Study on the High-Performance Catalyst for Sulfuric Acid Decomposition in the IS Cycle

Abstract

AbstractThe iodine-sulfur cycle coupled with a high-temperature gas-cooled reactor is a clean and efficient hydrogen production technology. The sulfuric acid decomposition reaction is the highest temperature process in the iodine-sulfur cycle, which requires 850 °C high temperature and catalyst to carry out at a high conversion rate. This study prepared a series of loaded sulfuric acid decomposition catalysts using anatase TiO2 and Ta2O5 as catalyst carriers and precious metal Pt as the active component. XRD, BET, and ICP-MS characterization of the catalysts demonstrated that the high calcination temperature could increase the crystallinity and content of the active components and decrease the specific surface area of the catalysts. The Pt/TiO2-850 catalyst showed good performance under different feed concentrations, reaction temperatures, and particle sizes. In addition, the scale-up production does not affect the Pt/TiO2-850 catalyst reaction performance. The Pt/TiO2-850 catalyst was tested in a bayonet-tube SiC reactor with a 100-h high throughput lifetime, which proved that the Pt/TiO2-850 catalyst has good stability.