Accession Number:

ADA626193

Title:

Laboratory Studies of Hydrogen Gas Generation Using the Cobalt Chloride Catalyzed Sodium Borohydride-Water Reaction

Descriptive Note:

Final rept.

Corporate Author:

SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA

Report Date:

2015-07-01

Pagination or Media Count:

40.0

Abstract:

SSC Pacific conducted experiments using the CoCl2 catalyzed NaBH4H2O system to generate hydrogen gas. For the reaction to complete in a reasonable time, either distilled or deionized water should be used. The minimum ratio of H2ONaBH4 that could be tolerated was 4.61. We found that the reaction rate could be controlled by varying the flow rate of water through the Cu cooling coils, or by keeping the flow rate constant and automatically turning the cooling onoff upon reaching a set temperature. Measurements showed that the temperature of the reacting solution was inhomogeneous and hotter at the airreagent interface. Consequently, placement of the monitoringcontrolling thermocouple influences control of the reaction. Experiments conducted under pressure showed that pressure suppresses foaming. The lessons learned from these experiments provide guidance on how to control hydrogen gas generation to inflate lighter-than-air vehicles and we are implementing these findings in large-scale testing of hydrogen generation modules now underway.

Subject Categories:

  • Inorganic Chemistry
  • Hydraulic and Pneumatic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE