Supported perovskite compound as well as preparation and application thereof
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A technology of perovskites and compounds, applied in carbon monoxide, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as poor cycle performance, less oxygen vacancies, and high reduction temperature of metal oxides
Inactive Publication Date: 2013-10-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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[0011] 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 primary basic research stage. The main problems of the existing active materials are: (1) high reduction temperature of metal oxides; (2) less oxygen vacancies that can be recycled; (3) cycle poor performance
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Embodiment 1
[0047] a: Weigh 4.33g of lanthanum nitrate (10mmol), 4.04g of ferric nitrate (10mmol), and 7.6856g of citric acid and dissolve them in 100ml of deionized water, stir at room temperature for 30min, stir in an 80-degree water bath until evaporated, and place in Dried in an oven at 120°C until foaming, milled, and calcined at 700°C for 4 hours, the prepared LaFeO 3 sample.
[0048] b: Mechanical mixed load. Weigh the inert high temperature resistant oxide carrier SiO according to the mass ratio of 3:1 2 , the perovskite material LaFeO 3 , ball milled for 8h, mixed evenly and baked at 900°C for 10h.
Embodiment 2
[0050] a: Weigh 4.33g of lanthanum nitrate (10mmol), 2.5101g of manganese nitrate (10mmol), and 7.6856g of citric acid and dissolve them in 100ml of deionized water, stir at room temperature for 30min, stir in an 80-degree water bath until evaporated, and place in Dried in an oven at 120°C until foaming, milled, and calcined at 700°C for 4h, the prepared LaMnO 3 sample.
[0051] b: Mechanical mixed load. Weigh the inert high temperature resistant oxide carrier SiO according to the mass ratio of 3:1 2 , the perovskite material LaMnO 3 , ball milled for 8h, mixed evenly and baked at 900°C for 10h.
Embodiment 3
[0053] a: Weigh 4.33g of lanthanum nitrate (10mmol), 2.9105g of cobalt nitrate (10mmol), and 7.6856g of citric acid and dissolve them in 100ml of deionized water, stir at room temperature for 30min, stir in a water bath at 80°C until evaporated, and place in LaCoO was dried in an oven at 120°C until foaming, milled, and fired at 700°C for 4 hours. 3 sample.
[0054] b: Mechanical mixed load. Weigh the inert high temperature resistant oxide carrier SiO according to the mass ratio of 3:1 2 , the perovskite material LaCoO 3 , ball milled for 8h, mixed evenly and baked at 900°C for 10h.
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Abstract
The invention relates to a method for generating CO by using an indifferent oxide carrier (SiO2, Al2O3, ZrO2, YSZ and the like) supported perovskite (ABO3-delta; delta is in the range from 0 to 1) compound as an active material through two-step thermochemistry cycle decomposition of CO2. The method comprises the following main steps that (1) firstly the active material gives off oxygen at a high temperature; (2) the active material containing lots of oxygen vacancies reacts with CO2 at a relatively low temperature to give off CO. According to the method, the perovskite is used as the active material for carrying out the decomposition reaction of the CO2 for the first time; compared with other active materials, the perovskite active material can give off lots of oxygen at a relatively low temperature (at 1300 DEG C at the speed of 16-25ml/g) and generate substantial amount of CO (20-30ml/g). The method has the advantages that the high-temperature heat generated by solar energy focusing is used as an energy source, and the CO2 is used as a reaction raw material for generating CO, and therefore, the method is clean and pollution-free.
Description
technical field [0001] The present invention involves a two-step thermochemical cycle for the decomposition of CO 2 , more specifically related to inert refractory oxide support (SiO 2 、Al 2 o 3 , ZrO 2 , YSZ, etc.) loaded perovskite ABO 3-δ (δ=0-1) compounds as active materials to decompose CO 2 , to prepare CO, this kind of material can give a considerable amount of CO at a lower temperature, and has a very broad application prospect in energy saving and emission reduction. 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 being inexhaustible, clean and pollution-free, and rene...
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