The decomposition of ethanol over Mo<sub>2sub>C/carbon catalysts

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• 作者：Ró ; bert Barthos ; Aleks ; ar Sz&#xe9 ; chenyi ; Á ; kos Koó ; s ; Frigyes Solymosi
• 关键词：Hydrogen production ; Ethanol decomposition ; Preparation of Mo<sub>2sub>C on Norit ; Mo<sub>2sub>C on carbon nanotube ; X-ray photoelectron spectroscopy ; Mo<sub>2sub>C catalyst ; Carbon as a support
• 刊名：Applied Catalysis A ; General
• 出版年：2007
• 期刊代码：4_0926860x
• 类别：ch
• 出版时间：31 July 2007
• 卷：327
• 期：1
• 页码：95-105
• 文件大小：427 K

摘要

The formation of Mo<sub>2sub>C by the reaction of MoO<sub>3sub> with carbon Norit in H<sub>2sub> flow was followed by X-ray photoelectron spectroscopy. It was found that the conversion of MoO<sub>3sub> into Mo<sub>2sub>C in the surface layer of Norit was complete at 973 K. Mo<sub>2sub>C prepared in this way on the surface of carbon Norit was found to be an effective catalyst for the decomposition of ethanol to generate H<sub>2sub>; the extent of the reaction approached 100%even at 623–673 K. Depending on the temperature and the Mo<sub>2sub>C loading about 32–62%of hydrogen content of the decomposed ethanol has been converted into H<sub>2sub>. Besides H<sub>2sub>, acetaldehyde was the major product indicating that the dehydrogenation reaction of ethanol is the main process. The formation of CH<sub>4sub>, CO, C<sub>2sub>H<sub>4sub> and C<sub>2sub>H<sub>6sub> also occurred in few percents. Another feature of the Mo<sub>2sub>C/Norit catalysts is its high stability. The conversion of ethanol decreased only with few percent even after 75 h at 723 K. Adding potassium to Mo<sub>2sub>C/Norit enhanced the catalytic efficiency of Mo<sub>2sub>C and increased the formation of hydrogen. Mo<sub>2sub>C prepared on multiwall carbon nanotube also proved to be active for the decomposition of ethanol. Adding water to ethanol enhanced the hydrogen production only to a small extent.