HYDROGEN GENERATION FOR HIGH ALTITUDE BALLOONS
Abstract
Based on efficiency, weight, volume, and cost per charge, CaH2, pelleted NaAlH4, and NaBH4 were the most promising materials for the development of a H generating charge. LiAlH4 was substituted for NaAlH4 for large-scale testing. CaH2 and pelleted LiAlH4 were scaled up to give 42 cu ft of H smoothly and efficiently within 30 min, using the standard ML-303/TM generator. Manifolds of 4 and 6 charge cans of each of these materials were tested successfully to generate 168 and 252 cu ft of H. Accelerated aging tests indicated a questionable shelf life for LiAlH4. Because it is water-soluble, NaBH4 required an enclosed generator. Efficient generation from NaBH4 required a catalyst, preferably CoCl2. The foaming which accompanied generation was controlled by addition of a small amount of gum turpentine. As the turpentine sometimes decelerates the reaction, amines or alcohols were used to accelerate the generation rate. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 14, 1961
- Accession Number
- AD0261913