Preparation Sequence of MoS ₂ /γ‐Al ₂ O ₃ Catalysts with Plasma Fluidized Bed for Sulfur Tolerant Methanation

Abstract The sulfur‐tolerant coal‐to‐gas conversion process demonstrates notable advantages in process simplicity and environmentally friendly features. Developing high‐efficiency sulfur‐tolerant methanation catalysts remains critical for advancing this technology. Traditional plasma catalyst preparation methods employ fixed‐bed operations, resulting in uneven catalyst surface properties and scalability concerns. To address these challenges, this study proposes an innovative approach to optimize sulfur‐tolerant methanation catalysts through the implementation of plasma‐fluidized bed reactor technology. The research focuses on sequential plasma treatment and calcination for catalyst preparation, followed by stability evaluation. The catalysts were characterized using N 2 physical adsorption, XRD, TGA, Raman, NH 3 ‐TPD, XPS, and TPR in order to elucidate catalyst properties. The results indicate that the catalysts prepared in the plasma fluidized bed reactor exhibited initial CO conversion of 33.6%. Furthermore, during the 30‐h stability test, the prepared catalysts initially demonstrated good stability, with an observed decrease in activity from 33.6% to 31.7%, representing a 5.7% relative decrease in performance.