Rebuttal to “Theoretical and Experimental Investigation of Solar Methane Reforming through the Nonstoichiometric Ceria Redox Cycle”

摘要: Dry reforming of methane via the nonstoichiometric ceria (CeO2 - CeO2-δ) redox cycle was theoretically and experimentally examined for converting high-temperature, solar process heat to syngas. This is composed of: (1) endothermic reduction simultaneous partial oxidation (2) exothermic reduced carbon dioxide. In both steps, chemical equilibrium calculations indicate that isothermal operation thermodynamically favorable under a wide range conditions. The influence total amount reactive gas, operating temperature, inclusion gas/solid phase exchangers on performance determined through holistic model. A solar-to-fuel conversion efficiency, defined as ratio difference between calorific value syngas (H2 CO) produced CH4 converted radiative input energy, greater than 45 % predicted with no recuperation. Experimental validation subsequently demonstrated in packed bed type reactor using high flux simulator at University Florida three discrete temperatures: 950 °C, 1035 1120 °C. Upon completion each bed-averaged oxygen nonstoichiometry equaled 0.07, 0.21, 0.24, yielding conversions 9, 41, 51 respectively. At extrapolated efficiency 9.82 %.