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Preparation method and application of nitrogen-heterocyclic carbene-modified nickel-iridium diatomic carbon-based catalyst

A nitrogen-heterocyclic carbene, carbon-based catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve problems such as lack and achieve well-developed porous structures , the effect of large specific surface area and strong electrical conductivity

Active Publication Date: 2021-11-26
ZHEJIANG UNIV
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Problems solved by technology

Chuan Zhao et al. prepared a three-dimensional porous carbon-based catalyst supported by nickel-iron diatoms for CO 2 Reduction reaction, which improves the performance of the catalytic reaction and makes the Faradaic efficiency of CO gas phase products reach 98%, but lacks liquid phase products such as alcohols

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  • Preparation method and application of nitrogen-heterocyclic carbene-modified nickel-iridium diatomic carbon-based catalyst

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preparation example Construction

[0031] Such as figure 1 Shown, provide a kind of preparation method of nitrogen-heterocyclic carbene modified nickel-iridium diatomic carbon-based catalyst, specifically comprise the steps:

[0032] (1) Take 5g of sodium citrate and 5g of potassium citrate and mix them evenly, place them in an electric heating tube furnace and feed in argon gas, start the electric heating furnace and control the heating rate to 10°C min -1 , heated to 800°C and then pyrolyzed at constant temperature for 2h. The pyrolysis product was treated with 0.5M H 2 SO 4 The solution and deionized water were washed three times by centrifugation, and then dried in a vacuum oven at 60°C to obtain a porous carbon material.

[0033] (2) Take 0.8g of the porous carbon material in step (1), 3mmol of nickel nitrate, 3mmol of iridium nitrate, 67mmol of glucose and 50mL of deionized water, mix and sonicate for 1h, then centrifuge (8000rpm) and dry at 80°C for 12h to obtain a solid product .

[0034](3) Mix th...

Embodiment 1

[0045] Take 5g of sodium citrate and 5g of potassium citrate and mix them evenly, place them in an electric heating tube furnace and feed in argon gas, start the electric heating furnace and control the heating rate to 10°C min -1 , heated to 800°C and then pyrolyzed at constant temperature for 2h. The pyrolysis product was treated with 0.5M H 2 SO 4 The solution and deionized water were washed three times by centrifugation, and then dried in a vacuum oven at 60°C to obtain a porous carbon material. Take 0.8g of porous carbon material, 3mmol of nickel nitrate, 3mmol of iridium nitrate, 67mmol of glucose and 50mL of deionized water, mix and sonicate for 1h, then centrifuge (8000rpm) and dry at 80°C for 12h to obtain a solid product. Mix the solid product with melamine, control the mass ratio to 1:4, put it in an electric heating tube furnace and feed nitrogen gas, start the electric heating furnace and control the temperature rise rate to 10°C min -1 , heated to 700° C. and ...

Embodiment 2

[0048] Take 5g of sodium citrate and 5g of potassium citrate and mix them evenly, place them in an electric heating tube furnace and feed in argon gas, start the electric heating furnace and control the heating rate to 10°C min -1 , heated to 800°C and then pyrolyzed at constant temperature for 2h. The pyrolysis product was treated with 0.5M H 2 SO 4 The solution and deionized water were washed three times by centrifugation, and then dried in a vacuum oven at 60°C to obtain a porous carbon material. Take 0.8g of porous carbon material, 3mmol of nickel nitrate, 3mmol of iridium nitrate, 67mmol of glucose and 50mL of deionized water, mix and sonicate for 1h, then centrifuge (8000rpm) and dry at 80°C for 12h to obtain a solid product. Mix the solid product with melamine, control the mass ratio to 1:5, place it in an electric heating tube furnace and feed nitrogen gas, start the electric heating furnace and control the temperature rise rate to 10°C min -1 , heated to 800° C. an...

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Abstract

The present invention relates to the gas CO 2 The conversion utilization technology aims to provide a preparation method and application of a nitrogen-heterocyclic carbene-modified nickel-iridium diatomic carbon-based catalyst. Including: pyrolyzing sodium citrate and potassium citrate to prepare porous carbon materials, mixing with nickel nitrate, iridium nitrate, glucose and deionized water for ultrasonic treatment, and calcining with melamine under nitrogen atmosphere; Carbon-based materials, oleic acid, oleylamine, and 1,2-hexadecanediol are added to 1-octadecene solution to heat and react to obtain oleylamine-modified nickel-iridium diatomic carbon-based materials; further combined with nitrogen-heterocyclic carbene molecules reaction to prepare nitrogen-heterocyclic carbene-modified nickel-iridium diatomic carbon-based catalysts. The catalyst of the present invention has significant advantages such as well-developed porous structure, large specific surface area, high content of pyridine nitrogen and pyrrole nitrogen, and strong conductivity; 2 The reduction reaction provides more charges, and the self-hydrophobicity inhibits the hydrogen evolution reaction, resulting in higher methanol selectivity and carbon atom conversion efficiency.

Description

technical field [0001] The present invention is about the greenhouse gas CO 2 conversion and utilization technology, especially the preparation method and application of nitrogen-heterocyclic carbene-modified nickel-iridium diatomic carbon-based catalysts. Background technique [0002] Conversion of coal-fired flue gas CO using wind and solar energy storage 2 The production of methanol and other hydrocarbons is of great significance for energy conservation, environmental protection and new energy development. Due to CO 2 Molecular chemical properties are stable, reducing CO 2 The reaction involves a multi-electron reduction process, so it is difficult to catalytically reduce CO with high efficiency and high selectivity. 2 . In order to solve these technical bottlenecks, it is urgent to develop efficient electrocatalysts to convert CO 2 Reduction to hydrocarbons, especially to produce alcohol products with high selectivity and low overpotential. [0003] In recent year...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J35/10C25B3/07C25B3/26C25B11/048
CPCB01J31/2273C25B11/04B01J35/33B01J35/61
Inventor 程军岑可法张彦威王智化周俊虎刘建忠杨卫娟周志军何勇
Owner ZHEJIANG UNIV
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