A kind of layered structure copper-based catalyst and its preparation method and application

A copper-based catalyst, layered structure technology, applied in the preparation of hydroxyl compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of poor methanol selectivity, large specific surface area, low conversion rate, etc., and achieve stable reaction performance. , The effect of high catalytic activity and reduction of copper loss

Active Publication Date: 2018-05-04
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to overcome the defective of prior art, provide a kind of layered structure copper-based catalyst and its preparation method and application, described layered structure copper-based catalyst specific surface area is big, the loss of copper is little and dispersion degree is high, has It is beneficial to the adsorption and activation of the reactants, and overcomes the shortcomings of the existing carbon dioxide hydrogenation synthesis methanol catalyst, which has a low conversion rate of carbon dioxide and poor methanol selectivity.

Method used

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  • A kind of layered structure copper-based catalyst and its preparation method and application
  • A kind of layered structure copper-based catalyst and its preparation method and application
  • A kind of layered structure copper-based catalyst and its preparation method and application

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Embodiment 1

[0037] Take an appropriate amount of copper nitrate, zinc nitrate, aluminum nitrate, of which Cu 2+ , Zn 2+ and Al 3+ The ratio of the metal is based on the metal, and the molar ratio of various metals is: [n(Cu)+n(Zn)] / n(Al)=2, n(Cu) / n(Zn)=0.5, formulated as total metal ions The concentration of the mixed aqueous solution is 0.5mol / L, the mixed aqueous solution is heated to 80°C, the urea solution is added dropwise to the mixed aqueous solution through a peristaltic pump, and the speed of the peristaltic pump is 45r / min, wherein the concentration of the urea solution is urea: ∑M + =1:1(∑M + is the sum of the total metal ion concentration). During the dropwise addition process, an appropriate amount of nitrogen gas was continuously introduced, and the nitrogen flow rate was controlled by a mass flow meter, and the flow rate was 5 mL / min. Reflux for 6 hours, cool the precipitate, filter, wash, and dry (the drying temperature is 80°C, the drying time is 12h), and then roaste...

Embodiment 2

[0039] Take an appropriate amount of copper nitrate, zinc nitrate, aluminum nitrate, of which Cu 2+ , Zn 2+ and Al 3+ The ratio of the metal is based on the metal, and the molar ratio of various metals is: [n(Cu)+n(Zn)] / n(Al)=4, n(Cu) / n(Zn)=3, formulated as a total metal ion Concentration of 2.0mol / L mixed aqueous solution, heat the mixed aqueous solution to 80°C, urea solution is added dropwise to the mixed aqueous solution through a peristaltic pump, the speed of the peristaltic pump is 80r / min, and the concentration of the urea solution is urea: ∑M + =2.5:1(∑M + is the sum of the total metal ion concentration). During the dropwise addition, an appropriate amount of nitrogen gas was continuously introduced, and the nitrogen flow rate was controlled by a mass flow meter, and the flow rate was 20 mL / min. Reflux for 12 hours, cool the precipitate, filter, wash, and dry (the drying temperature is 100°C, the drying time is 24h), and then roasted at 350°C for 3 hours to obtain...

Embodiment 3

[0041] Take an appropriate amount of copper nitrate, zinc nitrate, aluminum nitrate, of which Cu 2+ , Zn 2+ and Al 3+ The proportion of the metal is calculated, and the molar ratio of various metals is: [n(Cu)+n(Zn)] / n(Al)=6, n(Cu) / n(Zn)=1.5, and the total metal ion is prepared The concentration of the mixed aqueous solution is 3.0mol / L, the mixed aqueous solution is heated to 110°C, the urea solution is added dropwise into the mixed aqueous solution through a peristaltic pump, and the speed of the peristaltic pump is 70r / min, wherein the concentration of the urea solution is urea: ∑M + =6:1(∑M + is the sum of the total metal ion concentration). During the dropwise addition, an appropriate amount of nitrogen gas was continuously introduced, and the nitrogen flow rate was controlled by a mass flow meter, and the flow rate was 8 mL / min. Reflux for 48 hours, cool the precipitate, filter, wash, and dry (the drying temperature is 100°C, the drying time is 24h), and then roasted...

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Abstract

The invention discloses a layered structure copper-based catalyst and its preparation method and application. The layered structure copper-based catalyst comprises the following components in weight percentage: Cu: 26-65%; ZnO: 22-52%; Al2O3 :6‑22%. The copper-based catalyst with a layered structure of the present invention has a large specific surface area, a small loss of copper and a high degree of dispersion, which is beneficial to the adsorption and activation of reactants, and overcomes the low conversion rate of catalytic carbon dioxide and methanol selectivity of existing carbon dioxide hydrogenation methanol synthesis catalysts. Poor disadvantages.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a copper-based catalyst with a layered structure, a preparation method thereof and an application in carbon dioxide hydrogenation synthesis of methanol. Background technique [0002] The gradual increase of carbon dioxide emissions in the atmosphere is one of the causes of the greenhouse effect. In addition, the scarcity of fossil fuels has attracted worldwide attention. Methanol is an important chemical raw material, and it is also a clean fuel with development prospects. The hydrogenation of carbon dioxide into methanol can alleviate energy shortage and is expected to solve greenhouse gas control. This process has multiple meanings in chemical industry, energy, and environmental protection. However, carbon dioxide is very stable and difficult to activate, so the key to this process is the development of highly active catalysts. [0003] In industry, the synthesis gas containing carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B01J35/10C07C31/04C07C29/154
CPCY02P20/52
Inventor 王慧肖硕高鹏孙予罕魏伟夏林张建明杨海艳
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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