In-Situ FT-IR Monitoring of a Solar Flux Induced Chemical Process

The capability to perform in-situ, on-line monitoring of processes induced by concentrated solar flux will enhance the development and utilization of solar technologies. Temperature measurements and chemical concentration measurements provide an understanding of the ongoing chemistry, process limits, and process reproductibility. A Fourier transform infrared (FT-IR) spectrometer was opticallycoupled to a quartz flow reactor at the High Flux Solar Furnace of the National Renewable Energy Laboratory in Golden, CO. In-situ emission/transmission spectroscopy was utilized to simultaneously monitor sstream temperature and the concentration of formed hydrogen bromide during the solar flux induced reaction of steam and bromine. The photochemical process is being investigated for theproduction of industrial quantities of hydrogen and oxygen, where downstream electrolysis of the formed hydrogen bromide provides the hydrogen and regenerates bromine. Steam temperature was measured to increase upon the addition of bromine to the reactor. Gas temperature increases of 200 degrees C to 400 degrees C.were observed. Hydrogen bromide concentrations up to ten percent of the reactorgas volume were measured. The FT-IR system provided quantitive information of two critical parameters of the measured process and serves to accelerate this technology area.