Ortho-Parahydrogen Conversion Studies
Quantity production of liquid parahydrogen has been accomplished at the NBS-AEC Cryogenic Engineering Laboratory through use of a chromic oxide catalyst placed in the liquid receiver at the bottom of the hydrogen liquefier. (See Figure 1.) About 175 pounds of a commercial 20 percent chromic oxide on alumina or 100 pounds of a 30–35 percent chromic oxide on gel alumina are required to produce 95 percent parahydrogen at liquefaction rates of 210 to 240 liters per hour. It was found that nitrogen contamination of the chromic oxide catalyst does not influence its conversion activity whereas atmospheric air at room temperature definitely acts as a catalyst poison.1
KeywordsChromic Oxide Liquid Hydrogen Percent Nickel Chamber Geometry Ammonium Nitrate Solution
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