Technical Paper
Sulfur Impact on Methane Steam Reforming over the Stoichiometric Natural Gas Three-Way Catalyst
2024-04-09
2024-01-2633
The steam reforming of CH4 is crucial for the high-temperature activity of natural gas three-way catalysts. Although there are reports of sulfur inhibition in CH4 steam reforming activity, there is a limited understanding of sulfur storage and removal dynamics under different lambda conditions. In this study, we demonstrate the impact of sulfur on CH4 steam reforming by examining CH4 conversions on the three-way catalyst under dithering, rich, and lean conditions in the reactor and investigating the status of precious metals on the sulfated three-way catalyst using DRIFTS. Empirical data are used to develop a global kinetic model that describes CH4 conversion at different lambda conditions on a natural gas three-way catalyst saturated with sulfur. Experimental data under dithering conditions demonstrate that in the absence of sulfur, CH4 is fully converted at high temperatures, producing H2.