• 作者： Chen, Ienwhei; Chen, Fan-Lun
• 中文摘要： 本研究在探討添加鑭、鎢及鉬促進劑之Ni/Al/sub 2/O/sub 3/觸媒在正己烷裂解反應中, 對焦碳形成和鎳燒結的抵抗性, 其反應條件為773K、一大氣壓。反應前後的觸媒以X射線繞射儀(XRD), 可程式加溫還原儀(TPR), 可程式加溫脫附儀(TPD), 可程式加溫積碳氫化反應儀(TPH), 和碳含量分析來量測其特性。實驗結果顯示, 添加鑭、鎢及鉬促進劑能顯著地改善Ni/Al/sub 2/O/sub 3/觸媒鎳燒結的抵抗性, 且鉬和鎢促進劑能降低觸媒的積碳速率。添加促進的鎳觸媒依積碳速率大小來排序, 與依其TPD及TPH的波峰溫度大小的觸媒排序相符,即鎳-鑭>鎳-鎢>鎳-鉬觸媒。
• 英文摘要： Resistivity to coke formation and nickel sintering during catalytic cracking of n-hexane at 773K and 1 atm has been investigated over nickel-alumina catalysts with promoters such as La, W, and Mo, respectively. The characterizations of fresh and spend catalysts were analyzed by X-ray diffractometer (XRD), temperature- programmed reduction (TPR), temperature-programmed desorption (TPD), temperature-programmed hydrogenation of carbon deposit (TPH), and chemical analysis of carbon. Results show that the resistivity to nickel sintering of promoted nickel-alumina catalysts is improved significantly by addition of Mo, W and La. The promoters Mo and W also decrease coking rate of nickel catalysts, The ordering of promoted nickel catalysts by the coking rate is in accordance with that by the peak temperature of both TPD and TPH spectra of these catalysts, which is Ni-La>Ni-W>Ni- Mo catalyst.
• 中文關鍵字： 焦炭形成; 鑭; 鎢; 鉏; 鎳; 燒結
• 英文關鍵字： Coke Formation; Lanthanum (La); Tungsten (W); Molybdenum (Mo); Nickel (Ni); Sintering