Impact of Feed Gas Impurities on CO₂ Methanation Catalysts and Strategies for Improving Their Tolerance

Abstract

CO₂ methanation over Ni-based catalysts was studied under conditions simulating steelworks off-gas with trace H₂S. Sulfur in the feed gas deactivated the catalyst, but high-pressure operation suppressed the deactivation. Highly crystalline Ni formed under these conditions may enhance sulfur tolerance. High-temperature calcination also improved crystallinity and durability.