EXPERIMENTAL EVALUATION OF PRECIOUS METAL CARBON DIOXIDE CATALYSTS.
Final technical rept. Jun 66-Apr 67,
ENGELHARD INDUSTRIES INC NEWARK NJ RESEARCH AND DEVELOPMENT DIV
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A study was undertaken for the development of a catalyst for the Sabatier carbon dioxide methanation reaction. This reaction is used in an oxygen recovery process for space capsules. The best catalyst developed consists of 20 ruthenium supported on alumina spheres of 70 to 100 m sqg surface area. Conversions of 99 and higher were reached with such catalysts at space velocities up to 10,000 per hr when using 10 stoichiometric excess hydrogen and temperatures of 470 to 530 F. The carbon monoxide concentration of the dry product gas can, under the same conditions, be kept at 10 ppm. At lower and higher temperatures, the conversions decline because of kinetic and thermodynamic limitations, respectively. A catalyst of the same type was run continuously for 3,024 hours at a space velocity of 500 per hour and a temperature of 527 F without any noticeable decline in the 99 conversion to methane while using 10 excess hydrogen in the feed. Author
- Physical Chemistry
- Unmanned Spacecraft
- Life Support Systems