Graphene-doped catalyst for production of methanol by means of carbon dioxide hydrogenation

A technology of carbon dioxide and nitrogen-doped graphene, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst activation/preparation, etc., to achieve enhanced activity, accelerated catalytic reactions, and good contact opportunities Effect

Inactive Publication Date: 2017-08-15
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But regarding the introduction of Cu/ZnO/Al into nitrogen-doped graphene 2 o 3 Catalysts have b

Method used

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  • Graphene-doped catalyst for production of methanol by means of carbon dioxide hydrogenation

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Embodiment 1

[0020] Embodiment 1: press Cu / ZnO / Al 2 o 3 =4 / 3 / 1 mass ratio, weigh Cu(NO 3 ) 2 ∙3H 2 O6.3g, Zn(NO 3 ) 2 ∙6H 2 O4.7g, Al(NO 3 ) 3 . 9H 2 O4.7g, dissolved in 54mL deionized water, weighed 10.6gNa 2 CO 3 Dissolve in 100mL deionized water, and flow in 200mL deionized water with stirring at 70°C for co-precipitation reaction, control pH = 7, continue stirring for 2h after precipitation, age at 30°C for 12h, filter, wash, vacuum overnight at 60°C Dry, pass N at 350°C 2 Calcined for 5h to obtain the catalyst.

Embodiment 2

[0021] Embodiment 2: press Cu / ZnO / Al 2 o 3 =4 / 3 / 2 mass ratio, weigh Cu(NO 3 ) 2 ∙3H 2 O6.0g, Zn(NO 3 ) 2 ∙6H 2 O4.5g, Al(NO 3 ) 3 . 9H 2 O4.5g, dissolved in 52mL deionized water, weighed 10.6gNa 2 CO 3 Dissolve in 100mL deionized water, weigh 0.16g nitrogen-doped graphene and dissolve it in 200mL deionized water, ultrasonicate for 30min, and flow the nitrate solution and precipitant together in the nitrogen-doped graphene solution under the condition of stirring at 70°C for co-precipitation Reaction, control pH = 7, continue to stir for 2 hours after the precipitation is complete, age at 30°C for 12 hours, filter, wash, dry overnight in vacuum at 60°C, pass N at 350°C 2 Calcined for 5h to obtain the catalyst.

Embodiment 3

[0022] Embodiment 3: by Cu / ZnO / Al 2 o 3 =4 / 3 / 3 mass ratio, weigh Cu(NO 3 ) 2 ∙3H 2 O5.8g, Zn(NO 3 ) 2 ∙6H 2 O4.4g, Al(NO 3 ) 3 . 9H 2 O4.4g, dissolved in 51mL deionized water, weighed 10.6gNa 2 CO 3 Dissolve in 100mL deionized water, weigh 0.28g nitrogen-doped graphene and dissolve it in 200mL deionized water, ultrasonicate for 30min, and flow the nitrate solution and precipitant together in the nitrogen-doped graphene solution under the condition of stirring at 70°C for co-precipitation Reaction, control pH = 7, continue to stir for 2 hours after the precipitation is complete, age at 30°C for 12 hours, filter, wash, dry overnight in vacuum at 60°C, pass N at 350°C 2 Calcined for 5h to obtain the catalyst. The solvent for dissolving and dispersing the nitrogen-doped graphene is a mixed solution of deionized deionized water and ethanol, and the surfactant polyvinylpyrrolidone PVP is added to facilitate dissolution by ultrasound.

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Abstract

The invention provides an improved catalyst for production of methanol by means of carbon dioxide hydrogenation, aiming at improving the catalytic activity and stability of the catalyst. The graphene-doped catalyst is prepared by using a parallel flow coprecipitating method; the invention in particular relates to nitrogen-doped graphene doped in the catalyst; the prepared catalyst utilizes the physical and chemical properties of the nitrogen-doped graphene, and the introduced nitrogen-doped graphene has the double functions of an auxiliary agent and a carrier and is high in gas absorption property and high in dispersity of metallic particles, so that the catalyst can easily form a catalytic activity center in a catalytic reaction, CO2 and H2 are easily absorbed, and the CO2 conversion rate, the methanol selectivity and the methanol yield are improved.

Description

technical field [0001] The invention belongs to the technical field of catalysts and relates to CO 2 The hydrogenation methanol catalyst further relates to a metal catalyst doped with nitrogen-doped graphene. Background technique [0002] CO 2 Hydrogenation of methanol is the conversion and utilization of CO 2 One of the important ways of the catalyst is copper catalyst, and the active center is copper. The specific surface area, pore size, lattice defects and grain size of copper ions all affect the catalytic activity of the catalyst. Auxiliaries can change the dispersion degree and electronic state of copper, and change the interaction between copper and the carrier. The research on auxiliaries and the preparation of catalysts with high activity and high stability are highly valued by researchers. [0003] Invention patent CN101444731 discloses a palladium-zinc catalyst involving carbon nanotube-based nanomaterials as a promoter for CO 2 Hydrogenation of methanol. Th...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J21/04B01J23/06B01J23/72B01J37/08C07C29/154C07C31/04
CPCB01J21/18B01J23/002B01J37/084B01J37/088B01J2523/00C07C29/154B01J2523/17B01J2523/27B01J2523/31C07C31/04Y02P20/52
Inventor 马清祥耿梦倩赵天生张建利范素兵范辉李鹏
Owner NINGXIA UNIVERSITY
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