Abstract
Herein we report on the synthesis, characterization and catalytic evaluation of cobalt (Co) and tin (Sn) oxide catalysts synthesized via the sol–gel approach. Preliminary characterization using nitrogen sorption measurements show the materials as mesoporous with relatively high surface area. The catalyst with the least amount of Co had the highest surface area (146 m2/g) compared to the catalysts with the highest amount of Co. Furthermore, temperature-programmed reduction (H2-TPR) was used to study the redox properties of the catalysts. The H2-TPR analysis revealed that the catalysts are only reduced at relatively high temperatures (> 300 °C). While the temperature-programmed desorption using ammonia (NH3-TPD) and carbon dioxide (CO2-TPD) results suggest that the total amount of acidic and basic sites is the function of different amounts of metal content in the catalytic materials. The catalyst with the least amount of Co appeared to have the highest number of acidic sites compared to other catalysts. Evaluation of the catalytic activity was studied using oxidation of morin as model reaction. The catalyst with the least amount of Co, (Co0.3Sn0.7Ox) appeared to be the most active catalyst.
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Acknowledgements
This work is based on the research supported in part by the National Research Foundation of South Africa (Grant Specific Unique Reference Number (UID) 85386). The authors would like to thank the University of Johannesburg for funding. We would like to thank Shimadzu South Africa for use of their instruments.
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Bingwa, N., Ndolomingo, M.J., Mabate, T. et al. Surface Property-Activity Relations of Co/Sn Oxide Nanocatalysts Evaluated Using a Model Reaction: Surface Characterization Study. Catal Lett 149, 2940–2949 (2019). https://doi.org/10.1007/s10562-019-02819-2
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DOI: https://doi.org/10.1007/s10562-019-02819-2