 The charcoal granules may be impregnated with the catalyst in sit or they may be purchased from UOP as pre-impregnated with the catalyst.An alkaline environment is provided by caustic being pumped into reactor on an intermittent, as needed basis.The jet fuel or kerosene feedstock from the top of the caustic prewash vessel is injected with compressed air and enters the top of the Merox reactor vessel along with any injected caustic.