多壁奈米碳管觸媒：製備、鑑定與苯乙烯之催化氫化

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Title:	多壁奈米碳管觸媒：製備、鑑定與苯乙烯之催化氫化
Other Titles:	Ni/MWCNTs Catalysis : Preparation, Characterization,and Catalytic Hydrogenation of Styrene
Authors:	許正一 Hsu, Cheing-Yi
Contributors:	柯安男 Ko, An-Nan 東海大學化學系
Date:	2011
Issue Date:	2011-10-12T07:37:54Z (UTC)
Abstract:	以不同含量的鎳金屬負載於酸處理後的多壁奈米碳管來製備X wt% Ni/MWCNTs ( X = 4.4、8.8、15、30 %)觸媒，分別使用XRD、FE-SEM、N2物理吸附、TG/DTA等儀器，鑑定這些觸媒的性質包括結構、比表面積、熱穩定性、表面形貌等。由XRD與FE-SEM之鑑定結果得知鎳金屬的顆粒大小，也經由FE-SEM圖看出奈米碳管的管狀形貌；N2物理吸附顯示Ni/MWCNTs 屬於中孔結構，而孔洞分佈尚屬均勻；TG/DTA的結果發現隨鎳金屬含量增加，樣品升溫後所殘存的重量跟著增加。 Ni/MWCNTs觸媒於1大氣壓下利用固定床流動反應器進行苯乙烯的氫化反應，獲得唯一的產物乙苯，探討反應溫度、鎳含量、接觸時間以及氫氣流速等因素，對苯乙烯氫化反應的影響。獲知隨著溫度的升高，苯乙烯轉化率隨之增加。鎳含量增加到8.8%時，呈現最佳的催化活性。當接觸時間與氫氣流速增加時，苯乙烯轉化率也跟著提高，但氫氣/苯乙烯莫耳比大於2時，對催化結果的影響不顯著。 Different amounts of nickel were supported on MWCNTs to form 4.4, 8.8, 15, and 30% Ni/MWCNTs. These catalysts were characterized by XRD, FE-SEM, N2-adsorption, and TGA/DTA to obtain their physical properties, i.e., the structure, BET specific surface area, thermal stability, and the morphology. The Ni particle size was determined from XRD and FE-SEM measurements. FE-SEM results showed that the MWCNTs samples exhibited the tubular morphology. According to the results of N2-physisorption, the catalysts possessed mesoporous structures as well as uniform pore size distribution. TG/DTA results showed that after heating to high temperature the weight of residue remaining in the sample enhanced with the nickel content in the sample. The catalytic hydrogenation of styrene was carried out over Ni/MWCNTs at 1 atm in a fixed-bed flow reactor. Ethylbenzene was the only product. The effects of reaction temperature, Ni content, contact time, and flow rate of hydrogen gas on the catalytic results were investigated. It was found that the styrene conversion increased with increasing reaction temperature. As the nickel content in the catalyst increased up to 8.8%, the catalyst exhibited the best activity. An increase of contact time and flow rate of hydrogen gas enhanced the styrene conversion. However, no apparent influence was observed with H2/styrene mol ratio larger than 2.
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