Reduction method of copper zinc catalyst for hydrogen production by methanol steam reforming

A technology for reforming hydrogen production and catalysts, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of affecting catalyst activity, large investment, long reduction time, etc. The effect of low equipment investment and high operating cost

Active Publication Date: 2013-12-25
JIANGSU NUOMENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methanol steam reforming hydrogen production technology needs to use catalysts. At present, copper-zinc catalysts (CuO / ZnO) are mostly used, among which Cu is the main catalyst. Therefore, it is necessary to reduce the oxidized copper to Cu before use. The reaction equation is : CuO+H 2 --Cu+H 2 O, this reaction process is a large amount of exothermic process, so it is necessary to remove the heat released by the reduction. The traditional method is to use a large amount of nitrogen as the carrier gas and hydrogen as the reducing gas. This method usually uses a Roots blower to recycle nitrogen, so that This results in a large investment and a long recovery time
In addition, in industry, dilute methanol is usually used as the reducing medium, and the hydrogen produced by methanol cracking is used to reduce the catalyst. Usually, dilute methanol with a mass concentration of 2%-5% is used. This method is likely to cause a rapid rise in temperature and affect the activity of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Methanol steam reforming hydrogen production copper zinc catalyst 2 tons, the mass percentage of copper oxide in the catalyst is 65%, in the reactor catalyst bed, pass into the dry air that space velocity is 20h-1, by normal temperature at 20 degree / hour The heating rate was raised to 80°C, and then raised to 170°C at a rate of 5°C / hour until no physical water was discharged, the drying air was stopped, and the entire system was replaced with nitrogen.

[0021] Be warming up to 180 degrees, and pass into deionized water, the air space velocity of deionized water is 300h-1, pass into hydrogen, the space velocity of hydrogen is 8h-1, hydrogen accounts for the volume percentage of both is about 2.6%, with Raise the temperature to 200°C at a heating rate of 5°C / h, and then stop the heating at a rate of 2°C / h to 240°C, and maintain the system pressure at 0.2MPa.

[0022] To maintain the temperature of the catalyst bed, a 10% aqueous methanol solution was introduced, the liqu...

Embodiment 2

[0025] 4 tons of copper-zinc catalyst for hydrogen production by steam reforming of methanol, the mass percentage of copper oxide in the catalyst is 65%, and the dry air with a space velocity of 20h-1 is passed into the catalyst bed, and the temperature rise rate is 20 degrees / hour from normal temperature Raise to 80°C, and then raise the temperature to 170°C at a rate of 5°C / hour until no physical water is discharged, stop drying the air, and replace the entire system with nitrogen.

[0026] Be warming up to 180 degrees, and pass into deionized water, the gas space velocity of deionized water is 350h The temperature was raised to 200°C at a heating rate of 5°C / h, and then stopped at a rate of 4°C / h to 240°C, and the system pressure was maintained at 0.2MPa.

[0027] To maintain the temperature of the catalyst bed, a 15% aqueous methanol solution was introduced, and the liquid space velocity was 0.2h-1. The system pressure is controlled at 0.4MPa.

[0028] Detect the compone...

Embodiment 3

[0030] 8 tons of methanol steam reforming hydrogen production catalysts, the mass percentage of copper oxide in the catalyst is 60%, the dry air that passes into the catalyst bed with a space velocity of 30h-1 is raised from normal temperature to 80°C, and then raised to 170°C at a rate of 5°C / hour, until no physical water was discharged, the air was stopped, and the entire system was replaced with nitrogen.

[0031] Be warming up to 180 degree, and pass into deionized water, the gas space velocity of deionized water is 400h The temperature was raised to 200°C at a heating rate of 8°C / h, and then stopped at a rate of 2°C / h to 240°C, and the system pressure was maintained at 0.2MPa.

[0032] To maintain the temperature of the catalyst bed, 20% aqueous methanol solution was introduced, and the liquid space velocity was 0.2h-1. The system pressure is controlled at 0.3MPa.

[0033] Detect the components of the cracked gas, wherein the hydrogen content is about 74.2%, and the car...

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Abstract

The invention discloses a reduction method of a copper zinc catalyst for hydrogen production by methanol steam reforming, which is simple and safe in operation, and low in cost. The method comprises the following steps of: A) a copper zinc catalyst dehydration stage, that is, increasing the temperature of a cracking reactor, introducing dry air or inert gas with a space velocity of 10-30 h-1 into the reactor loaded with the copper zinc catalyst, increasing the temperature from 80 DEG C to 170 DEG C till no physical water is discharged; B) a copper zinc catalyst reduction stage, that is, continuing heating the reactor, introducing deionized water with a gas space velocity of the deionized water of 250-450 h-1 so as to establish a steam balanced system; introducing hydrogen with a space velocity of the hydrogen of 4-10 h-1 and a hydrogen volume percent of 0.5-4%, controlling the temperature at 180-240 DEG C; C) a copper zinc catalyst reduction strengthening stage, that is, maintaining the temperature of the catalyst bed layer, introducing a methanol aqueous solution with a mass concentration of 10-20% and a liquid space velocity of 0.1-0.3 h-1.

Description

technical field [0001] The invention relates to a method for reducing a catalyst for hydrogen production by steam reforming of methanol, more particularly to a method for reducing a copper-zinc catalyst for hydrogen production by steam reforming of methanol. Background technique [0002] Hydrogen is a form of energy that can be used as a clean energy source for transportation and power generation. With the increasingly stringent environmental regulations around the world and the society's attention to clean energy, the demand for hydrogen energy continues to grow. Hydrogen is also the raw material for the production of clean oil products. With the further improvement of fuel oil standards, the quality requirements for oil products are becoming more and more stringent, while the degree of inferiority of crude oil is getting higher and higher, thus making hydrofining, hydrocracking, etc. Deep processing technology has become an important processing technology in oil refinerie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B01J37/18C01B3/32
Inventor 梅华高传林
Owner JIANGSU NUOMENG CHEM
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