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High surface area, active catalysts containing dispersed catalytic platinum nanoparticles(dp~11.6 nm) on a cordierite substrate were fabricated and characterized usingTEM, XRD, and SEM. The catalyst activity was evaluated for methanol oxidation. Experimentalresults were obtained in a miniature-scale continuous flow reactor. Subsequentstudies on the effect of catalyst loading and reactor flow parameters are reported. Repeat tests were performed to assess the stability of the catalyst and the extent ofdeactivation, if any, that occurred due to restructuring and sintering of the particles. SEM characterization studies performed on the postreaction catalysts following repeattests at reasonably high operating temperatures (~500°C corresponding to ~0.3Tm for bulk platinum) showed evidence of sintering, yet the associated loss of surface area had minimal effect on the overall catalyst activity, as determined from bulk temperaturemeasurements. The potential application of this work for improving catalyticdevices including microscale reactors is also briefly discussed.

Catalysis of Methanol-Air Mixture Using Platinum Nanoparticles for Microscale Combustion