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Palladium Nanoparticles Supported on Surface‐Modified Metal Oxides for Catalytic Oxidation of Lean Methane

Li, Cunshuo and Li, Wenzhi and Chen, Kun and Ogunbiyi, Ajibola T and Zhou, Zean and Xue, Fengyang and Yuan, Liang (2020) Palladium Nanoparticles Supported on Surface‐Modified Metal Oxides for Catalytic Oxidation of Lean Methane. Applied Nano Materials, 3 (12). pp. 12130-12138.

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Palladium nanoparticles (NPs) were successfully deposited on surface‐modified metal oxides (mod‐ MOx, M = Hf, Ti, Zr, Ce, and Al) and applied as catalyst materials for lean methane combustion. It was found that the surface modification of support materials improved the light‐off performance of 1.0Pd/mod‐HfO2 (palladium catalyst supported on surface‐modified HfO2 with a content of 1.0 wt %), 1.0Pd/mod‐ZrO2, and 1.0Pd/mod‐CeO2, but lowered the purification efficiency of 1.0Pd/mod‐ TiO2 and 1.0Pd/mod‐Al2O3 when compared with their 1.0Pd/MOx counterparts. Over the bestperforming 1.0Pd/mod‐HfO2 material, 90% of methane was removed at 317 °C and a space velocity of 60 000 mL g–1 h–1, which was 120 °C lower than that required for the untreated 1.0Pd/HfO2 sample. Detailed characterization of representative HfO2‐related materials showed that the introduced silicon modifier materials, which existed as an amorphous phase covering the HfO2 surface, could improve the dispersion of palladium nanoparticles due to their steric confinement and strengthen the generation of surface‐adsorbed oxygen species via electron transfer. We believe that this surface modification strategy, which could promote the catalytic performance of palladium nanoparticles supported on other cost‐effective host materials as well, provides a feasible method for the design of methane combustion catalysts with excellent lowtemperature performance.

Item Type: Article
Uncontrolled Keywords: palladium  surface modification  silicon modifier  hafnium dioxide  leanShow More
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: nwokealisi
Date Deposited: 12 Oct 2023 13:27
Last Modified: 12 Oct 2023 13:27

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