Pt/zirconia catalyst for hydrogen generation from HI decomposition reaction of S-I cycle

Abstract

Summary Hydrogen energy is considered as one of the ideal solutions for the fulfilment of the ever increasing energy demand. It is mainly due to the following two reasons: firstly, it can be produced from a very abundant source, that is, water; and secondly, it does not leave any harmful effect on the environment. Thermochemical cycles are amongst the most promising ways to generate hydrogen from water in an environment‐friendly manner. Sulfur–iodine cycle is one of the most efficient thermochemical cycles. In this paper, we discuss synthesis of Pt/zirconia catalysts for HI decomposition reaction, which is one of the important steps of S–I thermochemical cycle. The catalysts were characterized by X‐ray diffraction, scanning electron microscopy (SEM), field emission gun‐SEM, transmission electron microscopy, N2 adsorption and H2 chemisorption. The catalytic activity and stability of these catalysts, for liquid phase decomposition of hydriodic acid was evaluated. Conversion is found to be dependent on the noble metal loading, with 18.7% conversion for 2% Pt/ZrO2 catalyst as compared with 2.7% of without catalyst, although the specific activity is highest for 0.5% Pt/ZrO2 catalyst. The catalyst was found to be stable under liquid phase HI decomposition reaction conditions. Copyright © 2014 John Wiley & Sons, Ltd.

Pt/graphite catalyst for hydrogen generation by HI decomposition reaction in S-I thermochemical cycle

“…Reactive distillation has an advantage of combining reaction and separation in a single step leading to overall shift of equilibrium towards production of I 2 and H 2 . Pt based catalysts supported on different supports like carbons [27][28][29][30] and oxides [31][32][33][34] have been used as catalysts for HI decomposition reaction during this process. There are few reports on use of nickel based catalyst systems also [35,36].…”

“…In earlier studies, we had studied platinum compared supported platinum catalysts with varying nature of porosity of carbon supports, i.e. microporous and mesoporous [27] and mesoporous zirconia support [34]. In the current study we plan to extend the studies to catalyst based on platinum supported on planar carbon support.…”

Hydrogen-iodide decomposition over Pd CeO 2 nanocatalyst for hydrogen production in sulfur-iodine thermochemical cycle

“…Precious metal based catalysts (supported Pt, Pd, and Ir catalysts) have also been studied extensively for this reaction [11,17,18]. Few reports have shown that the activity of Pt supported catalyst was influenced by the support [19].…”

Low-temperature CO oxidation over Cu/Pt co-doped ZrO2 nanoparticles synthesized by solution combustion

“…Recently, ZrO 2 has been used as a catalyst and support in different catalytic reactions such as solid-oxide fuel cells, ethanol reforming, hydrogen generation and hydrogenation [13–17]. It is reported to be more inert in acidic reaction environments [18] and a better catalyst/support than other materials such as SiO 2 , TiO 2 , and Al 2 O 3 [19]. Recently, we reported the usage of ZrO 2 and Pt-doped ZrO 2 nanoparticles for CO oxidation [20].…”