Catalytic decomposition of nitrous oxide on metal exchange zeolites
- Air Products and Chemicals Inc., Allentown, PA (United States)
Nitrous oxide (N{sub 2}O) is now considered to be an environmental pollutant because it contributes to catalytic ozone destruction in the stratosphere and is a greenhouse gas. With increasing concerns about the environment, there is a need to develop catalytic methods to avoid emission of N{sub 2}O into the atmosphere. Earlier catalysts work produced a variety of metal oxide catalysts that were often too slow or operated at too high a temperature to be of commercial significance. The authors have discovered a family of metal loaded zeolite catalysts that have high activity and selectivity for the decomposition of N{sub 2}O into only N{sub 2} and O{sub 2}. Cu and Co exchanged ZSM-5, mordenite, zeolite beta, ZSM-11 and ferrierite are much more active than other cation-exchanged zeolites (Cu-Y, Co-Y, Co-erionite, Cu-L, Co-L, Ni-ZSM-5, Mn-ZSM-5) and metal oxides (CuO/Al{sub 2}O{sub 3}, and CoO/Al{sub 2}O{sub 3}). These improved catalysts readily destroy N{sub 2}O at both low (ppm) and high (30%) levels in the presence of 2% water vapor. The catalysts possess remarkable life and stability over a broad temperature range. The authors shall focus on the performance of these catalysts under a variety of process streams.
- OSTI ID:
- 142018
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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