Carbon Dioxide Reforming of Methane in Directly Irradiated Solar Reactor With Porcupine Absorber

A new solar volumetric reactor for $CO2$ reforming of $CH4$ was tested at the Solar Tower of the Weizmann Institute of Science. The reactor design was based on extensive previous experimental work with a volumetric receiver for heating air and simulation of volumetric reformer. The main parts of the reactor were a conical quartz window and a Porcupine absorber as the surface where chemical and thermal energy conversion took place. A specially developed ruthenium catalyst was used. The $CO2$ to $CH4$ ratio was about 1:1.2, and the total inlet flow rate was between 100 slpm and 235 slpm (slpm denotes standard liter per minute). The maximum absorber temperature was kept below 1450 K. The conversion of $CH4$ reached 85%. The total power absorbed was between 10.3 kW and 18.2 kW, of which the thermal power part was 2.3–4.5 kW and the stored chemical enrichment was 7.5–13.7 kW. The results indicate that this type of volumetric reactor can be used effectively for $CO2$ reforming of $CH4$⁠, and further work aimed at improving the total efficiency of the system is in progress.