Opportunities for microgravity research in the development of practical catalytic combustion systems

Details Opportunities for microgravity research in the development of practical catalytic combustion systems Opportunities for microgravity research in the development of practical catalytic combustion systems

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..420..840k&link_type=abstract

Space technology and applications international forum - 1998. AIP Conference Proceedings, Volume 420, pp. 840-846 (1998).

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Catalytic combustion is an emerging technology that enables combustion of ultra-lean mixtures, leading to very low NOx emissions as a result of the low combustion temperatures. While it is now clear that combustion catalysts can be engineered into practical combustion systems, the essential surface-chemistry processes are not at all well understood. Therefore, optimal design and control is limited by a lack of fundamental understanding. In practical systems, the need for high catalyst surface area (e.g., a honeycomb monolith) obscures the surface itself from diagnostics probing and thus frustrates the collection of needed fundamental data. Laboratory-based experiments that use idealized geometries are required to probe the catalytic surfaces themselves and the adjacent gas-phase boundary layers. This paper develops a set of scaling laws that reveal how the effects of buoyancy restrict the use and interpretation of terrestrial laboratory-based experiments for the discovery of fundamental catalytic chemistry. The paper also shows how a microgravity environment can be used to great advantage to relax the buoyancy-included constraints of the terrestrial laboratory.

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