1. Introduction The packed bed reactor can apply to various processes, including adsorption, leaching, ion exchange, and catalysis. Consequently, over the past ten years, one of the leading research areas in chemical engineering has been mass transfer in packed beds. However, only a few mass transfer studies have been made using electrochemical techniques. Hanratty [1,2,3,4,5,6] developed an electrochemical technique to study the mass transfer phenomena in packed bed reactors.
