Title: Storage battery gas recombination catalyst device

Abstract: A lightweight catalyst body bearing a finely divided metal of the platinum group is encased in a porous PTFE shell which is impermeable to the electrolyte because of its hydrophobic surface properties. Several small bodies of this kind, each containing about 1 mg of palladium are inserted in each cell of a vehicle storage battery and float on the electrolyte surface. They not only recombine hydrogen and oxygen to water and return the water to the electrolyte efficiently, even at high ambient temperatures, but the efficiency of the catalyst is not reduced under conditions causing considerable generation of stibine. The core material on which the catalyst is provided, with or without an additional carrier, may be activated charcoal, hollow glass spheres, a porous ceramic or a synthetic resin foam. The porous hydrophobic shell may be sintered or unsintered or may be made of superimposed sintered and unsintered layers.

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Inventors: Dietz, Hermann (Gerlingen, DT)

Application Number: 469779
Filing Date: 1974-05-14
Publication_date: 1976-01-06
Assignee: Robert Bosch G.m.b.H. (Stuttgart, DT)
Primary Class(es): 502/152 422/211, 429/57, 502/527.15, 502/527.16
Other Classes:
US Patent Ref:

3102059	Aug, 1963	Harmer	136/181.
3464860	Sep, 1969	George et al.	136/179.
3701691	Oct, 1972	Sassmannshausen et al.	136/181.
3817717	Jun, 1974	Kreidl et al.	23/288.

Other Refs:
Primary Examiner: Walton, Donald L.
Assistant Examiner:
Attorney: Flynn & Frishauf