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Catalyst for production of methanol by CO2 hydrogenation

A catalyst and methanol production technology, which is applied in organic chemistry, bulk chemical production, hydroxyl compound preparation, etc., can solve the problems of low methanol selectivity, poor anti-poisoning performance, cumbersome preparation steps, etc., and achieve simple preparation process and high thermal conductivity The effect of inhibiting and preparing raw materials is cheap and easy to obtain

Inactive Publication Date: 2017-05-10
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional catalysts often have cumbersome preparation steps, poor repeatability, poor anti-poisoning performance, low mechanical strength, high production costs, and catalysts are prone to deactivation
also face CO 2 CO in hydrogenation to methanol 2 Bottlenecks such as low conversion rate and low methanol selectivity

Method used

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  • Catalyst for production of methanol by CO2 hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to Cu / ZnO / ZrO 2 =4 / 3 / 3 mass ratio weighs 6.1gCu(NO 3 ) 2 ·3H 2 O, 5.5gZn(NO 3 ) 2 ·6H 2 O, 3.3gZrO(NO 3 ) 2 2H 2 O, dissolved in deionized water as solution A, weighed 7.1g of anhydrous NaCO by 1mol / L solution 3 , dissolved in deionized water as Solution B. Use a peristaltic pump to drop solution A and solution B at the same time, and the dropping rate is 150mL h -1 , the stirring speed is 900r / min, the reaction temperature is 70°C water bath temperature, and the pH is controlled to be 7. After the dropwise addition, continue to stir for 120min, then age at 30°C for 12h, filter, dry overnight at 90°C, and pass through N at 350°C. 2 Calcined for 5 hours, granulated with 20-40 meshes to obtain catalyst sample 1, recorded as CuO-ZnO-ZrO 2 . The reduction condition of the catalyst is: H 2 / N 2 =5 / 95, temperature 300°C, pressure 0.1MPa, space velocity 2400h -1 ; Reaction conditions: H 2 / CO 2 =3, temperature 250°C, pressure 3.0MPa, W / F 10g·h / mol. ...

Embodiment 2

[0029] Graphene oxide was prepared by the modified Hummers method, first adding concentrated sulfuric acid (H 2 SO 4 , 115mL, 98%) was cooled in an ice bath. When the temperature of the system was lower than 5°C, flake graphite (5 g) was added. Stir for 30min, mix well, slowly add potassium permanganate (KMnO 4 , 15g), control the temperature of the reaction solution not to exceed 5°C, and stir for 1h. Then place the beaker in a constant temperature water bath at 30°C, continue to stir for 1 h, then add 230 mL of deionized water, and simultaneously add H 2 o 2 (30% aqueous solution, 25 mL), the solution changed from brick red to bright yellow, and the reaction was terminated. After standing for 12 hours, it was washed with dilute HCI (1:10 / volume ratio, 2L), frozen at -18°C, and then dried at -56°C using a freeze dryer to obtain a graphite oxide sample.

[0030] Measure 200mL of deionized water and dissolve it as solution A. Weigh 0.20g GO, press Cu / ZnO / ZrO 2 =4 / 3 / 3 ma...

Embodiment 3

[0032] Graphene oxide was prepared by the modified Hummers method, first adding concentrated sulfuric acid (H 2 SO 4 , 115mL, 98%) was cooled in an ice bath. When the temperature of the system was lower than 5°C, flake graphite (5 g) was added. Stir for 30min, mix well, slowly add potassium permanganate (KMnO 4 , 15g), control the temperature of the reaction solution not to exceed 5°C, and stir for 1h. Then place the beaker in a constant temperature water bath at 30°C, continue to stir for 1 h, then add 230 mL of deionized water, and simultaneously add H 2 o 2 (30% aqueous solution, 25 mL), the solution changed from brick red to bright yellow, and the reaction was terminated. After standing for 12 hours, it was washed with dilute HCl (1:10 / volume ratio, 2L), frozen at -18°C, and dried at -56°C using a freeze dryer to obtain a graphite oxide sample.

[0033] Measure 200mL of deionized water and dissolve it as solution A. Weigh 0.35g GO, press Cu / ZnO / ZrO 2 =4 / 3 / 3 mass ra...

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Abstract

The invention discloses a catalyst for production of methanol by CO2 hydrogenation. The invention is intended to overcome the problems of low CO2 conversion ratio and low methanol selectivity in a CO2 hydrogenation methanol synthesis process and studies a catalyst with Cu, ZnO, ZrO2 and graphene oxide (GO) as main components. The content, calculated in mass ratio, namely GO / Cu-ZnO-ZrO2, is (0.04-0.16) / 1, and the catalyst is prepared by adopting a parallel flow coprecipitation method. The preparation process is simple, conditions are easy to control, and repeatability is good. The catalyst disclosed by the invention has the advantages of easily adjustable and variable composition and structure, larger specific surface area, dispersed active components and good catalytic activity. In a CO2 hydrogenation methanol synthesis reaction, the CO2 conversion ratio and methanol selectivity are improved, CO2 emission reduction is achieved, and the catalyst is significant for solving increasingly serious environmental problems.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a 2 Catalyst for direct hydrogenation of methanol, its preparation method and application. Background technique [0002] The rapid development of modern industry has brought convenience and advancement to people's lives. At the same time, it has also produced some unfavorable factors for the environment, especially the large amount of carbon dioxide emissions, which has caused a sharp increase in the concentration of carbon dioxide in the atmosphere. CO 2 Emissions cause the greenhouse effect - warming the climate. CO 2 Emission reduction has a long way to go. How to reduce carbon dioxide emissions and reduce carbon dioxide in the air is a long-term and arduous task. CO 2 Research on the use of new technology includes synthesis of methanol, formic acid, polycarbonate, production of synthesis gas, ethanol, fuel oil, etc. Methanol has broad application prospects as a basic o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80C07C29/154C07C31/04
CPCY02P20/52B01J23/002B01J23/80C07C29/154C07C31/04
Inventor 赵天生张香玲马清祥张建利范辉彭娟
Owner NINGXIA UNIVERSITY
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