跳到主要內容

臺灣博碩士論文加值系統

(44.221.73.157) 您好!臺灣時間:2024/06/15 12:43
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

我願授權國圖
: 
twitterline
研究生:莊棨鈞
研究生(外文):Chuang, Chi-Chun
論文名稱:操作溫度及觸媒擔體對支撐式鉑觸媒抗硫性之影響
論文名稱(外文):Effects of Support and Reaction Temperature on the Sulfur Resistance of Supported Pt Catalysts
指導教授:張仁瑞
指導教授(外文):J. -R. Chang
學位類別:碩士
校院名稱:國立中正大學
系所名稱:化學工程研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:105
中文關鍵詞:硫中毒之觸媒活性衰減支撐式鉑觸媒氫化反應快速傅立葉轉換紅外線光譜
外文關鍵詞:X-射線吸收光譜sulfur-poisoning catalyst deactivationsupported Pt catalysthydrogenation reactionX-ray absorption spectroscopyfast Fourier transform infrared spectroscopy
相關次數:
  • 被引用被引用:2
  • 點閱點閱:238
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
中文摘要 本研究的目的在於探討操作溫度及觸媒擔體對於支撐式鉑觸
媒抗硫性之影響,並藉此尋求最佳之商業化工廠之操作溫度及觸媒擔體。
本研究以含有500ppm硫份(benzothiophene)的四氫化奈(tetralin)為進料
,在一連續式固定床反應器於480psig、WHSV=5.3 h-1、氫油比6.1之條件
下操作並改變操作溫度從250℃至360℃以進行操作溫度效應之觸媒性能測
試反應。在擔體效應方面, 是以alumina、amorphous Si/Al及不同矽鋁比
的Y-zeolite等擔體進行研究。為了了解觸媒的結構與其催化性質之關係
,本研究中所有反應過及新鮮的觸媒均進行精密的特性分析,包括:一氧
化碳化學吸附( CO chemisorption )、快速傅立葉轉換紅外線分析(FFT-
IR)、程溫還原分析(TPR)、原子吸收光譜分析(AA),及Extended X-ray
Absorption Fine Structure(EXAFS)分析等。由以上之實驗方法及特性分
析的結果,在操作溫度及觸媒擔體的效應上可以得到以下的結論:(1)在
低溫下反應(如250℃),觸媒活性衰減的主要原因為硫中毒所引發的金屬
聚集,而在高 溫下反應觸媒活性衰減的主要原因是由焦碳的生成所致
。(2)在我們測試的幾個操作溫度之中,320C為最佳之操作溫度。(3)在我
們測試的幾個擔體之中,以Y-zeolite製備的觸媒具有最佳之催化性能
。(4)由於鉑金屬叢缺電子之性質可抑制硫化氫吸附,因此當沸石擔體的
矽鋁比愈高,造成鉑 金屬叢的電子密度愈低,也就具有較佳的抗硫性


Abstract The goals of this research were to investigate the
effects of support and reaction temperature on the sulfur
resistance of supported Pt catalysts and aim at the
investigation of optimal reaction temperature and supportfor
commercial plants. The catalytic test reactions were
hydrogenation of tetralin containing sulfur 500 ppm. The
reactions were carried out with a continuous fix bed reactor at
480 psig, weight hourly space velocity 5.3h-1,hydrogen oil ratio
6.1 and the reaction temperature ranging from 250 to 360C.To
investigate the support effects, alumina, amorphous Si/Al, and
Y-zeolite with different Si/Al ratio were used for this study.
In order to correlate the catalytic properties with the
structure of the catalysts. Both fresh and used catalysts were
characterized by CO chemisorption, fast Fourier transform
infrared (FFT-IR) spectroscopy, temperature programmed
reduction(TPR), atomicabsorption spectroscopy(AA), and extended
X-rsy absorption fine structure(EXAFS). Together with the
complementary characterization results, the effectsof
temperature and sopportes are clearly indicated as following:(1)
At low temperature e.g. 250C, the main factor for catalyst
deactivation is metal agglomeration induced by sulfur-
poisoning, whereas at high temperature the catalyst was
mainly deactivated by coke formation.(2)Among the several
temperatures for the test reaction, 320C is optimal for the
reaction.(3)Among the supportes used for the catalyst
preparation, the catalysts with Y-zeolite support presents
the best catalytic performance. (4)Because the electron-
deficiency Properties of the Pt clusters inhibit the
adsorption of H2S, the zeolite supported catalysts with higher
Si/Al ratio also have less electron density of Pt clusters,
and thus presents the higher sulfur resistance.

QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top