Investigations of Mixed Iron Oxides Coated on Ceramic Honeycomb Structures for Thermochemical Hydrogen Production

摘要

The present work investigates a two-step thermochemical cycle for sustainable hydrogen production using silicon carbide honeycombs coated with a zinc ferrite redox system. Detailed investigations are performed with coated honeycombs in a laboratory test set-up. Material changes are identified with different material analysis techniques. Based on these results, reasons for the deactivation of the material are identified. The influence of the main operating parameters, regeneration temperature and regeneration time, water-splitting temperature and molar ratio of water, on the hydrogen production rate is investigated in parametric studies with coated honeycombs. An overall model for simulation of hydrogen production rates as a function of the investigated operating parameters and incorporating the deactivation of the material is developed. An optimized operational strategy of solar receiver-reactors and future material developments are proposed.