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    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/3843


    題名: 於陶瓷纖維紙上合成ZSM-5沸石與聚乙烯觸媒裂解之研究
    作者: 游振經;Chen-Ching Yu
    貢獻者: 化學工程與材料工程研究所
    關鍵詞: 陶瓷纖維;沸石;聚乙烯;觸媒;ceramic fiber;ZSM-5;PE
    日期: 2004-06-21
    上傳時間: 2009-09-21 12:24:02 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 本論文主要分成兩部分,第一部分是在陶瓷纖維紙上合成ZSM-5沸石;第二部分則是將聚乙烯進行觸媒裂解的研究。 於陶瓷纖維紙上合成ZSM-5沸石的研究中,採用溶液法與乾膠法合成,其中乾膠法又分為直接乾膠法、纖維酸處理後乾膠法與蒸氣合成法。以溶液法合成時,必需經過二次合成才可以獲得良好的覆蓋率,但ZSM-5沸石容易相互堆積。乾膠法研究中,一次合成時的合成溫度160℃,合成時間18~27小時的條件下,可以獲得較佳的晶型及表面積;以一次乾膠合成9小時的產品進行二次合成時,於二次合成時間9小時下,陶瓷纖維表面可以完全的覆蓋ZSM-5沸石;蒸氣合成時,陶瓷纖維紙沾膠後以80℃預熱,合成溫度160℃,蒸氣合成8小時下,晶型及表面積結果皆獲得良好的結果;纖維酸處理後表面變的較為粗糙而提供了成核位置利於ZSM-5生長,於一次乾膠法合成後,纖維表面即可完全覆蓋沸石。 聚乙烯(PE)觸媒裂解研究中,主要目的是將廢塑膠裂解為液態產物。反應方式採用兩階段裂解方式,第一階段以流體化床反應器進行熱裂解,裂解溫度530℃,載氣流速34 L/min,反應時間3小時,裂解所得到的產物導入第二階段固定床反應器進行觸媒裂解程序。選用的觸媒有Y型沸石、無結晶相矽酸鋁、含鋁MCM-41分子篩、ZSM-5沸石(矽鋁比31.7及21.6)及兩種重金屬含量不同的流體化催化裂解觸媒(FCC觸媒)。裂解反應結果中FCC(light)於觸媒床溫度400℃與450℃時,裂解產物全為液體,除了FCC(light)觸媒外,Y型觸媒床400℃時,液化比例為72.22 wt%;500℃時液化比例為54.3 wt%。觸媒床溫度450℃時,FCC(heavy)觸媒液化產率則為60.5 wt%。具有較強酸性的ZSM-5觸媒與高表面積的矽酸鋁、Al-MCM-41皆造成氣態的產率偏高。液體產物中的碳數分佈則隨著觸媒床溫度升高而更集中於C5~C12。BTX含量方面,Y型觸媒裂解產物芳香化程度最明顯。載氣流速測試中,使用Y型觸媒於載氣流速200ml/min下所得到的液體產物高於載氣流速100ml/min情況下。積碳分析結果Y型觸媒積碳程度最嚴重,沸石ZSM-5則最為輕微。 Two main topics are studied in this research. One is the synthesis of ZSM-5 on ceramic fiber paper. The other is the catalytic pyrolysis of polyethylene. Both solution and dry gel methods were applied. in the synthesis of ZSM-5 on ceramic fiber paper. Dry gel methods were further divided into direct synthesis, steam method and acidic treatment of ceramic fiber before synthesis. Two step synthesis was applied in order to obtain high coverage of ceramic fiber in solution method. The highest crystallinity and surface area in one step synthesis of dry gel method was obtained at 160℃ for 18-27 hours under hydrothermal condition. However, the ceramic fibers are not completely covered with ZSM-5. The products of the first step synthesis at 160℃ for 9 hours were used for the second step synthesis. Complete coverage of ceramic fibers with ZSM-5 was obtained after heating at 160℃ for 9 hours. The best result is obtained when the gel-coated fibers were heated at 80℃ before synthesis and were steamed at 160℃ for 8 hours in an autoclave. Acid treatment of the ceramic fiber paper provides more nucleation sites. The fibers is completely covered by an uniform layer of well-shaped ZSM-5 crystals after 9 hours heating at 160℃. Pyrolysis of PE into liquid products is the goal of second part study. Two stages pyrolysis was applied. The first stage was thermal pyrolysis at 530℃ under 34 L/min of nitrogen stream in a fluidized bed reactor. The product of the first stage pyrolysis was transmitted to a secondary stage fixed bed reactor for catalytic pyrolysis. The catalysts for pyrolysis were Y-type zeolite, ZSM-5 (Si/Al=31.6 and 21.6), amorphous silica-alumina, Al-MCM-41, and two kinds of FCC waste catalysts, FCC (light) and FCC (heavy), with different amounts of heavy metals. A hundred percent of liquid products were obtained over FCC (light) at 400℃ and 450℃. Liquid products of 72.2 and 54.3% wt% were obtained over Y-type zeolite at 400℃and 500℃, respectively. At 450℃, liquid products of 60.5 wt% were obtained over FCC(heavy). More gas products were obtained over strongly acidic ZSM-5 and high surface area amorphous silica alumina and Al-MCM-41. Product of C5~C12 increase with reaction temperature. The high yield of aromatic compound over Y type zeolite were obtained. The fraction of liquid products increases with decreasing contact time over Y type zeolite. Finally, the largest amount of coke was formed on Y-type zeolite, and smallest amount of coke was formed ZSM-5 among the catalysts studied.
    顯示於類別:[化學工程與材料工程研究所] 博碩士論文

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