Electrical-conductance responses of catalysts exposed to pulses of H2 and O2

Abstract

A computer-controlled gas-mixing system has been used to contact alternating hydrogen and oxygen pulses in an argon carrier with various catalysts at 400 °C. A simple pulsing sequence was used to obtain an oxidation–reduction pattern for each catalyst so that composition-related differences in conductance response could be observed. Catalyst groups studied were: alkali-promoted Fe₂O₃, multicomponent Fe–Sb–Ti–Mo oxides and Co supported on Al₂O₃. Results are discussed with respect to how the pulsing technique can be used for investigating the effect of promoters in oxide matrices, for comparison of granularities and in quality-control applications.