Interaction between V2O5 nanowires and high pressure CO2 gas up to 45 bar: Electrical and structural study

Hyun-Seok Jang; Chang Yeon Lee; Jun Woo Jeon; Won Taek Jung; Junyoung Mun; Byung Hoon Kim

doi:10.1016/j.jare.2020.01.014

Interaction between V₂O₅ nanowires and high pressure CO₂ gas up to 45 bar: Electrical and structural study

J Adv Res. 2020 Jan 30:24:205-209. doi: 10.1016/j.jare.2020.01.014. eCollection 2020 Jul.

Authors

Hyun-Seok Jang^{1

2

3}, Chang Yeon Lee⁴, Jun Woo Jeon^{1

2

3}, Won Taek Jung^{1

2

3}, Junyoung Mun⁴, Byung Hoon Kim^{1

2

3}

Affiliations

¹ Department of Physics, Incheon National University, 22012 Incheon, Republic of Korea.
² Institute of Basic Science, Incheon National University, 22012 Incheon, Republic of Korea.
³ Intelligent Sensor Convergence Research Center, Incheon National University, 22012, Incheon, Republic of Korea.
⁴ Department of Energy and Chemical Engineering, Incheon National University, Incheon 22012, Republic of Korea.

Abstract

In the oxidative dehydrogenation (ODH) process that converts ethylbenzene to styrene, vanadium-based catalysts, especially V₂O₅, are used in a CO₂ atmosphere to enhance process efficiency. Here we demonstrate that the activation energy of V₂O₅ can be manipulated by exposure to high pressure CO₂, using V₂O₅ nanowires (VON). The oxidation of V⁴⁺ to V⁵⁺ was observed by X-ray photoelectron spectroscopy. The ratio of V⁴⁺/V⁵⁺ 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 (V₃-O), and the bending vibration of the bridging V-O-V, using Raman spectroscopy. We confirmed this propensity by measuring the CO₂ 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 CO₂ atmosphere.

Keywords: Carbon dioxide; High CO2 pressure; Oxidative dehydrogenation; V2O5 Nanowire.