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Oxygen carrier for chemical cycle dry gas reforming, and preparation method and application of oxygen carrier

A dry gas reforming and oxygen carrier technology, which is applied in chemical instruments and methods, inorganic chemistry, bulk chemical production, etc., can solve the problems of low cycle reactivity, reduced reactivity, high reaction temperature, etc., and achieve low cost, The effect of promoting the formation and improving the catalytic activity

Active Publication Date: 2015-11-18
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Fe 2 o 3 Oxygen-like carrier and carrier Al 2 o 3 or SiO 2 Easy to form spinel or silicate structure resulting in reduced reactivity
In short, the currently developed oxygen carriers have shortcomings such as low oxygen loading rate, low cycle reactivity, and inability to withstand high reaction temperature.

Method used

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  • Oxygen carrier for chemical cycle dry gas reforming, and preparation method and application of oxygen carrier
  • Oxygen carrier for chemical cycle dry gas reforming, and preparation method and application of oxygen carrier
  • Oxygen carrier for chemical cycle dry gas reforming, and preparation method and application of oxygen carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of hexaaluminate (LaFe 3 Al 9 o 19 ) oxygen carrier. Proceed as follows:

[0044] 2.54 grams of lanthanum nitrate (La(NO 3 ) 2 ), 7.1 grams of iron nitrate (Fe(NO 3 ) 3 9H 2 O) and 19.78 grams of aluminum nitrate (Al(NO 3 ) 3 9H 2 O) were respectively dissolved in deionized water at 60° C. to form lanthanum nitrate solution, iron nitrate solution, and aluminum nitrate solution each at 1 mol / L. After mixing the lanthanum nitrate solution and the ferric nitrate solution evenly, use 0.1mol / L nitric acid to adjust the pH value to 1, then add the aluminum nitrate solution, after mixing evenly, a mixed solution is obtained, and quickly add the mixed solution to excess saturated ammonium carbonate In the solution, stir rapidly (stirring speed is 250r / min) at 60°C for 6 hours, filter to obtain precipitate, dry the precipitate at 120°C for 12 hours, then roast the precipitate, and then cool down to room temperature naturally. Wherein, the amount of ammoni...

Embodiment 2

[0049] Preparation of Ba 1-x La x FeAl 11 o 19 (x=0-1, step size is 0.2) hexaaluminate oxygen carrier, labeled B 1-x L x F (LF when x=1, BF when x=0), the Ba(NO 3 ) 2 , La(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and Al(NO 3 ) 3 9H 2 O was dissolved in deionized water at 60°C to form 1 mol / L Ba(NO 3 ) 2 solution, La(NO 3 ) 3 solution, Fe(NO 3 ) 3 solution, Al(NO 3 ) 3 solution. Ba(NO 3 ) 2 solution, La(NO 3 ) 3 solution, Fe(NO 3 ) 3 After the solution is mixed evenly, use 2mol / L nitric acid to adjust the pH value to 1, then add aluminum nitrate solution, after mixing evenly, a mixed solution is obtained, and the mixed solution is quickly added to an excess of 1mol / L saturated ammonium carbonate solution. After stirring vigorously at 60°C for 6 hours, filter the precipitate, wash the precipitate with deionized water for 3-5 times and dry at 120°C for 12 hours; grind, then transfer to a muffle furnace and bake at 500°C for 4 hours , and then baked at 12...

Embodiment 3

[0055] Preparation of LaFe x Al 12-x o 19 (x = 0-4, step size 1) hexaaluminate oxygen carrier, labeled LF x (When x=0, LFxA=LA). The molar ratio is 1:x:(12-x) La(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O and Al(NO 3 ) 3 9H 2 O was respectively dissolved in deionized water at 60°C to form a 1mol / L solution. Mix lanthanum nitrate solution and ferric nitrate solution evenly, use 1mol / L nitric acid to adjust PH=1, then add aluminum nitrate solution, after mixing evenly, quickly add to excess saturated ammonium carbonate solution, at 60°C 400r / Stir vigorously for 6 hours; filter and separate, wash with deionized water for 3-5 times, and then dry at 120°C for 12 hours; mill, transfer to a muffle furnace and bake at 500°C for 4 hours, then heat up to 1100°C for 4 hours, Let it cool down to room temperature naturally. Wherein, the amount of ammonium carbonate in the saturated ammonium carbonate solution is 1.6 times of the required molar amount of ammonium carbonate when lan...

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Abstract

The invention provides an oxygen carrier for chemical looping dry gas reforming, and a preparation method and application of the oxygen carrier. The oxygen carrier is a composite metal oxide adopting a hexaaluminate structure, and has the general formula of AMxAl(12-x)O19, wherein A is rare earth metal lanthanum and / or barium, M is transition metal Fe, and x is greater than 0 or smaller than 5. The temperature of the oxygen carrier in a fuel reactor is 750-1000 DEG C, and the temperature of the oxygen carrier in an oxidation reactor is 750-1000 DEG C, and both of the reaction pressures are normal pressure. The preparation method comprises the following steps: using iron nitrate, aluminum nitrate, lanthanum nitrate and / or barium nitrate as a precursor to prepare a nitrate solution; adding ammonium carbonate as a precipitant for coprecipitation; performing suction filtration, washing, drying and roasting to obtain the oxygen carrier. The oxygen carrier has the advantages of being larger in oxygen-carrying rate, higher in reactivity, excellent in shock-resistant mechanical property and high temperature stability, environmental-friendly, low in cost and easy to prepare.

Description

technical field [0001] The invention belongs to the technical field of catalysts in the field of chemical cycle dry gas reforming, and in particular relates to an oxygen carrier for chemical cycle dry gas reforming and its preparation method and application. Background technique [0002] At present and for a long time to come, the world's energy consumption structure will still be dominated by fossil energy such as coal, oil, and natural gas. Coal, oil, and natural gas as carbon-containing energy sources (C n h m O), whose utilization ends in CO 2 generation, while CO 2 As a major greenhouse gas, it has had a serious impact on global warming and environmental degradation. During the traditional direct combustion of fossil fuels, due to the N in the air 2 dilution, the CO in the flue gas produced 2 Only 10% to 14%, CO 2 The separation cost is higher. Combining new energy conversion principles with CO 2 The organic combination of enrichment process is undoubtedly a ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J23/83C01B3/40
CPCY02P20/52
Inventor 朱燕燕马晓迅刘伟伟刘莹刘泽民
Owner NORTHWEST UNIV(CN)
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