Inverter Power Range Control for Balanced Converter Assemblies

A protective layer comprising at least one metal oxide is formed on the catalyst to act as an intermediary barrier. This protective layer prevents direct contact between sulfur in the gas phase and the catalyst active sites, thereby preventing sulfur poisoning while allowing the water-gas shift reaction to proceed. The protective layer also stabilizes the catalyst against thermal sintering at elevated temperatures.

The invention changes the operational parameters by introducing a two-stage temperature profile. The first converter operates at a lower temperature (200-400°C) optimized for high conversion efficiency, while the second converter operates at a higher temperature (400-600°C) to handle remaining conversion. This parameter change allows the system to achieve complete conversion at practical converter dimensions while maintaining high space velocity capability.

The conversion process is segmented into two distinct stages using two separate converter assemblies. The first converter operates at lower temperature (200-400°C) where the catalyst maintains structural integrity and avoids sintering, achieving the majority of CO conversion. The second converter operates at higher temperature (400-600°C) to complete the conversion of remaining CO and unreacted water, but is protected from catalyst damage by the pre-conversion in the first stage and the protective layer design.

The protective layer is designed as a porous metal oxide structure that provides selective permeability. The porous structure allows small gas molecules (CO, H2O, H2, CO2) to diffuse through while the metal oxide composition and pore structure are optimized to block larger sulfur-containing molecules. This approach achieves catalyst protection without requiring complex multi-layer structures, as the porous metal oxide inherently provides both permeability and selectivity.