Abstract: A method for the chemical precipitation of metallic silver powder employs a two solution technique in which a solution of a tin salt and a solution a silver salt are mixed in the presence of an inorganic or organic acid, alumina, an anionic surfactant, and a colloid to form a precipitation solution at a temperature and pH suitable to effect the chemical precipitation of silver. Almost 80% by weight of the precipitated powder agglomerate is less than 25 .mu.m in diameter, and the individual powder particles which compose the agglomerate range in size from 0.2 to 2.0 .mu.m. In addition to the favorable size distribution, silver particles precipitated in the presence of a gelatin colloid can be used with a minimal amount of sieving so that little work hardening is imparted to the particles. The powder can be annealed at a temperature of up to 750.degree. C.

Abstract: This invention provides a passive potentiostat which is adapted to function as a self-adjustable unipolar resistive load.The passive potentiostat is suitable for controlling the half-cell potential of a thermodynamically favorable electrochemical process, e.g., a process operating in a fuel cell mode or battery mode.

Abstract: This invention provides an electrochemical process for electrogenerative partial oxidation of methyl-substituted hydrocarbons such as ethane, propylene and toluene.Ethane is oxidized to products such as acetaldehyde and acetic acid, and propylene converts to acrolein and acrylic acid.