Jang Hyun-Seok, Lee Chang Yeon, Jeon Jun Woo, Jung Won Taek, Mun Junyoung, Kim Byung Hoon
Department of Physics, Incheon National University, 22012 Incheon, Republic of Korea.
Institute of Basic Science, Incheon National University, 22012 Incheon, Republic of Korea.
J Adv Res. 2020 Jan 30;24:205-209. doi: 10.1016/j.jare.2020.01.014. eCollection 2020 Jul.
In the oxidative dehydrogenation (ODH) process that converts ethylbenzene to styrene, vanadium-based catalysts, especially VO, are used in a CO atmosphere to enhance process efficiency. Here we demonstrate that the activation energy of VO can be manipulated by exposure to high pressure CO, using VO nanowires (VON). The oxidation of V to V was observed by X-ray photoelectron spectroscopy. The ratio of V/V which the typical comparable feature decreased 73.42%. We also found an increase in the interlayer distance in VON from 9.95 Å to 10.10 Å using X-ray diffraction patterns. We observed changes in the peaks of the stretching mode of bridging triply coordinated oxygen (V-O), and the bending vibration of the bridging V-O-V, using Raman spectroscopy. We confirmed this propensity by measuring the CO pressure-dependent conductance of VON, up to 45 bar. 92.52% of decrease in the maximum conductance compared with that of the pristine VON was observed. The results of this study suggest that ODH process performance can be improved using the VON catalyst in a high pressure CO atmosphere.
在将乙苯转化为苯乙烯的氧化脱氢（ODH）过程中，钒基催化剂，尤其是VO，在CO气氛中使用以提高过程效率。在此我们证明，通过使用VO纳米线（VON）暴露于高压CO，可以操纵VO的活化能。通过X射线光电子能谱观察到V氧化为V。典型可比特征的V/V比率降低了73.42%。我们还利用X射线衍射图谱发现VON中的层间距从9.95 Å增加到10.10 Å。利用拉曼光谱，我们观察到桥连三配位氧（V-O）的拉伸模式峰以及桥连V-O-V的弯曲振动的变化。我们通过测量高达45 bar的VON的CO压力依赖性电导率证实了这种倾向。与原始VON相比，观察到最大电导率下降了92.52%。本研究结果表明，在高压CO气氛中使用VON催化剂可以提高ODH过程性能。
