ChemInform Abstract: Co3O4—SiO2 Nanocomposite: A Very Active Catalyst for CO Oxidation with Unusual Catalytic Behavior.
✍ Scribed by Chun-Jiang Jia; Manfred Schwickardi; Claudia Weidenthaler; Wolfgang Schmidt; Satu Korhonen; Bert M. Weckhuysen; Ferdi Schueth
- Publisher
- John Wiley and Sons
- Year
- 2011
- Weight
- 21 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0931-7597
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✦ Synopsis
Co 3 O 4 -SiO 2 Nanocomposite: A Very Active Catalyst for CO Oxidation with Unusual Catalytic Behavior.
-The title catalyst is prepared by addition of C-SiO2 (obtained from activated carbon and Et4SiO4 in EtOH, followed by annealing at 350 °C for 30 min in air) to an aqueous Co(NO3)2 solution, and calcination of the resulting solid at 550°C for 90 min in air (yield given in g). The samples are characterized by powder XRD, SEM, XPS, and Raman and IR spectroscopy. The material exhibits very high activity for CO oxidation even at a temperature as low as -76 °C. An unusual U-shaped curve of the temperature-dependent activity is observed under normal conditions, indicating negative apparent activation energies attributed to the adsorption of H2O molecules on the surface of the catalyst.