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Catalyst for hydrogenation synthesis of methanol by using carbon dioxide and preparation and application thereof

A technology for synthesizing methanol from carbon dioxide, which is applied in the preparation of organic compounds, catalyst activation/preparation, and preparation of hydroxyl compounds. It can solve the problems of catalyst particle sintering, reduced catalyst activity, and low selectivity of methanol, and achieves mild and high preparation conditions. The effect of methanol synthesis activity and simple preparation method

Inactive Publication Date: 2017-09-22
QUZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The main advantages of preparing Cu / ZnO catalyst by co-precipitation method are small catalyst particle size, uniform distribution of components, mild reaction conditions and low equipment investment, so it is widely used in production, but it has the following disadvantages: 1) Co-precipitation method It is very sensitive to the pH value of the solution during the precipitation process, and it is necessary to accurately control the pH value of the solution; 2) The catalyst needs to be roasted and reduced at high temperature, and the catalyst particles will be sintered, and the energy consumption is high; 3) The Cu prepared by the co-precipitation method / ZnO catalyst residual alkali metal ions reduce catalyst activity; 4) The selectivity of methanol on Cu / ZnO catalyst prepared by co-precipitation method is low

Method used

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  • Catalyst for hydrogenation synthesis of methanol by using carbon dioxide and preparation and application thereof
  • Catalyst for hydrogenation synthesis of methanol by using carbon dioxide and preparation and application thereof
  • Catalyst for hydrogenation synthesis of methanol by using carbon dioxide and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) 96mmol Zn (carbon dioxide CH 3 ) 2 2H 2 O was dissolved in 240 mL of deionized water, and 96 mmol of diethylenetriamine was added with continuous stirring. After dissolving, the solution was transferred to a 500 mL polytetrafluoroethylene-lined autoclave, kept at 100 °C for 3 h, and then slowly cooled to room temperature. The white precipitate was washed with deionized water, and finally dried at 60 °C for 12 h to obtain cylindrical ZnO, as figure 2 shown.

[0032] (2) 20mmol of Cu (carbon dioxide CH 3 ) 2 ·H 2 O was dissolved in 400 mL of deionized water, 10 mmol of cylindrical ZnO was added under continuous stirring, and the temperature of the solution was raised to 80 °C. Under continuous stirring, slowly drop 40 mL of L-ascorbic acid solution with a concentration of 3 mol / L to reduce copper ions. After the dropwise addition, keep warm for 5 hours, filter with suction, wash, and dry in vacuum at 60° C. for 12 hours. The catalyst is marked as Cu / cylindric...

Embodiment 2

[0034] The same operation as in Example 1 was used to prepare the catalyst, except that 192mmol Zn (carbon dioxide CH 3 ) 22H 2 O was dissolved in 240 mL of deionized water, and 192 mmol of hexamethylenetetramine was added under continuous stirring. The catalyst was labeled as Cu / filamentous ZnO catalyst, and filamentous ZnO as image 3 shown.

Embodiment 3

[0036] (1) Dissolve 24mmol of zinc nitrate in 240mL of deionized water, and add 24mmol of hexamethylenetetramine under continuous stirring. After dissolving, the solution was transferred to a 500 mL polytetrafluoroethylene-lined autoclave, kept at 150 °C for 6 h, and then slowly cooled to room temperature. The white precipitate was washed with deionized water, and finally dried at 60 °C for 12 h to obtain cylindrical ZnO.

[0037] (2) Dissolve 40 mmol of copper nitrate in 100 mL of deionized water, add 10 mmol of cylindrical ZnO under continuous stirring, and heat the solution to 40°C. Under continuous stirring, slowly dropwise add 80 mL of ethylene glycol solution with a concentration of 0.5 mol / L to reduce copper ions. After the dropwise addition, keep warm for 1 hour, filter with suction, wash, and dry in vacuum at 60° C. for 12 hours. The catalyst is marked as Cu / cylindrical ZnO.

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Abstract

The invention provides a catalyst for hydrogenation synthesis of methanol by using carbon dioxide and preparation and application thereof. The catalyst is a mixture of Cu and special-form ZnO, the molar ratio of Cu to ZnO is (0.5 to 4):1, and the ZnO is in a wire or cylinder shape. The catalyst has the advantages that the particle size of Cu is small, the surface area for Cu exposing is large, the ZnO exists in the special form, and multiple oxygen vacancies exist; compared with the catalyst prepared by the traditional method, the synthesis activity of the methanol is higher; when the catalyst is applied into the technology for hydrogenation synthesis of methanol by using carbon dioxide, the conversion rate of the carbon dioxide reaches 20.2%, and the selectivity of the methanol can reach 86.3%.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for carbon dioxide hydrogenation to synthesize methanol and its preparation and application. Background technique [0002] In recent years, more than 85% of the world's energy comes from fossil resources, and the combustion of fossil resources emits a large amount of carbon dioxide. The increase in the concentration of carbon dioxide in the atmosphere has led to global climate change, which has seriously affected and threatened human beings and the earth environment on which human beings depend. Reducing the emission of carbon dioxide will be an important issue faced by scientists and technicians of various countries in the future. The most effective way to reduce carbon dioxide emissions is to reduce the use of fossil energy and to recycle carbon resources. Due to technical and economic difficulties in the development and use of new energy, it is diffi...

Claims

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Application Information

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IPC IPC(8): B01J23/80B01J37/16C07C29/154C07C31/04
CPCY02P20/52B01J23/80B01J37/16C07C29/154C07C31/04
Inventor 雷宏柴嘉良孙周瑜谢建伟郑启富
Owner QUZHOU UNIV
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