(315a) Keynote - Jet Fuel from H2O, CO2, and Solar Energy

Authors: 
Steinfeld, A., ETH Zurich
The entire production chain for renewable kerosene obtained directly from sunlight, H2O, and CO2 has been experimentally demonstrated. The key component of the production process is a high-temperature solar reactor containing a reticulated porous ceramic (RPC) structure made of ceria, which enables the splitting of H2O and CO2 via a 2-step thermochemical redox cycle. In the 1st endothermic reduction step, ceria is reduced using concentrated solar radiation as the energy source of process heat. In the 2nd exothermic oxidation step, nonstoichiometric ceria reacts with H2O and CO2 to form H2 and CO – syngas – which is finally converted into kerosene by the Fischer-Tropsch process. The RPC features dual-scale porosity for enhanced heat/mass transport and rapid redox kinetics, while 500 consecutive redox cycles further validate material stability and structure robustness. We further report on the thermochemical splitting of CO2 into separate streams of CO and O2 with 100% selectivity, 83% molar conversion, and 5.25% solar-to-fuel energy efficiency.

References:

Marxer D., Furler P., Scheffe J., Geerlings H., Falter C., Batteiger V., Sizmann A., Steinfeld A., “Demonstration of the entire production chain to renewable kerosene via solar thermochemical splitting of H2O and CO2”, Energy & Fuels 29, pp. 3241-3250, 2015.

Marxer D., Furler P.,Takacs M., Steinfeld A., “Solar thermochemical splitting of CO2 into separate streams of CO and O2 with high selectivity, stability, conversion, and efficiency”, Energy & Environmental Science, 2017.

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