✍ Scribed by T Kodama; T Shimizu; T Satoh; M Nakata; K.-I Shimizu
No coin nor oath required. For personal study only.
The methane reforming process combined with metal-oxide reduction was examined on iron-based oxides of Ni(II)-, Zn(II)-, and Co(II)-ferrites, for the purpose of converting solar high-temperature heat to chemical fuels of CO-rich syngas and reduced metal oxide as storage and transport of solar energy. It was found that the Ni(II)-doping effectively improves the reactivity of magnetite as an oxidant for methane reforming. A two-step cyclic steam reforming of methane, which produces CO-rich syngas and hydrogen uncontaminated with carbon oxides alternately in the separate steps, was successfully demonstrated by using a ZrO -supported Ni(II)-ferrite (Ni Fe O / ZrO ) as a working material in the temperature range of 2 0.39 2.61 4 2
1073-1173 K. The produced CO-rich syngas had the H / CO ratio that was more suitable for methanol 2 production than that produced by a conventional single-step steam reforming. This syngas production using the Ni Fe O / ZrO as an oxidant was also demonstrated under direct irradiation by a solar-simulated, 0.39 2.61 4 2 high-flux visible light in laboratory-scale fixed bed system. The directly-irradiated Ni Fe O / ZrO 0.39 2.61 4 2 particles acted simultaneously as good radiant absorbers and reactive chemical reactants to yield more than 22 90% of methane conversion to a 2:1 molar mixture of CO and H under flux irradiation of 500 kW m in the 2 residence time less than 1 s.
📜 SIMILAR VOLUMES
03 Gaseous fuels (derived gaseous fuels) 03/