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Manganese-containing cobalt-based complex oxygen carrier and preparation method thereof

An oxygen carrier, manganese cobalt technology, applied in the field of composite oxide oxygen carrier and its preparation, can solve the problems of easy sintering, insufficient reaction rate, reduced activity and cycle stability of the oxygen carrier, etc. Good, the oxygen release rate and oxygen release quality are improved, and the preparation method is simple.

Inactive Publication Date: 2014-11-05
NANJING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

Metal oxide oxygen carriers have received extensive attention due to their high reactivity and high temperature resistance, but there are still disadvantages such as insufficient reaction rate.
[0006] Wang Jie, Wang Wenju, etc. Research progress of oxygen carrier in chemical looping combustion technology [J]. Modern Chemical Industry, 2012, 32(11): 13-17. Co 3 o 4 The activity and cycle stability of the oxygen carrier decrease at high temperature, and it is prone to sintering, and the reaction rate is not fast enough, etc.

Method used

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  • Manganese-containing cobalt-based complex oxygen carrier and preparation method thereof

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preparation example Construction

[0033] A preparation method of manganese-cobalt-based composite oxygen carrier, comprising the following steps:

[0034] Step 1: Mn(NO 3 ) 2 The solution was added dropwise to Co(NO 3 ) 2 solution, stir until uniformly mixed;

[0035] Step 2: Add citric acid solution, and stir while evaporating at 70-80°C until the mixture forms a wet gel;

[0036] Step 3: The wet gel turns into a dry gel after drying;

[0037] Step 4: Calcining the xerogel at 500°C until the organic matter is fully burned and the nitrate is completely decomposed, then the temperature is raised to 800°C to activate the oxygen carrier;

[0038] Step 5: Grinding and sieving the oxygen carrier particles obtained in step 4 to obtain a manganese-cobalt-based composite oxygen carrier.

[0039] Co(NO 3 ) 2 and Mn(NO 3 ) 2 The mass ratio of is 31.38:1, and the molar ratio of citric acid described in step 2 and Cu atom is 2:1.

[0040] The drying condition in step 3 is to dry at 105° C. for 24 hours.

[004...

Embodiment 1

[0044] Take 38.62 g Co(NO 3 ) 2 ·6H 2 O was put into a 500 ml beaker, and 100 ml of distilled water was added, and then the beaker was placed on a magnetic stirrer with a constant temperature water bath, and the stirring speed was 400 rpm. Take 3.13g Mn(NO 3 ) 2 4H 2O into a 100 ml beaker, add 50 ml of distilled water, stir until completely dissolved. Then add the calcium nitrate solution dropwise to the copper nitrate solution, and stir while adding dropwise. Take 49.87 g of citric acid, put it into a beaker with 100 ml of distilled water and stir until it is completely dissolved. After the above solution is stirred evenly, slowly add the citric acid solution, and stir while adding it dropwise. After stirring for 6 hours, the solution had dehydrated into a viscous wet gel. The wet gel was placed in a forced air drying oven at 105 °C, and after drying for 24 hours, the wet gel in the beaker became a dry gel. Take out the dry gel, place it in a muffle furnace at 500°C f...

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Abstract

The invention discloses a manganese-containing cobalt-based complex oxygen carrier and a preparation method thereof. The oxygen carrier is composed of Co3O4 and MnO2, wherein the mass percentage of the Co3O4 is 95%, and the mass percentage of the MnO2 is 5%. According to the invention, by adopting a sol-gel method and controlling appropriate reaction conditions, a manganese-containing cobalt-based complex oxygen carrier with a uniform particle size and good dispersion is prepared; and the preparation method of the manganese-containing cobalt-based complex oxygen carrier disclosed by the invention is simple, a prepared complex oxygen carrier has a fast reaction rate, and the oxygen release rate is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of oxygen carrier particles in a chemical chain oxygen decoupling system. It specifically relates to a composite oxide oxygen carrier and its preparation method and application. Background technique [0002] The problem of global warming caused by greenhouse gas emissions is attracting people's attention. CO 2 As the most important greenhouse gas, the study of CO 2 Emission reduction technologies are imminent. CO in flue gas 2 Often diluted with large amounts of nitrogen, CO 2 The cost of separation and recovery is very high. High concentrations of CO are produced during combustion 2 or facilitate CO 2 It is an effective way to separate the gas phase mixture and eliminate the formation and emission of other pollutants. Chemical-Looping Combustion (CLC for short) is a new type of combustion with the above characteristics, which has received more attention. [0003] The basic principle...

Claims

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Application Information

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IPC IPC(8): C10L10/00B01J23/889
Inventor 王文举程明张彬
Owner NANJING UNIV OF SCI & TECH
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