High-purity, low-Cl V2O5 via the gaseous hydrolysis of VOCl3 in a fluidized bed--颗粒学报PARTICUOLOGY

Fan, C., Xu, J., Yang, H., & Zhu, Q. (2020). High-purity, low-Cl V2O5 via the gaseous hydrolysis of VOCl3 in a fluidized bed. Particuology, 49, 9-15. https://doi.org/10.1016/j.partic.2018.12.005

High-purity, low-Cl V₂O₅ via the gaseous hydrolysis of VOCl₃ in a fluidized bed

Chuanlin Fan ^{a b}, Jie Xu ^a^b, Haitao Yang ^{a b *}, Qingshan Zhu ^{a b *}

a State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
b School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

10.1016/j.partic.2018.12.005

Volume 49, April 2020, Pages 9-15

Received 5 August 2018, Revised 7 December 2018, Accepted 13 December 2018, Available online 14 June 2019, Version of Record 26 February 2020.

E-mail: yhtao@ipe.ac.cn; qszhu@ipe.ac.cn

Highlights

• High purity V₂O₅ was prepared via the gaseous hydrolysis of VOCl₃ in a fluidized bed.

• Vanadium oxytrichloride (VOCl₃) was used as the high purity precursor.

• A temperature of 500 °C and a H₂O/VOCl₃ molar ratio of 18 are optimal.

• High purity V₂O₅ with less than 0.05 wt% residual Cl was obtained in a yield of 85%.

Abstract

Present-day all-vanadium redox flow batteries (VRFBs) generally require high purity vanadium oxide as a raw ingredient. The chlorination procedure presents distinct technical advantages with regard to preparing high purity vanadium pentoxide (V₂O₅) using vanadium oxytrichloride (VOCl₃) as a highly pure intermediate. To efficiently prepare high purity V₂O₅ from VOCl₃, a single-step fluidized bed chemical vapor deposition (FBCVD) method was explored in the present work. Based on thermodynamic analyses, the direct and complete conversion of VOCl₃ to V₂O₅ is difficult, and may result in a small amount of residual Cl in the product. Consequently, the effects of temperature and the H₂O/VOCl₃ molar ratio on the quantity of residual Cl were assessed. The Cl concentration was found to decrease with increasing temperature or increasing H₂O/VOCl₃ molar ratios. Additionally, Cl was determined to be present only in the form of Clsingle bondV bonds, while Clsingle bondH and Clsingle bondCl bonds were not detected in a V₂O₅ product made at 200 °C with a H₂O/VOCl₃ molar ratio of 18. A Cl concentration of less than 0.05 wt% was obtained under the optimal synthesis conditions, demonstrating that the FBCVD method is a viable means of preparing high purity V₂O₅ via the gaseous hydrolysis of VOCl₃.

Graphical abstract

Keywords

Chlorination procedure; High purity VOCl₃; FBCVD; High purity V₂O₅; Gaseous hydrolysis; Chlorine

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