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Oxygen carrier of chemical-looping combustion and preparation method and application thereof

A technology of chemical chain combustion and oxygen carrier, which is used in fuels, fuel additives, petroleum industry and other directions, can solve the problems of low dispersion of metal oxides, large pressure drop in the reaction bed, and low cyclic reactivity, etc. The method is simple and easy to implement, improves the utilization rate, and improves the effect of circulating oxygen

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relatively speaking, the oxygen carrier NiO / NiAl 2 o 4 (CHO P etc. Fuel, 2004, 83(9)), Fe 2 o 3 / Al 2 o 3 (MATTISSONT etc. Fuel, 2001, 80(13)) and CoO-NiO / YSZ (JIN H G etc. Energy Fuels, 1998, 12(6)) have better overall performance, but there are large pressure drop in the reaction bed and load Oxygen has small pore size, limited oxygen carrying rate, low cycle reactivity, cannot withstand high reaction temperature, and low dispersion of metal oxides in oxygen carrier.
[0005] Three-dimensional ordered macroporous oxides have been widely concerned in catalysis in recent years because of their regular pore arrangement and pore diameters ranging from hundreds of nanometers to tens of microns. The oxygen carrier prepared by the active component carrier in the technology has not been reported yet

Method used

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  • Oxygen carrier of chemical-looping combustion and preparation method and application thereof
  • Oxygen carrier of chemical-looping combustion and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 20ml of styrene, add dropwise to 110mL of deionized water and 60mL of anhydrous ethanol solution, stir while adding dropwise, after uniform, add 10mL of initiator, the concentration of sodium persulfate in the initiator is 0.068mol / L. After stirring at 70°C for 24 hours, it was placed in a drying oven to dry for 12 hours. The template was heat-treated at 110 °C for 10 minutes to enhance the mechanical strength of the template.

[0024] Take 18.31gCe (NO 3 ) 3 ·6H 2 O, added to 40 mL of absolute ethanol, then added 4.4 g of citric acid, and stirred until a transparent color was obtained. The polystyrene template was immersed in the solution, vacuumed after 5 minutes, and dried in a drying oven at 70°C for 2 hours. Then repeat the above impregnation-pumping rate-drying process 4 times, and then program the temperature to 800°C at 2°C / min in a tubular muffle furnace, and calcinate at a constant temperature for 4 hours to obtain three-dimensional ordered macroporou...

Embodiment 2

[0028] According to the preparation steps in Example 1, the concentration of iron nitrate was changed to 1 mol / L, and the mass content of iron oxide was 11.6 wt%. The chemical chain combustion reaction performance test was carried out with this catalyst, and the test conditions were the same as those in Example 1. H 2 The conversion was 99% and the CO conversion was 96%.

Embodiment 3

[0030] According to the preparation steps in Example 1, the concentration of iron nitrate was changed to 2 mol / L, and the mass content of iron oxide was 20.9 wt%. The chemical chain combustion reaction performance test was carried out with this catalyst, and the test conditions were the same as those in Example 1. H 2 The conversion was 98% and the CO conversion was 96%.

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Abstract

The invention discloses an oxygen carrier of chemical-looping combustion and preparation method and application thereof; the oxygen carrier uses CeO2 as carrier and Fe2O3 as active component; the weight percentage of the active component Fe2O3 in the oxygen carrier is 5-30%; and the aperture of the oxygen carrier is 500nm-50um. The preparation method of the oxygen carrier comprises the following processes of: preparing template by emulsion polymerization method, preparing the macroporous CeO2 and loading the active component and the like. The oxygen carrier is applied to the chemical-looping combustion, wherein the reaction temperature in the air reactor is 500-1000 DEG C, the reaction temperature of the fuel reactor is 500-1000 DEG C, and the reaction pressure is constant pressure. The oxygen carrier of the invention has three-dimension ordered macroporous structure, uniform distribution of the active component and simple preparation method; and the oxygen carrier in the chemical-looping combustion has the advantages that the lamination of the reaction bed is reduced, the activity of the reaction bed is high and the diffusion effect of the reaction bed is good and the like.

Description

technical field [0001] The invention relates to a chemical chain combustion oxygen carrier, a preparation method and application thereof, in particular to a chemical chain combustion three-dimensional ordered macroporous oxide oxygen carrier, a preparation method and application thereof, and belongs to the chemical chain combustion. Catalyst technology in the field of chain combustion. Background technique [0002] carbon dioxide (CO 2 ) is a major greenhouse gas, reducing CO emissions during combustion 2 has become a research hotspot. All thermal power technologies use air as the oxidant, and the generated flue gas contains CO 2 Only 10% to 20%, CO 2 The cost of follow-up processing is too high to implement. Generates high concentrations of CO during combustion 2 or easy CO 2 Separated gas phase mixtures such as (CO 2 +H 2 O), while eliminating the generation and emission of other pollutants (such as NOx, SOx and Hg, etc.) is an effective way, and the choice of pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L10/00
Inventor 梁皓张舒冬倪向前
Owner CHINA PETROLEUM & CHEM CORP
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