A reactor module for use in a compact fuel processor, comprising: a catalyst bed; a cooling coil positioned substantially within the catalyst bed for removing excess heat during normal operation; and an electrical heating element positioned within the cool...

Carboxylic acids or the salts thereof are suitable for use in cooling systems where low electrical conductivity is required. The compositions are of particular use in fuel cell stacks. The preferred salts are those of amines. The salts can be used with a l...