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Egg-shell oxygen carrier and preparation method thereof

An eggshell type, oxygen carrier technology, applied in chemical instruments and methods, bulk chemical production, inorganic chemistry, etc., can solve problems such as high energy consumption and harsh operating conditions, achieve large specific surface area, high conversion rate, and improve dispersion. Effect

Active Publication Date: 2014-12-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the problems of relatively harsh operating conditions and high energy consumption of traditional steam reforming of methane, the object of the present invention is to provide an "eggshell-type" oxygen carrier and its preparation method, which can be used in the cascade preparation of synthesis gas and hydrogen technology. oxygen delivery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Firstly, nano-CaCO 3 SiO was prepared by sol-gel method using sodium silicate as a template and using sodium silicate as a silicon source. 2 / CaCO 3 Core-shell structure, then CaCO removal 3 Eggshell Nano Hollow SiO 2 ;

[0029] (2) 2 g of eggshell-shaped nano-hollow SiO obtained in step (1) 2 Disperse in 100mL deionized water at a solid-to-liquid ratio of 1:50, then add CTAB solution with a concentration of 0.5mol / L dissolved in absolute ethanol at a volume ratio of 2:1, heat and keep the temperature at 50°C;

[0030] (3) With Ce(NO 3 ) 2 ·6H2 O, Zr (NO 3 ) 4 ·5H 2 O is a raw material, respectively, according to the molar ratio of Ce:Zr=1:3, to prepare a solution with a salt concentration of 0.25mol / L;

[0031] (4) Stir the solution obtained in step (3) at a speed of 300 r / min at 70°C, and slowly dropwise add NaOH solution with a concentration of 5 mol / L until pH=7-8, then stop the dripping, and then keep stirring for 1 hour;

[0032] (5) Mix the solutio...

Embodiment 2

[0034] (1) First use nano-CaCO 3 SiO was prepared by the sol-gel method using sodium silicate as the silicon source as template. 2 / CaCO 3 Core-shell structure followed by removal of CaCO 3 template to obtain eggshell nano-hollow SiO 2 ;

[0035] (2) 2g eggshell nano hollow SiO obtained in step (1) 2 Disperse in 100 mL of deionized water at a solid-to-liquid ratio of 1:50, then add a CTAB solution with a concentration of 0.5 mol / L dissolved in absolute ethanol at a volume ratio of 2:1, heat and keep the temperature at 50 °C;

[0036] (3) with Ce (NO 3 ) 2 ·6H 2 O, Zr (NO 3 ) 4 ·5H 2 O is a raw material, respectively, according to the molar ratio of Ce:Zr=1:1, to prepare a solution with a salt concentration of 0.25mol / L;

[0037] (4) Stir the solution obtained in step (3) at a speed of 300 r / min at 70°C, and slowly dropwise add NaOH solution with a concentration of 5 mol / L until pH=7-8, then stop the dripping, and then keep stirring for 1 hour;

[0038] (5) Mix the ...

Embodiment 3

[0040] (1) First use nano-CaCO 3 SiO was prepared by the sol-gel method using sodium silicate as the silicon source as template. 2 / CaCO 3 Core-shell structure followed by removal of CaCO 3 template to obtain eggshell nano-hollow SiO 2 ;

[0041] (2) 2g eggshell nano hollow SiO obtained in step (1) 2 Disperse in 100 mL of deionized water at a solid-to-liquid ratio of 1:50, then add a CTAB solution with a concentration of 0.5 mol / L dissolved in absolute ethanol at a volume ratio of 2:1, heat and keep the temperature at 50 °C;

[0042] (3) with Ce (NO 3 ) 2 ·6H 2 O, Zr (NO 3 ) 4 ·5H 2 O is a raw material, respectively, according to the molar ratio of Ce:Zr=3:1, to prepare a solution with a salt concentration of 0.25mol / L;

[0043] (4) Stir the solution obtained in step (3) at a speed of 300 r / min at 70°C, and slowly dropwise add NaOH solution with a concentration of 5 mol / L until pH=7-8, then stop the dripping, and then keep stirring for 1 hour;

[0044] (5) Mix the ...

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PUM

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Abstract

The invention provides an egg-shell oxygen carrier and a preparation method of the egg-shell oxygen carrier. The preparation method comprises the following steps of: loading CeO2-ZrO2 on an egg-shell hollow nanometer SiO2 carrier so as to form a composite carrier with nanopore active components in a hollow structure; dispersing the egg-shell hollow nanometer SiO2 in deionized water; then adding CTAB solution; heating at a constant temperature; preparing a solution by using Ce(NO3)2.6H2O and Zr(NO3)4.5H2O as raw materials; slowly adding NaOH solution till the pH is 7-8; adding egg-shell hollow nanometer SiO2 solution for aging for 3-5h; then carrying out suction filtration and washing for multiple times; then drying and grinding; and finally roasting so as to obtain the egg-shell oxygen carrier. The obtained egg-shell oxygen carrier can be applied to preparing synthesis gas and hydrogen in a step manner. The egg-shell oxygen carrier is good in oxygen storage performance and can be applied in the preparation of synthesis gas and hydrogen in a methane conversion step manner, so that the methane conversion reaction is high in conversion rate and high in CO and H2 selectivity, and the purity of the hydrogen obtained through water-splitting is high.

Description

technical field [0001] The invention relates to an "eggshell type" composite oxygen carrier and a preparation method thereof, belonging to the technical field of energy catalysis. Background technique [0002] Methane conversion cascade production of synthesis gas and hydrogen technology, the reaction process can be expressed as: [0003] First level: MxOy+δCH4→MxOy-δ+δ(2H2+CO) (1) [0004] Second level: MxOy-δ+δH2O→MxOy+δH2 (2) [0005] (1) M in formula x o y is the oxygen carrier, and the first-order reaction is the synthesis gas production reaction, where M x o y It is reduced by CH4, loses lattice oxygen and becomes MxOy-δ, and generates synthesis gas (2H 2 +CO); the second stage is hydrogen production reaction, where MxOy-δ and H 2 O reacts with H 2 O is oxidized to MxOy-δ, and hydrogen gas (H 2 ). [0006] The total reaction can be expressed as: [0007] CH 4 +H 2 O→(2H 2 +CO) (syngas) + H 2 (pure hydrogen) (3) [0008] It can be found from the general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10C01B3/40
CPCY02P20/52
Inventor 魏永刚王华郑燕娥李孔斋祝星杜云鹏曾春华
Owner KUNMING UNIV OF SCI & TECH
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