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Partic. vol. 41 pp. 126-132 (December 2018)
doi: 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*

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zhangheng@mail.qfnu.edu.cnzhuwancheng@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