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<p>Liquid organic hydrogen carriers (LOHCs) have emerged as promising media for hydrogen storage and transport owing to their high hydrogen content and compatibility with existing infrastructure. However, the catalytic efficiency of Ru-based catalysts in LOHC hydrogenation is strongly influenced by the properties of their support materials, which remain insufficiently explored. In this study, Ru nanoparticles were supported on four different metal oxides (Al<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub>, ZrO<sub>2</sub>, and SiO<sub>2</sub>) synthesized via a combined sol–gel and ultrasonic spray pyrolysis (USP) process, providing continuous processes amenable to large-scale production. The resulting metal oxide supports exhibited diverse physicochemical characteristics, including variations in surface area, surface hydroxyl group concentration, and metal–support interaction strength. The Ru-supported catalysts were systematically evaluated for the hydrogenation of monobenzyl toluene (MBT), a model LOHC compound. Catalytic activity followed the trend: Ru/Al<sub>2</sub>O<sub>3</sub> &gt; Ru/TiO<sub>2</sub> &gt; Ru/SiO<sub>2</sub> &gt; Ru/ZrO<sub>2</sub>. The findings reveal that MBT hydrogenation performance is governed by the synergistic interplay of multiple support characteristics rather than any single factor. This work provides an informative direction for the rational design of high-performance LOHC hydrogenation catalysts.</p>

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Efficient Hydrogenation Catalysis over Ru Nanoparticles: Investigating the Support Effects of Ultrasonic Spray Pyrolysis–Derived Al2O3, TiO2, ZrO2, and SiO2

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Toan Minh Pham,
  • Jeonghun Han,
  • Hyeonjung Kim,
  • Jonghee Han,
  • Jinsoo Kim

摘要

Liquid organic hydrogen carriers (LOHCs) have emerged as promising media for hydrogen storage and transport owing to their high hydrogen content and compatibility with existing infrastructure. However, the catalytic efficiency of Ru-based catalysts in LOHC hydrogenation is strongly influenced by the properties of their support materials, which remain insufficiently explored. In this study, Ru nanoparticles were supported on four different metal oxides (Al2O3, TiO2, ZrO2, and SiO2) synthesized via a combined sol–gel and ultrasonic spray pyrolysis (USP) process, providing continuous processes amenable to large-scale production. The resulting metal oxide supports exhibited diverse physicochemical characteristics, including variations in surface area, surface hydroxyl group concentration, and metal–support interaction strength. The Ru-supported catalysts were systematically evaluated for the hydrogenation of monobenzyl toluene (MBT), a model LOHC compound. Catalytic activity followed the trend: Ru/Al2O3 > Ru/TiO2 > Ru/SiO2 > Ru/ZrO2. The findings reveal that MBT hydrogenation performance is governed by the synergistic interplay of multiple support characteristics rather than any single factor. This work provides an informative direction for the rational design of high-performance LOHC hydrogenation catalysts.