(329b) Solar Thermochemical CO2 Splitting Using CexZn1-XO2 Derived Via Co-Precipitation Method
Thermochemical splitting of H2O and CO2 generates a mixture of CO and H2 i.e. syngas which can be used for the production of storable and transportable liquid hydrocarbon fuels via Fischer-Tropsch (FT) process. This offers a renewable, environment friendly and long-term solution for future energy demand with CO2 mitigation. The MO-based two-step solar thermochemical fuel production process involves successive reduction and re-oxidation of the metal oxides resulting into production of O2 and H2/syngas in separate steps. Among the various metal oxides investigated until now, ceria based redox materials are considered as a very good option due to their high thermal stability and faster kinetics. Recently we have explored transition metal doped ceria materials (Ce0.9M0.1O2, where, M = transition metal dopants) towards thermochemical splitting of CO2. The obtained results indicate that the doping of Zn in the ceria fluorite crystal structure is very beneficial towards achieving higher levels of O2 release and CO production. In this study, we have synthesized CexZn1-xO2 (by varying x in the range of 0 to 0.5) using co-precipitation of hydroxide method. The physical properties of the CexZn1-xO2 materials are analyzed using powder X-ray diffraction, BET surface area analyzer, scanning and transmission electron microscope, and energy dispersive spectroscope. The synthesized CexZn1-xO2 materials are further examined in multiple thermochemical CO2 splitting cycles using a high temperature TGA. The gases evolved are analyzed using an online GC-MS set-up. Based on the variations in the mass loss/gain profiles and the GC-MS results, the amounts of O2 released and CO produced by all CexZn1-xO2 materials investigated in this study are calculated. The detailed analysis of the synthesis, characterization, and CO2 splitting reactions will be discussed in detail.
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