A kind of manganese-based molecular sieve deoxidizer and its preparation method and application
A sieve deoxidizer and molecular sieve technology, applied in the field of deoxidizers, can solve the problems of insufficient removal depth, incomplete utilization of active components, and low oxygen adsorption capacity
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[0025]The invention provides a method for preparing a manganese-based molecular sieve deoxidizer, which comprises the following steps:
[0026]Mix Y-type molecular sieve with water to obtain Y-type molecular sieve solution;
[0027]Subjecting the Y-type molecular sieve solution and the water-soluble manganese salt to a spontaneous co-precipitation reaction to obtain a first precursor;
[0028]Subjecting the first precursor to gradient vacuum roasting to obtain a second precursor;
[0029]In a hydrogen-containing atmosphere, the second precursor is subjected to a reduction reaction to obtain a manganese-based molecular sieve deoxidizer; the temperature of the reduction reaction is 150-300°C.
[0030]In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.
[0031]In the present invention, Y-type molecular sieve and water are mixed to obtain Y-type molecular sieve solution.
[0032]In the present invention...
Embodiment 1
[0056]Under the conditions of 60℃ water bath heating and 200rpm, 10g NaY molecular sieve and 40mL deionized water were stirred uniformly, 5g manganese nitrate was slowly added within 50min, and then heated in a 60℃ water bath, stirred at 300rpm for 30min, and the resulting reaction system proceeded Suction filtration, drying the obtained solid product at 80°C to obtain the first precursor;
[0057]The first precursor was placed in a vacuum muffle furnace, heated to 500°C at a temperature increase rate of 10°C / min, and kept for 4h, where the vacuum degree was -95kPa, and the calcined product obtained was subjected to tableting and grinding treatments To the particle size of 0.5~1.0mm, the second precursor is obtained;
[0058]In a hydrogen-containing atmosphere (hydrogen volume fraction is 50%), the space velocity is 500h-1At 250°C, the second precursor is reduced for 5 hours to obtain a manganese-based molecular sieve deoxidizer (marked as S1), in which the MnO content is 14.5%; the tempe...
Embodiment 2
[0061]Under the conditions of 80℃ water bath heating and 100rpm, 15g NH4Y-type molecular sieve and 300mL deionized water are stirred uniformly, 15g manganese chloride is slowly added within 45min, and then stirred for 50min, the resulting reaction system is suction filtered, and the resulting solid product is dried at 90°C to obtain the first precursor ;
[0062]Put the first precursor in a vacuum muffle furnace, heat it up to 400°C at a heating rate of 5°C / min, and then keep it for 6 hours, where the vacuum degree is -96kPa, and the resulting calcined product is subjected to tableting and grinding treatments To the particle size of 0.5~1.0mm, the second precursor is obtained;
[0063]In hydrogen atmosphere (hydrogen volume fraction is 100%), space velocity is 1000h-1At 150°C, the second precursor is reduced for 10 hours to obtain a manganese-based molecular sieve deoxidizer (marked as S2), in which the MnO content is 19.6%; the temperature rise during the reduction is 1.6°C.
[0064]Use the...
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