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Application of NiO/MgO solid solution catalyst in coke oven coal gas steam reforming hydrogen production method at low water carbon ratio

A technology of steam reforming and coke oven gas, which is applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., and can solve problems such as easy carbon deposition and catalyst pulverization

Inactive Publication Date: 2013-02-20
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these catalysts are used under the condition of low water-to-carbon ratio, it is very easy to deposit carbon, and when the carbon deposit is serious, it will also cause the pulverization of the catalyst

Method used

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  • Application of NiO/MgO solid solution catalyst in coke oven coal gas steam reforming hydrogen production method at low water carbon ratio
  • Application of NiO/MgO solid solution catalyst in coke oven coal gas steam reforming hydrogen production method at low water carbon ratio
  • Application of NiO/MgO solid solution catalyst in coke oven coal gas steam reforming hydrogen production method at low water carbon ratio

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preparation example Construction

[0024] The preparation method adopts co-precipitation and impregnation to prepare the catalyst. Among them, the co-precipitation preparation method is divided into conventional co-precipitation method and urea decomposition uniform co-precipitation method. The main preparation process and steps of the impregnation method are as follows:

[0025] (a) a certain amount of nickel salt is dissolved in deionized water at room temperature to prepare a solution of a certain concentration;

[0026] (b) immerse the magnesium oxide powder in the above mixed solution and stir at room temperature on a constant temperature magnetic stirrer for 12 hours, filter after standing for 12 hours, and then dry in an oven at 110°C;

[0027] (c) Put the dried catalyst into a muffle furnace, program the temperature rise to 800° C. for 5 hours at a heating rate of 5° C. per minute, and cool it to room temperature with the furnace after the heat preservation;

[0028] (d) Grind the calcined catalyst in...

Embodiment 1

[0037] Weigh 46.526g Ni(NO 3 ) 2 ·6H 2O was dissolved in 15ml of distilled water to form an aqueous solution of nickel nitrate. Then add 9.673g MgO to the nickel nitrate aqueous solution, stir well, mix well, stir fully on a constant temperature magnetic stirrer at room temperature for 12 hours, let it stand for 12 hours, filter, and then put the obtained solid in an oven at 110°C Bake for 3 hours. Then put it into a muffle furnace to program the temperature rise, and raise the temperature to 800° C. at a rate of 5° C. per minute for 5 hours, and then cool to room temperature with the furnace after the heat preservation. The calcined catalyst is then ground into powder and pressed into tablets with a pressure of 30KN. After the tablet is pressed, it is crushed and sieved to make catalyst particles of 20-40 mesh.

Embodiment 2

[0039] Weigh 46.526g Ni(NO 3 ) 2 ·6H 2 O, 61.538g Mg (NO 3 ) 2 ·6H 2 O was dissolved in 10ml of distilled water to form a mixed solution of nickel nitrate and magnesium nitrate. Stir well and evenly, after mixing, stir and evaporate to dryness on a constant temperature magnetic stirrer at 90°C-100°C, and then put it in an oven and bake at 110°C for 3 hours. Then put it into the muffle furnace to program the temperature rise, and raise the temperature to 800°C at a rate of 5°C per minute and keep it for 4 hours. room temperature. The calcined catalyst was ground into powder and pressed into tablets with a pressure of 30KN. After the tablet is pressed, it is put into the muffle furnace and the temperature is raised to 1200° C. at a rate of 5° C. per minute and kept for 10 hours. After cooling with the furnace, take out the diaphragm, crush and sieve to make catalyst particles of 20-40 mesh.

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Abstract

The present invention relates to an application of a NiO / MgO solid solution catalyst in a coke oven coal gas steam reforming hydrogen production method at a low water carbon ratio, wherein a mass percentage of Ni is 6.9-43%, and the catalyst has characteristics of simple preparation process, high activity at a high temperature and a low water carbon ratio, no carbon deposition and good stability. According to the present invention, during a reforming process at a temperature of 875 DEG C and a H2O / CH4 ratio of 1, a methane conversion rate is maintained to 95-98%, and a carbon dioxide conversion rate is maintained to 52-54%; at a temperature of 875 DEG C and SV of 12600 mL / g.h, when a H2O / CH4 molar ratio is increased to 0.9 from 0.3, a methane conversion rate is correspondingly increased to 98.3% while a carbon dioxide conversion rate is reduced to 67.2% from 88. 4%; and when a reaction temperature is increased to 900 DEG C from 600 DEG C, a methane conversion rate and a carbon dioxide conversion rate are respectively increased to 98.7% and 601%.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a nickel-magnesium solid solution catalyst for coke oven gas steam reforming to produce hydrogen and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] my country is the world's largest coke producer, consumer and exporter. In 2010, the output of coke was more than 388 million tons. According to 1.33 tons of dry coal to produce 1 ton of coke and 1 ton of dry coal to produce 320m 3 Calculated by coke oven gas, the total output of coke oven gas is about 165.1 billion Nm 3 . Coke oven gas contains about 55% hydrogen and 25% methane (volume fraction), and is a potential raw material for hydrogen production. The analysis shows that using coke oven gas to produce hydrogen can not only achieve good energy efficiency, but also reduce greenhouse gas emissions, which is a particularly worthy of consideration for hydro...

Claims

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Application Information

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IPC IPC(8): C01B3/40B01J23/755
CPCY02P20/52
Inventor 杨志彬丁伟中王芳
Owner JIANGSU UNIV OF SCI & TECH
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