| 摘要： |
Conversion of CO, and H2O into synthesis gas via the solar thermochemical process is usually carried out at a high temperature of above 1500 degrees C and requires long-term durability of metal oxide catalysts during frequent heating cooling cycles. Herein, a dual-phase Ce0.9Pr0.1O2-delta-Pr0.6Sr0.4FeO3-delta oxygen transport membrane made of mixed metal oxides was employed for the one-step thermochemical conversion of CO, and H2O to synthesis gas with a F12/ CO ratio of 2:1. Benefitting from the in situ removal of the generated oxygen through the highly oxygen-ion permeable membrane, the effective splitting of CO2 and H2O was achieved at the relatively low temperature of <1000 degrees C. A synthesis gas production rate of 1.3 mL min-lcm-2 was obtained at 930 C for a H2O/CO2 feed ratio of 5:1 with a H2O conversion of above 1.7% and a CO2 conversion of above 4.2%. Compared with the discontinuous two-step thermochemical decomposition, the combination of solar energy, catalytic thermolysis, and oxygen transport membrane reactor as proposed in this work offers a new perspective and an alternative route to convert H2O and CO, into synthesis gas. |
