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- W2324397884 abstract "Present designs for scramjet-powered hypersonic missiles employ simple rocket boosters to bring them up to minimum operating speeds where a dual-mode ram/scram engine can take over. However, the low air pressures and temperatures and the very short residence times make scramjet ignition at altitude difficult. Various methods to improve ignition and flame holding have been used with some success. However, all methods have limitations and therefore improved technologies are still needed. One way to improve scramjet ignition and performance would be to utilize the mixture of 33% O2 and 66% N2 produced from N2O decomposition. N2O decomposition to N2 and O2 is a very exothermic reaction, and the heat produced is sufficient to generate product temperatures of 1300°C (2400°F). Unfortunately, N2O is a relatively stable compound and it needs to be heated to about 800°C (1470°F) to begin decomposing in the gas phase. In addition, N2O can decompose into NO and N2, which is an endothermic reaction and therefore this process would not be beneficial for ignition. However, employing a catalyst could solve both of these problems. Catalysts can reduce the temperature required for reaction and they can also direct the reaction along the desired pathway. Therefore, in this SBIR Phase I project, Reaction Systems’ objectives were to identify catalyst formulations that are active for N2O decomposition under representative conditions, characterize their activity and thermal stability, and produce a kinetic model that can be used to predict rate as a function of N2O partial pressure and temperature. The results obtained in this project showed that our catalysts can meet the demanding criteria needed to take this technology from the laboratory to a vehicle. We demonstrated that our catalysts were extremely active for the reaction at low temperatures. They reduced the temperature required for reaction to occur by over 600°C compared to results obtained without catalyst. In addition we found that our catalysts were highly selective for N2 and O2. On the other hand without catalyst, we obtained N2 but very little O2 in the products, suggesting that gas phase N2O decomposition follows the endothermic pathway, producing N2 and NO. Finally, we generated a kinetic model, which accurately predicted N2O decomposition rates over a wide range of temperatures and pressures." @default.
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- W2324397884 date "2010-07-25" @default.
- W2324397884 modified "2023-09-27" @default.
- W2324397884 title "Development and Testing of a High Temperature N2O Decomposition Catalyst" @default.
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- W2324397884 doi "https://doi.org/10.2514/6.2010-7128" @default.
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