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Size-tailored microwave absorption and reaction activity of Co3O4 nanocatalysts
Hoang M. Nguyen,Chi M. Phan,Gia Hung Pham,Yusuke Asakuma,Robert Vagnoni,Shaomin Liu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
Microwave (MW)-assisted heterogeneous catalytic chemical reactions have opened advanced routinesover the conventional methodology. MW absorption ability of catalyst governed by its particle size is theforemost important factor to be considered before designing catalysts for such MW-based chemistry. Despite considerable interest in applying metallic-based catalysts for MW-assisted reactions, theinfluences of particle size on catalyst’s MW absorption ability and its resultant activity remain elusive. Here, we report an effective approach to tailor the MW absorption ability of Co3O4 catalyst via controllingits particle size during the crystal growth. A developed theoretical model verified that a capping agentcould regulate Co3O4 particle size effectively. For the unsupported Co3O4 catalysts, smaller particle sizepossessed higher MW absorption capacity and thereby delivered higher activity for MW-assisted bireformingof methane. High conversion of 63% CH4 and a syngas ratio (H2/CO) of 2.2 was achieved withthe smallest Co3O4 particles, at 20 nm. In contrast, the supported Co3O4 samples required larger particlesto ensure adequate exposure to the incident MW, which is partially covered by MW-inert support. Theresults disclose that by tailoring particles size appropriately, metallic-based catalysts can be optimisedfor MW-based chemical reactions.
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