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Catalytic Decomposition of N2O over NaY-Supported and USY-Supported Rh Catalysts

K. Yuzaki, T. Yarimizu, K. Aoyagi, S. Ito, T. Sato, S. Hayashi, and K. Kunimori
[Proceedings of the 12th International Zeolite Conference, Vol. 4, pp. 2863-2868, 1999]

The catalytic decomposition of nitrous oxide to nitrogen and oxygen has been studied over zeolite (NaY, USY) supported rhodium catalysts. Rh/USY catalysts were more active than Rh/NaY catalysts, and the activity of N2O decomposition was increased by the precalcination at 700C of the zeolite support (NaY, USY). The precalcination effect was more significant for Rh/NaY catalysts. The results were discussed in terms of characterization of the catalysts using H2 and CO chemisorption and 29Si and 27Al NMR, as partly shown in Fig. 1.


Fig. 1. 27Al MAS NMR spectra of NaY zeolite (A) and USY zeolite (B) calcined at the temperature indicated in the bracket. Numbers on the peak indicate the coordination number.

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