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標題: 奈米級被擔持氧化鎢觸媒之甲醇氧化反應研究
Oxidation of Methanol over the Nanoscale Supported Tungsten Oxide Catalysts
作者: 鄭貴寧
Cheng, Kuei-Ning
關鍵字: nano-catalysts;奈米觸媒;metal oxide;methanol oxidation reaction;acid sites;redox sites;金屬氧化物;甲醇氧化反應
出版社: 化學工程學系所
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本研究中以水熱法合成出奈米級高比表面積的γ-Al2O3、Nb2O5、TiO2、ZrO2、CeO2為觸媒擔體,分別擔持1、3、5、10、20% 氧化鎢金屬氧化物為活性相。以TEM、XRD、BET、ICP對其做特性分析,並運用拉曼(Raman)光譜對奈米級被擔持氧化物觸媒其做表面結構進行分析,以瞭解表面金屬氧化物之動態變化。並進行甲醇氧化反應以氣相層析儀分析產物濃度,而得知此奈米級被擔持氧化物觸媒對氧化反應之活性及選擇性。
甲醇氧化反應研究結果顯示WOx/Al2O3、WOx/Nb2O5 、WOx/TiO2、WOx/ZrO2具有酸性基位於觸媒表面上,而 WOx /CeO2只有氧化還原基位位於觸媒表面。歸納反應結果以WOx/Al2O3此系列的被擔持觸媒之轉化率最好,並發現在鎢的附載量為3%以及5%時,轉化率為最佳。

In recent years, the catalyst have the new developing direction due to the development of nanometer technology. Because nanometer particle can have characteristics including high surface area, high binding energy and very high chemical activation, so Nanoscale particle catalyst was called the fourth generation of catalyst internationally.
Nanoscale supported metal oxide catalysts were synthesized by hydrothermal method. The supports are γ-Al2O3, Nb2O5, TiO2, ZrO2 and CeO2, and 1、3、5、10、20% of WO3 were deposited on the previous oxide supports, respectively. The physical properties and structural information were characterized by TEM, XRD, BET, ICP and in situ Raman spectroscopy. Raman results confirm that the desired molecular arrangements of the active surface metal oxide phases have been achieved. The reactivity/selectivity properties of the nano catalysts are chemically probed with steady-state catalytic studies of propane oxidative dehydrogenation and methanol oxidation reactions.
The results of methanol oxidation reaction reveal that there are acid sites on the surface of WOx/Al2O3 , WOx/Nb2O5 , WOx/TiO2 and WOx/ZrO2, and WOx / CeO2 only have redox sites on the surface of the other catalysts. To sum up the reaction result, the conversion of WOx/Al2O3 catalyst was the best. Simultaneously it was found that when loading of tung 3% and 5% , conversion ratio were the best.
其他識別: U0005-0311200616191400
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