Stability of the Molecular Sieve Structure in Hostile Environments
NAVAL RESEARCH LAB WASHINGTON DC
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Proposals for the use of molecular sieves as regenerable CO2 andor H2O absorbers in closed spaces have usually been based on their demonstrated efficiencies in pure atmospheres. The previously unknown effect of thermal cycling in more hostile environments containing a nominally stable halogenated hydrocarbon has been investigated. While the test halocarbon dichlorodifluoromethane was not itself deleterious, the acid products resulting from the molecular sieve-promoted decomposition of the compound caused structural damage to the sieves, which severely affected their capacities for CO2 and H2O. Sieves of the 5A and 10A type were investigated under a variety of conditions, with the 5A sieve being the more resistant to damage.
- Life Support Systems