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Ni-based catalyst adopting core-shell structure and used in DRM (dry reforming of methane) and preparation method

A nickel-based catalyst and core-shell structure technology, applied in the field of chemical industry, can solve the problems of difficult migration and aggregation, achieve the effects of inhibiting aggregation, enhancing anti-sintering and anti-carbon deposition capabilities, and good structural stability

Inactive Publication Date: 2018-01-09
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the synthesized Ni@SiO 2 The catalyst still has the phenomenon of nickel particle aggregation during the reaction process. According to literature reports, Ni and metal oxides with redox or acid-base properties such as ZrO 2、 La 2 o 3 , CeO 2 etc. have strong interactions, and are not easy to migrate and aggregate in high temperature reactions

Method used

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  • Ni-based catalyst adopting core-shell structure and used in DRM (dry reforming of methane) and preparation method
  • Ni-based catalyst adopting core-shell structure and used in DRM (dry reforming of methane) and preparation method
  • Ni-based catalyst adopting core-shell structure and used in DRM (dry reforming of methane) and preparation method

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Experimental program
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Embodiment 1

[0029] Weigh the precursor salts of nickel nitrate hexahydrate and zirconium nitrate pentahydrate, dissolve them in distilled water, and prepare mixed aqueous solutions with the concentrations of nickel nitrate and zirconium nitrate at 0.40 mol / L and 0.11 mol / L, respectively. Weigh 40.32g of polyethylene glycol mono-4-nonphenyl ether (n≈5) and dissolve it in cyclohexane, add 4.32ml of the above-mentioned mixed aqueous solution of nickel nitrate and zirconium nitrate to the solution, and stir at 30°C 15h. Then add 4.32ml of concentrated ammonia water with a mass fraction of 28%, continue to stir at 30°C for 2h, then add 5ml of tetraethyl orthosilicate to it, and continue to stir at 30°C for 2 days. Add 40ml of ethanol to the resulting solution, then centrifuge at 10,000rp / min for 15min to collect, and wash three times with a mixed solvent of acetone and cyclohexane with a volume ratio of 1:1. Vacuum-dried at 40°C for 12h, ground properly, and fired at 800°C for 4h at a heating...

Embodiment 2

[0032] The precursor salts of nickel nitrate hexahydrate and zirconium nitrate pentahydrate were weighed, dissolved in distilled water, and mixed aqueous solutions with concentrations of nickel nitrate and zirconium nitrate of 0.59 mol / L and 0.20 mol / L were prepared. Weigh 40.32g of polyethylene glycol mono-4-nonphenyl ether (n≈5) and dissolve it in cyclohexane, add 4.32ml of the above-mentioned nickel nitrate aqueous solution to the solution, and stir at 30°C for 15h. Then add 4.32ml of concentrated ammonia water with a mass fraction of 28%, continue to stir at 30°C for 2h, then add 5ml of tetraethyl orthosilicate to it, and continue to stir at 30°C for 2 days. Add 40ml of ethanol to the resulting solution, then centrifuge at 10,000rp / min for 15min to collect, and wash three times with a mixed solvent of acetone and cyclohexane with a volume ratio of 1:1. Vacuum-dried at 40°C for 12h, ground properly, and fired at 800°C for 4h at a heating rate of 2°C / min in an air atmosphere...

Embodiment 3

[0034] The precursor salts of nickel nitrate hexahydrate and zirconium nitrate pentahydrate were weighed, dissolved in distilled water, and mixed aqueous solutions with concentrations of nickel nitrate and zirconium nitrate of 0.28 mol / L and 0.04 mol / L were prepared. Weigh 40.32g of polyethylene glycol mono-4-nonphenyl ether (n≈5) and dissolve it in cyclohexane, add 4.32ml of the above-mentioned mixed aqueous solution of nickel nitrate and zirconium nitrate to the solution, and stir at 30°C 15h. Then add 4.32ml of concentrated ammonia water with a mass fraction of 28%, continue to stir at 30°C for 2h, then add 5ml of tetraethyl orthosilicate to it, and continue to stir at 30°C for 2 days. Add 40ml of ethanol to the resulting solution, then centrifuge at 10,000rp / min for 15min to collect, and wash three times with a mixed solvent of acetone and cyclohexane with a volume ratio of 1:1. Vacuum-dried at 40°C for 12h, ground properly, and fired at 800°C for 4h at a heating rate of ...

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Abstract

The invention discloses a Ni-based catalyst adopting a core-shell structure and used in DRM (dry reforming of methane) and a preparation method. A Ni-MOx@SiO2 (M is Zr, La and Ce) multi-core core-shell material is prepared with a reversed-phase microemulsion method with nickel nitrate, zirconium nitrate and the like as precursor salt. The additive amount of metal oxide in the catalyst is 1%-5% ofthe weight of the catalyst and the additive amount of nickel is 5%-10% of the weight of the catalyst. The sintering resistance and carbon deposit resistance of the catalyst are remarkably enhanced dueto addition of the metal oxide. The catalyst shows high activity, high stability and extremely high carbon deposit resistance and sintering resistance under the reaction conditions of normal pressure, reaction gas composition CH4:CO2 being 1.05:1, the air speed being 1,8000 ml.gcat<-1>.h<-1> and the reaction temperature being 800 DEG C. The catalyst has the advantages of being simple to prepare,free of secondary pollution to the environment, low in cost, high in catalytic efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical industry. It relates to a methane dry gas reforming catalyst and a preparation method thereof. Background technique [0002] CO 2 It is the most important greenhouse gas. With the rapid development of the global economy, the consumption of fossil fuels is accelerating, and the CO emitted by humans 2 Gas is gradually increasing, leading to energy crisis and environmental problems are becoming more and more serious, resource utilization of CO 2 Converting this abundant carbon source into high value-added chemicals can alleviate the energy crisis and the greenhouse effect at the same time, and has gradually become a hot topic in global research. Currently, the industrial use of CO 2 The main way of carbon capture and storage is carbon capture and storage, but this method not only consumes storage space, but also has low carbon dioxide utilization rate, and the cost of large-scale application and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/83C01B3/40
CPCY02P20/52
Inventor 彭洪根李乐刘文明王翔
Owner NANCHANG UNIV
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