The use of solar energy to produce solar fuels, such as CO and H2, by the reforming reaction between CH4 and CO2 is a promising technology to alleviate the global warming effect caused by CO2. The carbon dioxide reforming of methane (CRM) reaction is an endothermic reaction, and can only be carried out at a high temperature. The photo-thermochemical CRM method is studied, in which solar energy is directly concentrated on Ni/CeO2 catalyst to reduce the CRM reaction temperature. XRD and SEM are used to characterize the composition and morphology of Ni/CeO2 catalyst. And the synergetic effects of light and heat in photo-thermochemical reactions are investigated. The results show that photo-thermochemical reactions have higher CH4 conversion and production rate of H2 than thermochemical reactions at the same temperature. It is found that photo-generated carriers play an important role in improving CRM performance. These findings provide a promising way to consume CO2 and achieve the goal of carbon neutrality.
Keywords photo-thermochemical reaction, CO2 reforming of CH4, CO2 consumption, solar fuels