Bunsen reaction simulation and experimental study of the decomposition of hydrogen iodide thermochemical sulfur- iodine cycle Hydrogen
|Keywords||thermochemical iodine-sulfur(IS)cycle Bunsen reaction hydrogen iodine thermodynamic kinetics|
Drawbacks to fossil fuel utilization include limited supply and pollution. Hydrogen is a environmentally attractive transportation fuel that has the potential to replace fossile fuels. Thermochemical water-splitting is the conversion of water into hydrogen and oxygen by a series of thermally driven chemical reactions. Bunsen reaction and hydrogen iodide decomposition in IS（iodine-sulfur） cycle, the most industrialized thermochemical cycle was studied.Firstly, the thermodynamic equilibrium of Bunsen reaction and hydrogen iodide decomposition were examined. The effect of reactant ratio、 temperature and pressure on the thermodynamic equilibrium of Bunsen reaction were discussed and the effect of temperature、 pressure、 membrane reactor and vapor on the thermodynamic equilibrium of hydrogen iodide decomposition were discussed too. The results are helpful to find the proper condition of Bunsen reaction and hydrogen iodide decomposition.Secondly, separation characteristics of 2 liquid phrase and side-reactions from HI、 H2SO4、I2 were investigated experimentally in operating temperature range,from 20℃ to 70℃. The effects of solution temperature 、acid concentration and iodine concentration on separation characteristics of 2 liquid phrase and side-reactions were discussed. Iodine concentration at the point where the solution starts to separate were determined.Thirdly, a dynamic model of homogeneous decomposition of hydrogen iodine were put forward and kinetic simulation of hydrogen iodine homogeneous decomposition was made on different reactive time、 temperature（range from 300°C to 900°C） and pressure.At last, 5 Pt catalysts was successfully prepared by the Sol-Gel method. The composition, microgram and pore size distribution of 6 catalysts（including 5 Pt catalysts and zeolite） are studied by the XRD and Nitrogen adsorption method. The homogeneous and catalytic decomposition of hydrogen iodine were studied experimentally with a tube type electric furnace. The conversion of hydrogen iodine was examined on different temperature.