A new method for preparing metal-supported catalysts using microemulsion was applied to the platinum-alumina catalysts employed for the NO-CO reaction, and the effects of time of platinum particle preparation on the reaction were investigated. Two catalysts were prepared in different time intervals of 0 min and 10 min, and the size of the platinum particle sizes of these catalysts after calcination in air was measured using XRD. In the case of 0 min preparation time, the platinum particle size was smaller than 3 nm after calcination at 400°C, but it became 12 nm after calcination at 700°C. On the other hand, in the case of 10 min, it was about 10 nm at 400°C and 12 nm at 700°C. In the NO-CO reaction over these two catalysts, the NO conversions at low temperatures were almost the same, but the NO conversion and N2 selectivity above 340°C were different over these catalysts. The catalyst prepared in 0 min showed low NO conversion and low N2 selectivity, but that prepared in 10 min showed high NO conversion and high N2 selectivity. With the catalyst prepared in 0 min, the platinum particles became anisotropic in shape, and their crystal surfaces, which have high NO dissociation activity decreased, however, with that prepared in 10 min, the platinum particles and their crystal surface activity did not drastically change because the platinum particles were partially embedded in γ-alumina formed by ME Method.
|Number of pages||1|
|Journal||Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute)|
|Publication status||Published - Dec 1 1999|
All Science Journal Classification (ASJC) codes
- Fuel Technology
- Energy Engineering and Power Technology