Hydrothermal synthesis of pure-phase hierarchical porous hexagonal WO3 microspheres as highly efficient support for Pd catalyst for hydrogenation--颗粒学报PARTICUOLOGY

Zhang, H., Wang, J., Liu, X., Ma, X., & Zhu, W. (2018). Hydrothermal synthesis of pure-phase hierarchical porous hexagonal WO3 microspheres as highly efficient support for Pd catalyst for hydrogenation. Particuology, 41, 126-132. https://doi.org/10.1016/j.partic.2018.01.014

Hydrothermal synthesis of pure-phase hierarchical porous hexagonal WO₃ microspheres as highly efficient support for Pd catalyst for hydrogenation

Heng Zhang ^*, Jiajia Wang, Xu Liu, Xinxin Ma, Wancheng Zhu ^*

School of Chemistry and Chemical Engineering, Qufu Normal University, Shandong 273165, China

10.1016/j.partic.2018.01.014

Volume 41, December 2018, Pages 126-132

Received 24 August 2017, Revised 25 January 2018, Accepted 27 January 2018, Available online 9 July 2018, Version of Record 1 November 2018.

E-mail: zhangheng@mail.qfnu.edu.cn; zhuwancheng@tsinghua.org.cn

Highlights

• Pure phase h-WO₃ microspheres were synthesized hydrothermally without structure directing agents.

• Dehydration and crystal growth of initial hydrate phases were controlled to avoid impurity phases.

• Pd/h-WO₃ exhibited good catalytic activity and recyclability for the hydrogenation of styrene.

Abstract

Hexagonal tungsten trioxide (h-WO₃) microspheres were synthesized by a hydrothermal method, with ammonium paratungstate and hydrochloric acid as the raw materials. The effects of the process parameters on the phase compositions and morphologies of the products were investigated. The results showed that the hydrothermal temperature and molar ratio of the raw materials were important for avoiding the formation of impurity phases, namely WO₃·0.33H₂O and WO₃·H₂O. The pure-phase h-WO₃ microspheres had a specific surface area of 40.0 m²/g, and were assembled from nanorods. The microspheres were used to support Pd, and the obtained Pd/h-WO₃ catalyst showed excellent catalytic activity in the hydrogenation of styrene under mild conditions, with a turnover frequency of 3050 h⁻¹. The catalyst was recycled five times without loss of activity, i.e., the supported catalyst had good recyclability.

Graphical abstract

Keywords

Tungsten trioxide; Hydrothermal synthesis; Supported catalyst; Hydrogenation

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