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Method for applying mesocellular silica hollow sphere iron-based oxygen carrier

A technology of mesoporous silica and application method, which is applied in the petroleum industry, fuel additives, fuels, etc., can solve the problems of low loading of metal oxides, easy sintering and agglomeration, and low mechanical strength, so as to avoid agglomeration and sintering , Improving the response ability, the effect of stabilizing physical and mechanical properties

Inactive Publication Date: 2012-07-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional composite oxygen carrier is to support the metal oxide on the surface of the inert carrier, and there are problems such as low metal oxide loading, low mechanical strength, and easy sintering and agglomeration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of mesoporous silica hollow spheres: Measure 10 mL of 25% tetrapropylammonium hydroxide (TPAOH) aqueous solution and 0.92 g of NaOH dissolved in 45 mL of deionized water, and measure 0.33 g of Al 2 (SO 4 ) 3 18H 2 O was dissolved in water to form a 47mL solution, then 11.2mL of tetraethyl orthosilicate (TEOS) was added and stirred rapidly for 20min, the above two solutions were mixed and stirred for 4h and then left to stand at 5°C for 24h; measure 2.72g of Cetyltrimethylammonium bromide (CTAB) was dissolved in water to make a 100mL solution, and this solution was added to the previous mixed solution, stirred vigorously at room temperature for 8 hours, and then the white solution was transferred to the lined polytetrafluoroethylene In a stainless steel reaction kettle made of vinyl fluoride, heat water in a constant temperature oven at 140°C for 24 hours; after cooling, filter and wash with deionized water several times, dry the white solid in an ordi...

Embodiment 2

[0031] (1) Preparation of mesoporous silica hollow spheres: According to the method of step (1) in Example 1, 3 g of mesoporous silica hollow spheres were prepared.

[0032] (2) Fe 2 o3 Filling of the inner core: measure 80g of Fe(NO 3 ) 3 9H 2 O was dissolved in ethanol to form a solution with a concentration of 1 mol / L, and 3 g of mesoporous silica hollow spheres obtained above were added to the above solution, and the suspension was evacuated for 30 min under ultrasonic conditions, then the vacuum pump was turned off and the The pressure in the container was adjusted to normal pressure, and the ultrasonic treatment was continued for 10 minutes; after the mixture was centrifuged, the solid was blown and dried at room temperature, and the dry powder was quickly washed twice with absolute ethanol, and then blown and dried again at room temperature, Finally, the dry powder was calcined at 500°C for 3h (programmed temperature increase rate was 4°C / min, holding time was 3h), a...

Embodiment 3

[0035] (1) Preparation of mesoporous silica hollow spheres: Measure 10mL of TPAOH (25% aqueous solution) and 0.80g of NaOH dissolved in 45mL of deionized water, and measure 0.30g of Al 2 (SO 4 ) 3 18H 2 O was dissolved in water to form a 47mL solution, then 11.2mL of TEOS was added and stirred rapidly for 20min, the above two solutions were mixed and stirred for 4h and then left to stand at 5°C for 24h; 2.50g of CTAB was dissolved in water to form 100mL Add the solution to the previous mixed solution, stir vigorously at room temperature for 8 hours, then transfer the white solution to a stainless steel reaction kettle lined with polytetrafluoroethylene, and heat it in a constant temperature oven at 140°C for 24 hours; After cooling, filter and wash with deionized water for several times, put the white solid in an ordinary forced air drying oven to dry at 110°C for 4h, and finally roast at 500°C for 6h (the temperature program rate is 1.5°C / min, and the holding time is 6h), ...

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Abstract

The invention belongs to the technical field of chemical-looping combustion, which particularly relates to a method for applying a mesocellular silica hollow sphere iron-based oxygen carrier in the chemical-looping combustion of combustible gas. The method uses a mesocellular silica hollow sphere serving as a carrier and Fe2O3 serving as an active kernel to prepare an iron-based oxygen carrier based on the mesocellular silica hollow sphere. In the oxygen carrier, the mass percent of the Fe2O3 is 60-90%. By utilizing the oxygen carrier, the chemical-looping combustion of single components including H2, CO, CH4 and the like or combustible gas can be achieved. The mesocellular silica hollow sphere serving as the carrier not only has a large cavity structure, but also can store much Fe2O3, and further is provided with a through mesocellular channel so that matter diffusion is not affected. In addition, an inert carrier SiO2 does not react with the Fe2O3, thereby avoiding loss of the Fe2O3. Furthermore, the Fe2O3 kernel is separated through a mesocellular casing, thereby avoiding sintering of the Fe2O3. The oxygen carrier has good reaction activity and stability and long service life in the chemical-looping combustion process of the combustible gas.

Description

technical field [0001] The invention belongs to the technical field of chemical looping combustion, and in particular relates to an application method of mesoporous silica hollow nodular iron-based oxygen carrier in chemical looping combustion of combustible gas. technical background [0002] Chemical looping combustion is an efficient, clean and economical new flameless combustion technology. Its core idea is to transfer the oxygen in the air to the fuel in the form of lattice oxygen through an oxygen carrier, so as to realize the combustion reaction of the fuel in an air-free atmosphere. It has enriched CO 2 and low NO x The characteristics of pollutant emissions have attracted people's attention. The key to this technology is to select or develop oxygen carriers with good physical and chemical properties. In the process of chemical looping combustion, the evaluation indicators of oxygen carrier mainly include: reactivity with fuel and air, thermal stability, oxygen ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L10/00
Inventor 董长青陆强杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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