Effect of structural properties of mesoporous Co₃O₄ catalysts on methane combustion

Abstract

Highly ordered 2D and 3D-Co₃O₄ catalysts were prepared using SBA-15 and KIT-6 as templates. Nano-Co₃O₄ catalyst was obtained by calcination of cobalt nitrate as a comparison. The BET surface area of nano- Co₃O₄, 2D-Co₃O₄ and 3D-Co₃O₄ catalysts was 16.2, 63.9 and 75.1 m²/g, respectively. All the catalysts were tested for the total combustion of methane and their catalytic performance was in order of 3D-Co₃O₄(T ₉₀=355 °C)>2D-Co₃O₄ (T ₉₀=383 °C)>nano-Co₃O₄(T ₉₀=455 °C). It was also found that the order of the areal specific reaction rates for the combustion of methane follow the same order of total activity. The characterization result demonstrated that enhanced catalytic performance of methane of the 2D-Co₃O₄ and 3D-Co₃O₄ catalysts was due to their pronounced reducibility and abundant active Co³⁺ species which was caused by the preferential exposure of {220} crystal planes in 3D-Co₃O₄ and 2D-Co₃O₄ catalysts compared to the nano-Co₃O₄.

Keywords

Mesoporous Co₃O₄ / Hard template / CH4 oxidation / KIT-6 / SBA-15

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