Study on Elimination Techniques of Trace Contaminants for CELSS (Part II)
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概要
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Experiments to elucidate effects of temperature on elimination properties of catalyst filter, of which main components were Copper and Manganese oxide and aluminosilicate, for typical contaminants in controlled ecological environment were carried out. Results of experiments for dimethyl sulfide and trimetyl amine with 100ppm of inlet concentration and 12859hr-1 of space velocity showed that elimination efficiency, average change rate of elimination efficiency, and total weight of eliminated contaminants were increased with increasing temperature ranging from 25t to 250°C. Although, effects of temperature for methyl mercaptan on these properties was not significantly actualized in the experimental conditions due to high efficiency at 25°C generation of condensation products, such as, dimethyl disulfide and dimethyl trisulfide was not detected at 150°C and 250°C of the experimental temperature. Typical behavior of an abrupt catalytic deactivation occurred in experiments for hydrogen sulfide and ammonia with the condition of 500ppm inlet concentration and 12859hr-1 of space velocity. In case of hydrogen sulfide, manganese sulfide was contained in the resultant catalyst filter, and elemental sulfur were observed in a ceramic pipe in which the samples were installed. Any change of outward appearance of the resultant catalyst filters set in the experiment for ammonia was not observed. An oxidation of contaminants containing sulfur to elemental sulfur, being typical catalytic, poison via manganese sulfide could be the main cause of catalytic deactivation of the filter. Through the all experiments, no different contaminant was converted from the inlet contaminants by the catalyst filter, except condensation products of methyl mercaptan at 25°C. Evaluation of the properties revealed in the experiments derived that control of operation temperature is a promising method for the application of the catalyst filter to CELSS.
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