Homogeneous ignition of H2/CO/O2/N2 mixtures over palladium at pressures up to 8 bar

Abstract The catalytic and gas-phase combustion of fuel-lean H2/CO/O2/N2 mixtures over palladium was investigated experimentally numerically at a global equivalence ratio φ = 0.285, H2:CO volumetric ratios 1-4, pressures 1-8 bar catalyst surface temperatures 950-1200 K. In situ planar laser induced fluorescence (PLIF) the OH radical monitored homogeneous inside channel-flow reactor, while 1-D Raman measurements main species concentrations across channel boundary layer assessed heterogeneous processes. Simulations were carried out with 2-D numerical code using detailed chemical reaction mechanisms realistic transport. simulated measured transverse profiles attested to transport-limited conversion H2 CO all operating conditions. OH-PLIF simulations confirmed establishment appreciable only for p