Kinetics of high-temperature water-gas shift reaction over two iron-based commercial catalysts using simulated coal-derived syngases

Development and experimental validation of a water gas shift kinetic model for Fe-/Cr-based catalysts processing product gas from biomass steam gasification

“…For this operating point, the chosen value of E a was too low, which indicates that a lower STDGR ratio has a negative effect on the kinetics. This is in agreement with Hla et al [12], where the authors observed that higher steam content increased the reaction rate of the WGS reaction. However, the measurement points 3 to 5 indicate good agreement between the calculated and measured heat losses.…”

Modeling and Simulation of Water Gas Shift Reactor: An Industrial Case

“…The disadvantage of this method is that the rate expression can model successfully only a reactor with this specific type and size of catalyst. (Hla et al, 2009) estimates the intrinsic rate parameters for two commercial catalysts as can be seen in rows three and four.…”

“…Finally, it is worth mentioning that the reaction rate constants were obtained from (Hla et al ,2009) as presented in After solving the reactor model, normalized experimental CO conversion plotted against normalized CO conversion predicted values are shown in Figure 4.1.1. It can be observed that a systematic deviation occurs, probably because of the number of simplifying assumptions.…”

“…This indicates that H2O is present in such a large excess that concentration changes does not considerably affect the reaction rate (Hla et al, 2009). However, in the industrial reactor, where the feed composition may change due to the nature of a petrochemical plant, H2O may be in excess, but not in enough amount to be considered constant throughout the reactor length.…”

Water–Gas Shift Kinetics Over FeCr-based Catalyst: Effect of Hydrogen Sulphide

“…In an earlier paper [24], Hla et al had measured kinetics of the high-temperature WGS reaction over FeCr-based catalysts but their later study of the effect of H 2 S [20] was done with a fixed syngas composition and consequently did not re-evaluate the exponents of species other than H 2 S. In conclusion, no full kinetic expression valid with 20 ppmv of H 2 S has been published up till now. In the present study, the reaction kinetics for water-gas shift has been measured over a commercial FeCr-based catalyst at atmospheric pressure, at 375-475°C, with 11-35 ppmv of H 2 S. It will be demonstrated that in this region the catalyst activity is negatively affected by H 2 S. A power rate law will be presented as fitted to our experimental data.…”