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Application method of nickel (Ni)-loaded mesoporous silicon dioxide hollow sphere iron-based oxygen carrier

A technology of mesoporous silica and application methods, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, solid fuels, etc., can solve the problems of easy sintering and agglomeration, low mechanical strength, and metal oxidation Low material load and other problems, to improve the reaction ability, stable physical and mechanical properties, avoid agglomeration and sintering

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

[0034] (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 ordin...

Embodiment 2

[0039] (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.

[0040] (2) Fe 2 o 3 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),...

Embodiment 3

[0044] (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 field of chemical looping combustion and particularly designs an application method of a nickel (Ni)-loaded mesoporous silicon dioxide hollow sphere iron-based oxygen carrier. According to the invention, a mesoporous silicon dioxide hollow sphere is taken as a carrier, NiO servers as an active catalytic ingredient and is loaded on the outside surface of the hollow sphere and the surfaces of mesoporous passages, Fe2O3 serves as an active oxygen-carrying ingredient and is filled into the inside cavity of the hollow sphere, and then, an iron-based oxygen carrier based on the Ni-loaded mesoporous silicon dioxide hollow sphere is obtained; in the Ni-loaded mesoporous silicon dioxide hollow sphere iron-based oxygen carrier, the mass percent of the NiO and the mass percent of the Fe2O3 are respectively 0.1-2% and 58-90%; and the direct chemical looping combustion of solid fuels, such as coal, biomass and the like, can be achieved by using the Ni-loaded mesoporous silicon dioxide hollow sphere iron-based oxygen carrier. The Ni-loaded mesoporous silicon dioxide hollow sphere iron-based oxygen carrier has the advantages of excellent reaction activity and stability and long service life during the process of the direct chemical looping combustion of the solid fuels, such as the coal, the biomass and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical looping combustion, and in particular relates to an application method of a nickel-loaded mesoporous silica hollow nodular iron-based oxygen carrier. technical background [0002] Chemical loop combustion is an efficient, clean and economical new flameless combustion technology. It transfers the oxygen in the air to the fuel in the form of lattice oxygen through the 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. At present, the main oxygen carriers studied are Fe, Ni, Co, Cu, Mn and other metal oxides, among which Fe 2 o 3 Due to the advantages of low price, good physical properties and no pollution, it has received exten...

Claims

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Application Information

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IPC IPC(8): C10L9/12B01J23/755
Inventor 董长青陆强杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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