Catalytic abatement of nitrous oxide from fluidized bed combustion
Simultaneous control of N{sub 2}O and other gas pollutants (NO{sub x}, SO{sub x}) during fluidized bed combustion is a task hard to undertake. Moreover, thermal N{sub 2}O decomposition requires temperatures above 900 K; the alternative is to carry out a catalytic process in which the temperature is considerably lowered. In this sense, heterogeneous catalytic decomposition seems to be a promising option for N{sub 2}O removal downstream of the combustor. The high flow rates involved in fluidized bed combustion make the use of honeycomb structures with a low pressure drop necessary, like monoliths coated with an appropriate active catalyst. Zeolites seem to be suitable for this application, since high catalytic activity per reactor volume is achieved due to their high activity and specific surface, and consequently the volume of the catalytic reactor is smaller. In addition, zeolites present high catalytic activities at low temperatures. Therefore, these are appropriate to be used in low dust configuration where temperature is around 300--400 C, so both gas flow rate and required reactor volume are diminished. Fluidized bed combustion off-gases contain also other pollutants, which can affect N{sub 2}O catalytic destruction. Therefore, all applicable catalysts have to satisfy the requirements of high activity and stability at the conditions of application. The authors summarize here experimental results obtained by CIEMAT in the framework of a European research project dealing with the development of catalytic technologies to eliminate N{sub 2}O. The aim of this work is to study stability and durability of selected catalysts in the presence of both simulated and real combustion off-gases under operating conditions reproducing those typical for fluidized bed combustion, as well as to obtain all necessary data for scale-up and techno-economic evaluation of selected technologies.
- Research Organization:
- Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid (ES)
- Sponsoring Organization:
- European Union (EU)
- OSTI ID:
- 20013464
- Resource Relation:
- Conference: 24th International Technical Conference on Coal Utilization and Fuel Systems, Clearwater, FL (US), 03/08/1999--03/11/1999; Other Information: PBD: [1999]; Related Information: In: The proceedings of the 24th international technical conference on coal utilization and fuel systems, by Sakkestad, B.A. [ed.], 1091 pages.
- Country of Publication:
- United States
- Language:
- English
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