Enhanced catalytic combustion of complex VOCs over Ru/Ni-HAP catalyst : Insights into the synergic effects of Ru and Ni species

Wang, Yu and Jiang, Yijun and Yuan, Yangyang and Xu, Li and Sun, Wanting and Wu, Si and Qingmiao, Wang and Hu, Ning and Wang, Li (2025) Enhanced catalytic combustion of complex VOCs over Ru/Ni-HAP catalyst : Insights into the synergic effects of Ru and Ni species. Journal of Alloys and Compounds, 1010: 177610. ISSN 0925-8388

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Abstract

In this study, Ni was severed as a promoter and impregnated on hydroxyapatite (HAP) to prepare a Ni-doped HAP support, and then Ru was highly dispersed onto the Ni-HAP through urea precipitation method. The synergistic effects between Ru and Ni caused a reduction in the particle size of Ru nanoparticles and an increased Ru4+/Ru0 ratios, which was primarily attributed to the strong interaction between the active components and functional groups of OH- and PO4 3-. Meanwhile, Ru/Ni-HAP possessed the highest amount of medium-strength acid sites and relatively low reduction temperatures, indicating the critical balance between acidity and redox capability. Ru/Ni-HAP exhibited superior activity with complete conversion of toluene at 280 °C and DCM at 400 °C, respectively, and such high activity can be maintained throughout the stability tests. Besides, optimal catalytic performance was observed under 600 ppm concentrations of toluene and DCM with a space velocity of 40,000mL(g·h)-1. These findings can provide valuable insights for the development of chlorine-resistant catalysts with promising application prospects.