An electrochemical measuring system has been developed for studying metal catalysts in contact with hydrogen and vapor-phase reactants at temperatures above 100 °C. The measuring system is a special galvanic cell in which the catalyst itself functions as measuring electrode. The electromotive force (emf) of this cell is continuously recorded in the course of catalyst activation and catalytic reactions. The system has been used for studying supported nickel, palladium, and platinum catalysts in tube reactors. Based on the presumed electrode processes taking place in the measuring cell, emf values measured with different catalysts and changes in the emf values taking place under the effect of various factors acting on the surface concentration of hydrogen (partial pressure of hydrogen, temperature, concentrations of reactants, catalyst poison, catalyst deactivation) have been interpreted.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry