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Updated: Oct 25, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
Published on: August 23, 2018
Catalytic perchlorate reduction over supported Ru catalysts: Support effects and the origin of CeO2-induced activity
Jianqi Wang1, Kaili Huang1, Ryoichi Otomo2
1Graduate School of Environmental Science, Hokkaido University, Nishi 5, Kita 10, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
Abstract:
Catalytic hydrogenation over supported Ru catalysts offers an effective way for perchlorate (ClO4-) decomposition in water to Cl-; however, the role of catalyst supports in determining catalytic performance remains poorly understood. In this study, Ru catalysts supported on five oxide supports were evaluated for ClO4- reduction with H2. Among them, Ru/CeO2 and Ru/ZrO2 showed markedly higher activities than Ru/SiO2, Ru/Al2O3, and Ru/TiO2. The catalytic activity generally correlated with Ru dispersion and the electronic state of Ru. In particular, Ru/ZrO2 contained highly dispersed Ru species and electron-rich Ru sites, both of which contributed to its high activity. In contrast, Ru/CeO2 deviated from this trend. Kinetic analysis revealed that the exceptional activity of Ru/CeO2 originated from enhanced activation of adsorbed ClO4- rather than from H2 activation. Systematic variation of the CeO2 source and pre-calcination temperature further showed that spectroscopic features associated with the local Ru-CeO2 interfacial environment correlated with turnover frequency, whereas no single oxygen-defect descriptor alone accounted for the activity variation. These findings highlight the important role of the specific Ru-CeO2 interfacial environment in promoting ClO4- activation.
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