Calcium-containing copper-based composite oxygen carrier and preparation method thereof

An oxygen carrier, calcium copper technology, applied in the direction of copper oxide/copper hydroxide, calcium/strontium/barium oxide/hydroxide, fuel additives, etc., can solve the problem of reduced activity and cycle stability, easy sintering, The reaction rate is not fast enough to achieve the effect of oxygen release rate and oxygen release quality improvement, good dispersion, and simple preparation method

Inactive Publication Date: 2014-10-29
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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. It is proposed that CuO oxygen carrier has reduced activity and cycle stability at high temperature , prone to sintering, the reaction rate is not fast enough and other shortcomings

Method used

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  • Calcium-containing copper-based composite oxygen carrier and preparation method thereof

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preparation example Construction

[0033] A preparation method of a calcium-copper-based composite oxygen carrier, comprising the following steps:

[0034] Step 1: Add Ca(NO 3 ) 2 The solution was added dropwise to Cu(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 the calcium-containing copper-based composite oxygen carrier.

[0039] Cu(NO 3 ) 2 and Ca(NO 3 ) 2 The mass ratio of is 21.38:1, 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 2...

Embodiment 1

[0044] Take 28.62 g Cu(NO 3 ) 2 ·3H 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 2.13g Ca(NO 3 ) 2 4H 2 O 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 ...

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Abstract

The invention discloses a calcium-containing copper-based composite oxygen carrier and a preparation method thereof. The oxygen carrier comprises the following components in percentage by mass: 95% of CuO and 5% of CaO. By adopting a sol-gel method, the calcium-containing copper-based composite oxygen carrier which is uniform in particle size and good in dispersity can be prepared by controlling proper reaction conditions; the preparation method of the calcium-containing copper-based composite oxygen carrier is simple, the prepared composite oxygen carrier has higher reaction rate, and the oxygen release rate can be obviously promoted.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C10L10/00C01G3/02C01F11/02
Inventor 王文举程明张彬
Owner NANJING UNIV OF SCI & TECH
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