Influence of indium content on the performance and stability of Pd-Ir/C catalysts for the decomposition of hydrogen iodide in the iodine-sulfur cycle

摘要

In this paper, a series of bimetallic palladium-iridium catalysts supported on active carbon (Pd-Ir/C) were prepared by the impregnation-reduction method. Effects of the composition on the performance and stability of bimetallic catalysts in the decomposition of HI were investigated. X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Bru-nauer-Emmett-Teller (BET) surface area were employed to characterize their structure, morphology and surface area, respectively. The results of activity tests indicated that all the bimetallic Pd-Ir catalysts were more active than the monometallic 5% Pd/C and 5% Ir/C catalysts at both 400℃ and 500℃. Among Pd, Ir and binary Pd-Ir catalysts, the 4% Pd-1% Ir/C was the most active for HI catalytic decomposition at 400℃. Due to the low cost, high activity and good stability, the carbon supported bimetallic Pd-Ir catalysts are more potential candidates to replace Pt/C for HI decomposition in the IS thermochemical cycle.