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Preparation of manganese phthalocyanine-modified horn-like carbon-based catalyst and electroreduction of CO 2 method

A technology of carbon-based catalysts and manganese phthalocyanine, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve complex and diverse coordination structures and low Faradaic efficiency , low metal loading rate and other issues, to achieve the effect of promoting efficient reduction reaction, high specific surface area, and promoting conversion reaction

Active Publication Date: 2021-07-16
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, transition metal single atoms also have problems such as low metal loading rate and complex and diverse coordination structures (for example: metal-carbon, metal-nitrogen), which lead to CO 2 Reduced Faraday is less efficient

Method used

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  • Preparation of manganese phthalocyanine-modified horn-like carbon-based catalyst and electroreduction of CO <sub>2</sub> method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Take 23.3g of ammonium bromide and 1g of melamine, add 30mL of deionized water, ultrasonicate for 1h, stir for 24h, and then dry in a vacuum oven at 100°C for 8h to obtain a mixture. Take this mixture and place it in a crucible, put the crucible into a muffle furnace at room temperature, control the heating rate to 1.8°C / min, raise the temperature to 500°C, and then calcine at a constant temperature for 2 hours to obtain carbon nitride. Then put the carbon nitride into the tube furnace and feed nitrogen gas, control the heating rate of the tube furnace to 5°C / min, heat it to 600°C and then pyrolyze it at a constant temperature for 2 hours, and centrifuge the pyrolysis product three times with deionized water, Then place it in a vacuum oven at 60°C and dry to obtain a horn-shaped carbon-based catalyst. Take 0.6g of horn-like carbon-based catalyst, disperse it in 200mL of N-N-dimethylformamide solution, after ultrasonic treatment for 30min, add 50mg of manganese phthalocy...

Embodiment 2

[0038] Take 23.3g of ammonium bromide and 1g of melamine, add 30mL of deionized water, ultrasonicate for 1h, stir for 24h, and then dry in a vacuum oven at 100°C for 8h to obtain a mixture. Take this mixture and place it in a crucible, put the crucible into a muffle furnace at room temperature, control the heating rate to 1.8°C / min, raise the temperature to 500°C, and then calcine at a constant temperature for 2 hours to obtain carbon nitride. Then put the carbon nitride into the tube furnace and feed nitrogen, control the heating rate of the tube furnace to 5°C / min, heat to 700°C and then pyrolyze at a constant temperature for 2 hours, and centrifuge the pyrolysis product three times with deionized water, Then place it in a vacuum oven at 60°C and dry to obtain a horn-shaped carbon-based catalyst. Take 0.6g of horn-like carbon-based catalyst, disperse it in 200mL of N-N-dimethylformamide solution, after ultrasonic treatment for 30min, add 60mg of manganese phthalocyanine mole...

Embodiment 3

[0042] Take 23.3g of ammonium bromide and 1g of melamine, add 30mL of deionized water, ultrasonicate for 1h, stir for 24h, and then dry in a vacuum oven at 100°C for 8h to obtain a mixture. Take this mixture and place it in a crucible, put the crucible into a muffle furnace at room temperature, control the heating rate to 1.8°C / min, raise the temperature to 500°C, and then calcine at a constant temperature for 2 hours to obtain carbon nitride. Then put the carbon nitride into the tube furnace and feed nitrogen gas, control the heating rate of the tube furnace to 5°C / min, heat to 800°C and then pyrolyze at a constant temperature for 2 hours, and centrifuge the pyrolysis product three times with deionized water, Then place it in a vacuum oven at 60°C and dry to obtain a horn-shaped carbon-based catalyst. Take 0.6g of horn-shaped carbon-based catalyst, disperse it in 200mL of N-N-dimethylformamide solution, after ultrasonic treatment for 30min, add 70mg of manganese phthalocyanin...

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Abstract

The invention relates to the technical field of building materials, and aims to provide a method for preparing a horn-shaped carbon-based catalyst modified with manganese phthalocyanine. Including: calcining the mixture of ammonium bromide and melamine to obtain carbon nitride, which is pyrolyzed in a nitrogen atmosphere; the product is cleaned and dried to obtain a horn-shaped carbon-based catalyst; dispersed in N-N-dimethylformamide solution, ultrasonic treatment Afterwards, manganese phthalocyanine molecules are added, cleaned and dried after ultrasonic treatment and stirring to obtain a horn-shaped carbon-based catalyst modified with manganese phthalocyanine. The product of the invention has a rich porous structure, a relatively high specific surface area, a high content of pyridine nitrogen and pyrrole nitrogen active sites, good conductivity, and is an efficient cathode catalyst. A carbon-based catalyst with a horn-like structure has a tip effect to enrich charges under the action of an electric field and promote CO 2 Efficient reduction reaction. The manganese single atom in the manganese phthalocyanine molecule acts as the active site, which reduces the CO 2 The energy barrier for the reduction to the intermediate product COOH* promotes the CO 2 The conversion reaction to CO gas product has high Faradaic efficiency.

Description

technical field [0001] The present invention is about the greenhouse gas CO 2 conversion and utilization technology, especially the preparation of manganese phthalocyanine-modified horn-like carbon-based catalysts and the electroreduction of CO 2 method. Background technique [0002] Using wind power and photovoltaic energy storage to reduce and convert coal-fired flue gas CO 2 The production of renewable fuels is of great significance for energy saving, environmental protection and new energy development. Due to CO 2 Molecular chemical properties are stable, CO 2 The reduction process is accompanied by hydrogen evolution reaction, 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 Revert to renewable fuels. In recent years, researchers have improved the electrochemical reduction of CO 2 A lot of effort has been p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J35/02C25B1/23C25B1/50C25B11/095B01J35/00
CPCB01J31/183C25B1/00B01J2531/72B01J2531/025B01J2231/62B01J35/33B01J35/00B01J35/30
Inventor 程军岑可法周俊虎刘建忠杨卫娟王智化张彦威周志军何勇
Owner ZHEJIANG UNIV
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