reducing agent. The results of adsorptive isotherms indicated that the hydrogen uptake of electrolessly-deposited catalyst (E1 catalyst) at 900Pa was about 2.9.mu.mol/g catalyst and was relatively lower than that of impregnated catalyst. The corresponding dispersion and turnover number at 150.degree.C were 0.31% and 9.0/sec, respectively. The hydrogen, however, was found to be slowly adsorbed by this catalyst. The results of TPD equipped with an on-line mass spectrometer revealed that the prepared catalyst had preadsorbed some species which could be desorbed at higher temperature. The results of XRD indicated that the amorphous state of the prepared catalyst underwent apparent change after heat treatment in inert gas at 400.degree.C. This reconstruction of crystallinity, resulting in somewhat change of dispersion of catalyst, made the cleaning of catalyst surface for hydrogen uptake of chemisorptive analysis be unsatisfied. Perhaps the high activity in hydrogenation of .alpha.-pinene was ascribed to the novel amorphous characteristics of the prepared catalyst.
• 中文關鍵字： 無電鍍觸媒; 非晶質; 氫化; 氫化學吸附; 程溫脫附
• 英文關鍵字： Electrolessly-Deposited Catalyst; Amorphous; Hydrogenation; Hydrogen Chemisorption; Temperature-Programmed Desorption