NH₃-Induced Challenges in CO₂ Hydrogenation over the Cu/ZnO/Al₂O₃ Catalyst.

ABSTRACT: Gas sources rich in CO₂ derived from biomass/waste gasification, anaerobic digestion, or industrial carbon capture often contain impurities such as H₂S, H₂O, and NH₃, which can significantly hinder catalyst performance. Here, we show the role of NH₃ on the reverse water-gas shift (RWGS) reaction over a commercial Cu/ZnO/Al₂O₃ catalyst, examining its effects on both the catalytic activity and the catalyst structure. We found that NH₃ reversibly decreases CO₂ conversion immediately by suppressing carbonate hydrogenation and CO desorption. This effect intensifies with an increase in NH₃ concentration but decreases at higher temperatures. However, prolonged exposure (over 100 h) to RWG

SUBMITTER: Bie X 

PROVIDER: S-EPMC11937992 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature