The effect of low concentrations of CO on H2 adsorption and activation on Pt/C: Part 2-In the presence of H2O vapor

► Presence of H2O has no effect on the strongly bound chemisorption of H2 on Pt/C. ► Adsorption of strongly bound H2 and H2O is totally additive. ► No evidence of dissociative adsorption of H2O on Pt/C at experimental conditions. ► Steady-state CO surface coverage on Pt/C is the same regardless of presence of H2O. ► Presence of H2O appears to slow kinetics of CO adsorption.