阅读说明：本技术 一种利用氧化铜纳米片制备逆水煤气氧化铁催化剂的方法 (Method for preparing inverse water gas ferric oxide catalyst by using copper oxide nanosheets ) 是由 张展 穆春丰 张欣 姚君 张馨予 贾楠楠 于 2020-04-30 设计创作，主要内容包括：本发明公开一种利用氧化铜纳米片制备逆水煤气氧化铁催化剂的方法,获得厚度均匀的氧化铁二维纳米片(20±3nm),并且所用原料药剂安全易得,用于逆水煤气催化,在较低温度300℃下表现出较高的催化反应活性,CO<Sub>2</Sub>转化率达到73.4％以上,该材料对逆水煤气反应和水煤气转化反应具有特别的价值。(The invention discloses a method for preparing a reverse water gas ferric oxide catalyst by using a copper oxide nanosheet, wherein a ferric oxide two-dimensional nanosheet (20 +/-3 nm) with uniform thickness is obtained, and raw material medicaments used for reverse water gas catalysis are safe and easily available, show higher catalytic reaction activity at a lower temperature of 300 ℃, and are CO 2 The conversion rate reaches over 73.4 percent, and the material has special value for reverse water gas reaction and water gas conversion reaction.)

1. A method for preparing a reverse water gas ferric oxide catalyst by using a copper oxide nanosheet is characterized by comprising the following steps:

1) mixing copper oxide nanosheets with deionized water in a mass ratio of 1: 1000-1: 2000, stirring for 2-5h at the rotating speed of 30-60r/min to fully disperse the copper oxide nano-sheets in the deionized water;

2) heating the solution to 50-80 ℃, and adding ferric sulfate heptahydrate [ FeSO ] with the same mole number as that of the copper oxide nanosheet at the temperature and at the rotating speed of 30-60r/min₄·7H₂O]Completely dissolving the mixture in the solution;

3) after stirring for 2-5h, the following reaction takes place:

2FeSO₄+2CuO+H₂O→Cu₂SO₄+Fe₂O₃+H₂SO₄(ii) a Simultaneous color of solutionGradually changing from black to dark orange; then separating the precipitate by filtration and washing with excess deionized water to remove unreacted iron precursor ions;

4) in order to remove the copper oxide nano-sheets, washing the precipitate with excessive alkali liquor to take away the complex produced by copper ions; rinsing until the filtrate is no longer blue;

5) the remaining orange sample was rinsed with deionized water and finally vacuum dried and crushed to give the iron oxide catalyst.

Technical Field

The invention belongs to the field of chemical industry, and relates to a method for preparing a reverse water gas ferric oxide catalyst by using a copper oxide nanosheet.

Background

The Water Gas (WGS) shift reaction has been studied for nearly a century with a relatively mature process. The reverse water gas shift Reaction (RWGS) can utilize abundant and cheap carbon dioxide as a carbon source, utilize carbon monoxide generated by the RWGS reaction as an intermediate product, and adopt an F-T synthesis method to prepare olefin; ethanol can also be produced using RWGS. The CAMERE process, which is currently widely used for the production of methanol, wherein the RWGS reaction at high temperature is the key step, the higher the carbon monoxide conversion, the more beneficial the methanol synthesis. Therefore, a high stability catalyst is critical for the CAMERE reaction.

The traditional RWGS catalyst mainly comprises zinc aluminate catalyst and Pt/CeO₂Catalysts, copper-based catalysts, manganese-based catalysts, and the like. Most of the catalysts contain noble metals, so the cost is high, and the catalysts are not suitable for large-scale industrial popularization. Therefore, in recent years, iron-based catalysts, the main component of which is iron oxide, have been developed in the industry as industrial catalysts for RWGS. At present, the iron oxide catalyst is mainly prepared by a precipitation method, and the method mainly comprises the steps of raw material dissolving and mixing, neutralization, hot boiling, washing, filtering, drying and roasting. Because RWGS is a heterogeneous reaction, catalysts are required to have a complex chemical composition and a specific physical structure. Different preparation methods are adopted, the chemical compositions of the catalysts are the same, but the physical structures of the catalysts are different, and the catalytic effect difference is larger. The iron oxide catalyst prepared by the precipitation method has the advantages of non-uniform particle size, low dispersity and poor catalytic effect.

Disclosure of Invention

In order to overcome the defects, the invention aims to provide a method for preparing a reverse water gas ferric oxide catalyst by using a copper oxide nanosheet.

In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:

a method for preparing a reverse water gas ferric oxide catalyst by using a copper oxide nanosheet is characterized by comprising the following steps:

1) mixing copper oxide nanosheets with deionized water in a mass ratio of 1: 1000-1: 2000, stirring for 2-5h at the rotating speed of 30-60r/min to fully disperse the copper oxide nano-sheets in the deionized water;

2) heating the solution to 50-80 ℃, and adding ferric sulfate heptahydrate [ FeSO ] with the same mole number as that of the copper oxide nanosheet at the temperature and at the rotating speed of 30-60r/min₄·7H₂O]Completely dissolving the mixture in the solution;

3) after stirring for 2-5h, the following reaction takes place:

2FeSO₄+2CuO+H₂O→Cu₂SO₄+Fe₂O₃+H₂SO₄(ii) a Meanwhile, the color of the solution gradually changes from black to dark orange; then separating the precipitate by filtration and washing with excess deionized water to remove unreacted iron precursor ions;

4) in order to remove the copper oxide nano-sheets, washing the precipitate with excessive alkali liquor to take away the complex produced by copper ions; rinsing until the filtrate is no longer blue;

5) the remaining orange sample was rinsed with deionized water and finally vacuum dried and crushed to give the iron oxide catalyst.

The method can obtain the following beneficial effects: the obtained ferric oxide two-dimensional nano-sheet (20 +/-3 nm) with uniform thickness is safe and easily obtained, is used for reverse water gas catalysis, shows higher catalytic reaction activity at a lower temperature of 300 ℃, and contains CO₂The conversion rate reaches over 73.4 percent, and the material has special value for reverse water gas reaction and water gas conversion reaction.

Detailed Description

The following description is given with reference to specific examples: