Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-III-6(T p ) was taken as an index of the catalytic activity of each tested catalyst. CeO 2 , LaFeO 3 andMnCr 2 O 4 catalysts showed the best performances with a lowering of the T p of about 150-200°C, from 500°C to about 300°C (a temperature easily reached in real conditions)compared to the uncatalytic runs.Moreover, a very high selectivitytowards CO 2 conversion was observedfor the catalytic runs respect to theuncatalytic one.The best tested catalysts were thendeposited on an appropriate substrate:vast majority of oven muffle liners aremade by carbon steel sheets protectedby enamel, typically made by oreFig. 1. SEM view of the ceria catalytic layer deposited byaluminosilicates. Samples of steelin-situ SCS onto the Ferro enamel - Perc TM sheet.sheet coated by commercial Ferro enamel - Perc TM - were used as support for catalystdeposition experiments. Both in-situ spray pyrolysis and SCS were selected for the depositionof the catalyst on enamel. Obtained catalytic layers were characterized by SEM (ScanningElectron Microscopy) and XRD (X-Ray Diffractometer), to assess integrity, adhesion onenamel and obtained phases (Fig. 1).Catalytic layer activity towards reference fatty acids oxidation was investigated via TPCexperiments using an appropriate reactor: fatty acids were deposited on catalyzed enameledsteel sheet strips, using bare enamel as a reference. Also, catalytic efficiency towards naturalfat substances (olive oil, pork lard, butter) was tested: solid and liquid natural fats aresubjected to significant variance and natural degradation, hence comparative test wereperformed on samples from a common stock.Finally, 50 mm wide square samples were coated by the most promising catalysts andlocated on a drip pan, to perform a cooking cycle simulation (250 °C for 60’; soiling by oliveoil at target temperature reach) in a standard oven; weight loss, aesthetic appearance,cleanability were benchmarked versus bare drip pan enamel surface. Significant positivedifferences, resulting in a clearly perceivable self cleaning effect, were observed on thecatalyzed samples.References1. P. Palmisano, N. Russo, P. Fino, D. Fino, C. Badini, Applied Catalysis B: Environmental, 69 (2006) 85.314