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

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...

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.