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研究生:許文獅
研究生(外文):Hsu,Wen Su
論文名稱:化學銅觸媒酸度與銅表面積及其環己醇脫氫反應之研究
論文名稱(外文):The Study of Acidity and Copper Surface Area of Electroless Copper Catalysts and Their Effects on the Dehydrogenation of Cyclohexanol
指導教授:張新福張新福引用關係
指導教授(外文):Chang,Hsin Fu
學位類別:碩士
校院名稱:逢甲大學
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:1994
畢業學年度:82
語文別:中文
論文頁數:68
中文關鍵詞:無電鍍伽瑪氧化鋁銅表面積環己醇脫氫反應
外文關鍵詞:ElectrolessGamma AluminaCopper Surface AreaDehydrogenation of Cyclohexanol
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本文以無電鍍法製備的七種不同銅含量 ( 4.5-22.3 ﹪) 伽瑪氧化鋁為載
體之化學銅觸媒, 對環己醇的脫氫反應進行研究, 探討觸媒酸度﹑銅表面
積及銅含量對環己醇脫氫反應速率及選擇率的影響。觸媒及載體分別以愛
克斯射線繞射儀﹑掃描式電子顯微鏡及電子微探分析儀分析表面結構及晶
相, 並自行規劃建立真空熱控系統, 可分別以氨氣與氧化亞氮為化學吸附
質, 準確量度銅表面積與酸度, 一機兩用, 所費不多, 測量方便。觸媒反
應器為一連續式固定床微反應系統, 反應產物以氣相層析儀分析其組成。
由電子顯微照相研判得知銅含量在4.5 至18.1﹪階段, 其銅積附狀況相當
均勻; 此後, 層覆及聚塊現象漸次出現, 但銅晶粒基本分佈還是相當均勻
。從繞射分析可知在銅含量約在 7.1 ﹪時, 始見其長成, 其外表面晶粒
大小幾乎相同, 約為200 埃。兩者之現象分析相當一致。由所得之實驗結
果分析, 環己醇的脫氫反應深受銅表面積影響, 而其脫水反應卻受有效酸
度所左右。銅表面積及脫氫反應的轉化率隨銅含量之增加而增加, 當增至
銅含量為 15﹪ 以後便隨之下降。在較低銅含量範圍之內, 酸性點對於脫
水反應的效率幾乎相等, 而不受觸媒製備法影響。但在較高之銅含量時,
無電鍍法製備的觸媒, 其酸度對脫水反應則較尿素水解法者為低; 雖然前
者之酸度較高, 但其脫水反應之選擇率卻是較低的。故反應條件之選擇,
宜兼顧到反應的轉化率及選擇率。

The dehydrogenation of cyclohexanol was catalized with Copper/
gamma-Alumina catalyst prepared by the electroless copper
plating technique.Seven gamma-alumina supported copper
catalysts by the electroless copper plating method and the
support itself were investigated to characterize by X-ray
diffraction (XRD),scanning electron micrography (SEM) and
electron probe microanalysis (EPMA). The copper surface area
was measured by the selective chemisorption of nitrous oxide
and the acidity was measured by the chemisorption of ammonia
using the volumetric method in a self-setup ultra vacuum
system. The reaction was carried out in a fix-bed micro-reactor
and a gas chromatograph was used to analyze the products. The
dehydrogenation activity strongly depends on the number of
exposed copper sites and the dehydration activity was clearly
influenced by the effective acid sites of the catalysts. The
copper surface area increases with loading up to ca. 15 wt﹪
copper; above this loading the reduction of copper surface area
was observed . The efficiency of the acid site is almost same
and is independent of the preparation method in the lower
copper loading range. But at high copper content the efficiency
of the acid site is relatively low when compared with the
catalysts prepared by the urea hydrolysis procedure. Though the
acid amount of the catalysts prepared by the electroless method
was higher than the catalysts prepared by the urea hydrolysis
procedure, the selectivity to cyclohexene was relatively low.
In this study, both the copper surface area and the acidity of
Cupper/Alumina catalysts were satisfactorily measured in a
relatively inexpensive apparatus with easy construction.

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