以稻殼灰分初濕含浸製備擔體銅觸媒之研究

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Title:	以稻殼灰分初濕含浸製備擔體銅觸媒之研究
Authors:	李昆展;Kun-Chan Lee
Contributors:	化學工程與材料工程研究所
Keywords:	乙醇脫氫;銅觸媒;稻殼灰分;活性;dehydrogenation of C2H5OH;copper catalyst;rice husk ash;activity
Date:	2001-07-11
Issue Date:	2009-09-21 12:19:45 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本研究以初濕含浸法製備稻殼灰分擔載銅觸媒，實驗結果顯示：降低金屬載量，將有助於提升觸媒的分散度;觸媒的還原溫度隨載量增加而降低，但金屬粒徑卻隨載量增加而變大。 Cu/SiO2-RHA觸媒應用在533K∼613K乙醇脫氫反應活性測試，結果顯示稻殼灰分擔體銅觸媒在反應溫度範圍內，僅有脫氫反應的發生，生成單一產物乙醛，且催化活性隨著反應溫度與金屬載量的增加而逐漸增高。本實驗採用5wt. %的Cu/SiO2-RHA觸媒，先經過723K下鍛燒3小時後，在573K的還原程序下還原1小時，及在613K下進行乙醇脫氫反應，可得到良好的催化活性，使得乙醇轉化率提升。經由TPR及N2O-titration的分析證明，稻殼灰分特有的擔體性質，使其呈現與金屬間較強的擔體效應，優於氧化矽膠擔體銅觸媒及氧化鋅擔體銅觸媒，是一種具有高促進效果的乙醇脫氫反應銅觸媒擔體。 Rice husk ash (RHA) supported copper catalysts were prepared by impregnation method. During the investigations of preparation conditions, effects of copper loading, reduction temperature, reaction time and reaction temperature on catalytic behavior were presented and discussed. The results indicate that the metal dispersion increases with decreasing of copper loading; the reduction temperature decreases with increasing of copper loading, and the metal grain size increases with increasing of copper loading. RHA supported copper catalyst was examined in the dehydrogenation of C2H5OH at 533∼613K and it formed a single product C2H4O. The results also indicate that the catalytic activity increases with increasing of reaction temperature and copper loading; the activity of copper catalyst achieves a maximum value with a copper loading of 5 wt.% , calcined at 723K for 3h and reduced at 573K for 1h in C2H5OH dehydrogenation at 613K. Moreover, RHA is found to be preferable over silica gel and ZnO as a catalyst support as revealed by the TPR and N2O titration techniques.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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