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Magnetic oxygen carrier in hydrogen-rich syngas prepared by coal chemical looping gasification and preparation thereof

An oxygen carrier and chemical chain technology, which is applied in the field of preparation of oxygen carrier particles, can solve the problems of easy sintering and decreased cycle stability, and achieve the effects of efficient separation, simple preparation method, and stable catalytic water-vapor shift reaction.

Inactive Publication Date: 2019-03-08
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All three ferrites can be regenerated after five cycles, among which CuFe 2 o 4 and CoFe 2 o 4 exhibit better thermal stability, but NiFe 2 o 4 Sintering is prone to occur during chemical looping gasification of biomass, resulting in decreased cycle stability

Method used

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  • Magnetic oxygen carrier in hydrogen-rich syngas prepared by coal chemical looping gasification and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 11.63gNi(NO 3 ) 2 ·6H 2 O and 32.32gFe(NO 3 ) 2 ·6H 2 Put O into a 500ml beaker, add 200ml of distilled water, stir until completely dissolved, and obtain A solution. Then take 9.12g of sodium borohydride and put it into a 500ml beaker, add 280ml of distilled water, stir until completely dissolved, and obtain B solution. Slowly and evenly add the above liquids A and B into the colloid mill, and stir for 3 minutes. Then add 1.06g of attapulgite, continue to stir for 1min, and transfer the above mixed solution to an autoclave with a 500ml polytetrafluoroethylene liner. Put the reactor into a drying oven at 150°C for hydrothermal crystallization for 12 hours. Then take out the reaction kettle, cool to room temperature naturally, centrifuge and wash to obtain NiFe 2 o 4 / Attapulgite composite oxygen carrier particles. After drying naturally in the air, put it in a muffle furnace, and raise the temperature from room temperature to 950°C at a rate of 3°C / min fo...

Embodiment 2

[0023] Take 11.63gNi(NO 3 ) 2 ·6H 2 O and 32.32gFe(NO 3 ) 2 ·6H 2 Put O into a 500ml beaker, add 200ml of distilled water, stir until completely dissolved, and obtain A solution. Then take 9.12g of sodium borohydride and put it into a 500ml beaker, add 280ml of distilled water, stir until completely dissolved, and obtain B solution. Slowly and evenly add the above liquids A and B into the colloid mill, and stir for 3 minutes. Then add 2.34g of attapulgite, continue to stir for 1min, and transfer the above-mentioned mixed solution to an autoclave with a 500ml polytetrafluoroethylene liner. Put the reactor into a drying oven at 150°C for hydrothermal crystallization for 12 hours. Then take out the reaction kettle, cool to room temperature naturally, centrifuge and wash to obtain NiFe 2 o 4 / Attapulgite composite oxygen carrier particles. After drying naturally in the air, put it in a muffle furnace, and raise the temperature from room temperature to 950°C at a rate of ...

Embodiment 3

[0025] Take 11.63gNi(NO 3 ) 2 ·6H2 O and 32.32gFe(NO 3 ) 2 ·6H 2 Put O into a 500ml beaker, add 200ml of distilled water, stir until completely dissolved, and obtain A solution. Then take 9.12g of sodium borohydride and put it into a 500ml beaker, add 280ml of distilled water, stir until completely dissolved, and obtain B solution. Slowly and evenly add the above liquids A and B into the colloid mill, and stir for 3 minutes. Then add 4.01 g of attapulgite, continue to stir for 1 min, and transfer the above-mentioned mixed solution to an autoclave with a 500 ml polytetrafluoroethylene liner. Put the reactor into a drying oven at 150°C for hydrothermal crystallization for 12 hours. Then take out the reaction kettle, cool naturally to room temperature, centrifuge and wash to obtain NiFe2O4 / attapulgite composite oxygen carrier particles. After drying naturally in the air, put it in a muffle furnace, raise the temperature from room temperature to 950°C at a rate of 3°C / min a...

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Abstract

The invention relates to an oxygen carrier NiFe2O4 of a magnetic oxygen carrier and a preparation method of the oxygen carrier. The preparation method comprises the following steps: adopting a redox process, controlling appropriate reaction conditions, and preparing the oxygen carrier with high stability and magnetism by a one-step process. The oxygen carrier prepared by the method is a compositeoxygen carrier composed of NiFe2O4 and attapulgite, the NiFe2O4 is highly dispersed on the surface of the attapulgite, elements such as magnesium and calcium in the attapulgite inhibit deep reductionof the NiFe2O4, and the reduced valence is effectively controlled to Fe3O4, so that the water gas shift reaction is further enhanced, and sintering resistance of the oxygen carrier is improved. The method has the advantages of simple preparation, high oxygen carrier stability and the like. Meanwhile, high-efficiency separation of the oxygen carrier, unburned coal, burned ash and other solid particles can be realized in the coal chemical looping gasification process.

Description

technical field [0001] The invention belongs to the technical field of preparation of oxygen carrier particles in coal chemical chain gasification technology. Specifically relate to a kind of NiFe of magnetic oxygen carrier 2 o 4 Oxygen carrier and its preparation method. Background technique [0002] Oxygen carrier is the key to coal chemical looping gasification. An excellent oxygen carrier should have high redox reaction activity, good mechanical strength, anti-sintering and anti-agglomeration ability, economical efficiency and environmental friendliness. The transition metal elements nickel, iron, copper, cobalt, and manganese are considered to be ideal candidates for oxygen carriers, but these materials suffer from various defects. Generally, copper oxide has a low melting point and is prone to sintering, manganese oxide and iron oxide have low oxygen-carrying capacity and weak reactivity, and nickel oxide and cobalt oxide have adverse effects on the environment. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J35/00B01J37/08B01J37/10B01J37/12B01J37/16
CPCB01J23/005B01J23/78B01J37/08B01J37/10B01J37/12B01J37/16B01J35/33
Inventor 郭庆杰安梅胡修德
Owner NINGXIA UNIVERSITY
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