Adsorption and catalytic decomposition of dimethyl sulfide on H-BEA zeolite. (16th October 2020)

• Record Type: Journal Article
• Authors: Oshima, Kazumasa; Kadonaga, Rina; Shiba, Munehiro; Sohmiya, Minoru; Satokawa, Shigeo
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 51(2020)
• Page Start: 27644
• Page End: 27652
• Publication Date: 2020-10-16
• Subjects: Desulfurization -- Dimethyl sulfide -- Solid acid catalyst -- H-BEA zeolite -- Desorption behavior; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.07.106
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Catalytic direct decomposition of dimethyl sulfide (DMS) was performed using solid acid catalysts to develop an on-site hydrogen-free desulfurization system for utilization in small systems, such as fuel cells. DMS was decomposed to CH3 SH and H2 S at 500 °C on SiO2 –Al2 O3 and various zeolite catalysts. Among the catalysts, H-BEA zeolite with Si/Al = 18.5 (H-BEA-18.5) showed the highest performance for DMS decomposition at 500 °C. While the catalytic activity at 500 °C maintained a DMS conversion of greater than 30% for up to 114 h, a large amount of carbon deposition caused gradual deterioration. At a low temperature of 400 °C, DMS decomposition to CH3 SH on H-BEA-18.5 continued for 100 h with a stable conversion of approximately 30%, although the adsorption of DMS on the catalyst surface was also confirmed. To achieve a high performance for the DMS decomposition, high temperatures were required to avoid the adsorption of sulfur species. Graphical abstract: Image 1 Highlights: Dimethyl sulfide was decomposed to CH3 SH and H2 S on solid acid catalysts. H-BEA-18.5 showed the highest performance for DMS decomposition. Adsorption of sulfur species on the acid site inhibited the reaction. Carbon deposition caused deterioration in the reaction over long time spans.