Abstract
Devising an effective strategy to refine the physicochemical properties of Co3O4 and tune the Ag-Co interaction is pivotal for developing superior Ag-Co3O4 catalysts targeting VOCs abatement. In this study, nanosized Co3O4 and Ag-Co3O4 (Ag content of 0.5–5.0 wt%) catalysts were prepared via a facile one-pot urea combustion method. The as-prepared catalysts were characterized using various techniques and their performance in propane total oxidation was evaluated. Compared to its counterpart obtained through the direct decomposition of cobalt nitrate, the nanosized Co3O4 exhibited a larger surface area, more oxygen vacancies, better reducibility, and thus superior propane oxidation activity. The addition of Ag can further enhance the catalytic performance by significantly improving the redox properties of Co3O4. The best performance was achieved with the catalyst 3.5 wt% Ag-Co3O4, which mineralized 90 % of propane into CO2 at 200 °C and exhibited excellent cycling stability and long-term durability. In addition, 3.5 wt% Ag-Co3O4 demonstrated high activity under various conditions, including high propane concentration (6000 ppm), high space velocity (160,000 mL g−1h−1), and high water content (10 vol%), making it a promising candidate for practical VOCs removal.
Published Version
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