Ethylene and Acetaldehyde Production by Selective Oxidation of Ethanol Using Mesoporous V−MCM-41 Catalysts
Ethylene and Acetaldehyde Production by Selective Oxidation of Ethanol Using Mesoporous V−MCM-41 Catalysts
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DOI：
10.1021/ie050952j
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发表时间：
2006-04
影响因子：
4.2
通讯作者：
Yesim Gucbilmez and;T. Dogu;S. Balci
中科院分区：
文献类型：
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作者：
Yesim Gucbilmez and;T. Dogu;S. Balci
采用直接水热法合成了钒掺杂的MCM-41型催化材料，并对乙醇氧化制乙烯反应进行了研究，结果表明，钒掺杂的MCM-41型催化材料具有很高的活性和选择性。乙烯选择性显示出随着温度增加超过300 °C而显著增加，而在较低温度下观察到相对高的乙醛选择性。在400 °C、O2/乙醇进料比为0.5的情况下获得的乙烯产率值为0.66，从这些结果可能为从非石油环保原料生产乙烯开辟新途径的角度来看是有益的，即生物乙醇。催化剂的最佳V/Si比为0.04左右，乙烯产率最高。实验结果表明，在没有气相氧的情况下，乙醛的形成，而没有显示出乙烯的形成，并在这种条件下观察到的催化剂失活，建议氧化还原方法。
Vanadium-incorporated MCM-41 type catalytic materials, which were synthesized by a direct hydrothermal synthesis procedure, showed very high activity and high selectivity in the production of ethylene from ethanol in an oxidative process. Ethylene selectivity showed a significant increase with an increase in temperature over 300 °C, while relatively high acetaldehyde selectivities were observed at lower temperatures. An ethylene yield value of 0.66 obtained at 400 °C with an O2/ethanol feed ratio of 0.5 was beneficial from the point of view that these results might open a new pathway for the production of ethylene from a nonpetroleum environmentally friendly feedstock, namely, bioethanol. The optimum V/Si ratio of the catalyst, which gave the maximum ethylene yield, was found to be around 0.04. Experimental results showing the formation of acetaldehyde and not showing the formation of ethylene in the absence of gas-phase oxygen and the catalyst deactivation observed in such conditions suggested a redox me...