A kind of highly selective oxygen carrier and its preparation method and application
A high-selectivity, oxygen-carrying technology, applied in chemical instruments and methods, vanadium oxide, inorganic chemistry, etc., can solve the problems of reducing the effective concentration of syngas, complex preparation, and high raw material cost, and achieve improved energy utilization efficiency, preparation The method is simple and the cost of raw materials is low
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[0021] A preparation method of highly selective oxygen carrier, said preparation method comprising:
[0022] Selecting an appropriate amount of vanadium-containing material as a raw material, drying the raw material at 80-100° C. to obtain a dry material, so that the quality change of the dry material does not exceed 5 mg;
[0023] Calcining the dry material at 400-600°C for 2-5 hours to obtain the precursor of the vanadium-based highly selective oxygen carrier;
[0024] The precursor is placed in a reduction reactor, and the precursor is reduced in a hydrogen atmosphere at 500-650°C for 2-4 hours to obtain a reduced product; hydrogen gas is introduced into the reduction reactor to maintain the hydrogen atmosphere, and the In the temperature program mode, the temperature of the reduction reactor is raised to 750-1100 ° C, and then methane gas is introduced into the reduction reactor to carry out deep reduction of the reduced product for 1-3 hours to obtain a deep reduced produ...
Embodiment 1
[0029] Weigh 15g of ammonium metavanadate, first fully dry it in an oven at 100°C, then place it in a tube furnace, raise the temperature to 550°C at a rate of 5°C / min, and roast at 550°C for 3 hours to obtain body precursors. Switch the hydrogen atmosphere and raise the temperature to 650°C at 5°C / min, and then reduce the temperature at constant temperature for 2 hours; then raise the temperature to 950°C at 5°C / min, pass in methane gas for deep reduction for 2 hours, and then switch CO at this temperature 2The atmosphere is maintained for 2 hours, and an effective oxygen carrier can be obtained.
Embodiment 2
[0031] Weigh 10g of vanadium pentoxide, fully dry it in an oven at 100°C, then place it in a tube furnace, raise the temperature to 550°C at a rate of 5°C / min, and bake at 550°C for 2 hours. Then switch the hydrogen atmosphere and raise the temperature to 620°C at 5°C / min, and then reduce the temperature at a constant temperature for 2 hours; then raise the temperature to 1000°C at 5°C / min, pass in methane gas for deep reduction for 2 hours, and then switch CO at this temperature 2 The atmosphere is maintained for 2 hours, and an effective oxygen carrier can be obtained.
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