Method for carrying out solar thermal decomposition on H2O and/or CO2 employing perovskite dispersed by different carriers

Abstract

The invention relates to a method for decomposing H2O and/or CO2 through a two-step thermochemical cycle to produce H2 and/or CO by taking a perovskite compound which is dispersed by SiO2 with different pore structures as an active material. The dispersion mode comprises the forms such as direct mechanical mixing, in-situ packaging and packaging in a mesoporous duct; SiO2 comprises SBA-15, MCM-41, MCF and other mesoporous structures; and the method comprises the following main steps: (1) firstly discharging oxygen from loaded active material at a high temperature (1100-1300 DEG C); and (2) enabling the active material containing a lot of oxygen vacancies to react with H2O and/or CO2 at a relatively low temperature (800-1100 DEG C), discharging H2 and/or CO. According to the method and the material provided by the invention, high-temperature heat generated by solar concentration can be utilized as an energy source; H2O and CO2 are taken as reaction materials; compared with the reported results, H2 and CO can be stably and quickly produced at a relatively low reduction temperature; and the method is clean and free of pollution, and is expected to become an effective technology for preparing chemical fuels by reducing CO2 through solar energy.

Description

technical field [0001] The invention relates to the conversion and utilization of solar energy-thermal energy, and the thermal energy is used to decompose H in a two-step thermochemical cycle 2 O and / or CO 2 , to prepare H 2 and / or CO, more specifically related to porous SiO 2 As the carrier, the perovskite compound is used as the active material, and the perovskite compound is dispersed in the porous SiO 2 On the carrier, the reactivity was significantly improved. Background technique [0002] Due to the unsustainability of fossil energy, as well as the greenhouse effect and environmental pollution caused by its use, it is urgent to study a clean and environmentally friendly renewable energy system. my country is currently CO 2 The second largest emitter, CO 2 Emissions show a trend of rapid growth and are under increasing pressure from the international community. Solar energy has the advantages of inexhaustible, clean and pollution-free, renewable, etc., using sola...

AI Technical Summary

Problems solved by technology

[0010] It is not difficult to find from the reported work that the two-step thermochemical cycle decomposition of H 2 O / CO 2 The work is still in the basic research stage. The improvement of the reactivity mainly focuses on the doping and loading of the active material, but there are few studies on the modification of the carrier itself and the loading method.

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