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Difunctional Cu-based desulfurization catalyst, and preparation method and application thereof

A desulfurization catalyst and dual-function technology, applied in the field of dual-function Cu-based desulfurization catalyst and its preparation, can solve the problems of limiting catalyst application, easy loss of active components, affecting service life, etc., and achieves good H2S adsorption and excellent catalytic activity. and stable, efficient removal effect

Pending Publication Date: 2021-11-19
FUZHOU UNIV ASSET MANAGEMENT CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these catalysts are complex in composition (blast furnace gas contains H 2 O water vapor, CO, CO 2 , O 2 , hydrocarbons and trace sulfide gases) under the actual working conditions, the loaded active components are easy to lose, leading to catalyst deactivation, and easy to corrode the pipeline
In addition, the sulfate and carbonate produced during the reaction will deposit on the surface of the catalyst and easily lead to its poisoning, thereby affecting its service life
At the same time, the H produced by the reaction 2 S and H associated with blast furnace gas 2 S also needs to be removed with additional desulfurizers, which also limits the application of these catalysts

Method used

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  • Difunctional Cu-based desulfurization catalyst, and preparation method and application thereof
  • Difunctional Cu-based desulfurization catalyst, and preparation method and application thereof
  • Difunctional Cu-based desulfurization catalyst, and preparation method and application thereof

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preparation example Construction

[0035] The present invention also provides a preparation method of a bifunctional Cu-based desulfurization catalyst, comprising the steps of:

[0036] S1. Preparation of graphite phase carbon nitride: use one or more of urea, cyanamide, dicyandiamide, melamine, thiocyanate, and thiourea as precursors, and heat up in air or nitrogen atmosphere Keep at 500-600°C for 1-4 hours, and cool to room temperature to obtain graphite phase carbon nitride;

[0037] S2. Preparation of copper atoms embedded on the nitrogen-doped carbon nanosheet carrier: first, the graphite phase carbon nitride and bromine-containing phenolic compound prepared in step S1 are dispersed and dissolved in the mixed solution of ethanol and water, and then the corresponding Cu precursor and nitrogen-containing organic compound are added to the above solution, stirred and evaporated to dryness at 60-100°C to obtain an intermediate, and the evaporated intermediate is ground into a powder, placed in a heating device,...

Embodiment 1

[0043] Preparation of catalyst NC (without Cu precursor and nitrogen-containing organic compound):

[0044] Dissolve 2g of graphitic carbon nitride and 2g of tetrabromobisphenol A in a mixture of 20mL of water and 20mL of ethanol, stir and evaporate to dryness at 80°C. The evaporated sample was ground into powder, placed in a heating device, and heated to 800°C at a rate of 2.3°C / min under a nitrogen atmosphere, and pyrolyzed for 3 hours. After naturally cooling to room temperature, the synthesized samples were collected to obtain the catalyst, which was named NC.

Embodiment 2

[0046] Bifunctional Cu-based desulfurization catalyst CuN of the present invention 4 Preparation of / NC:

[0047] 2g graphite phase carbon nitride and 2g tetrabromobisphenol A were dissolved in 20mL water and 20mL ethanol mixture, then 0.248g Cu(NO 3 ) 2 ·3H 2 O and 0.18g porphyrin were added to the above solution, stirred and evaporated to dryness at 80°C. The evaporated sample was ground into powder, placed in a heating device, and heated to 800°C at a rate of 2.3°C / min under a nitrogen atmosphere, and pyrolyzed for 3 hours. After natural cooling to room temperature, the as-synthesized samples were collected to obtain a single-atom Cu-modified nitrogen-doped carbon catalyst with a nanolayered structure, named CuN 4 / NC.

[0048] From Figure 1-Figure 4 It can be seen that the prepared CuN 4 Cu in the / NC catalyst presents a single-atom dispersion, no metal clusters or particles are found, and Cu and N form Cu-N 4 Coordination, Cu is uniformly distributed on the NC na...

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Abstract

The invention discloses a bifunctional Cu-based desulfurization catalyst, and a preparation method and application thereof. The catalyst comprises a nitrogen-doped carbon nanosheet carrier and active metal Cu which is loaded on the carrier and dispersed in a monatomic form. The monatomic Cu-based desulfurization catalyst provided by the invention is of a porous two-dimensional sheet structure and has a large specific surface area and pore volume, regulation and optimization of a Cu atomic electronic structure are realized through coordination between Cu and N species, the monatomic Cu-based desulfurization catalyst shows outstanding catalytic activity and stability in a low-temperature COS hydrolysis reaction, and the performance of the monatomic Cu-based desulfurization catalyst is better than that of commercial catalysts 10K2CO3 / Al2O3 and CuO. Meanwhile, the prepared Cu-based catalyst can deeply remove low-concentration H2S, and compared with a bulk-phase CuO catalyst, the Cu-based catalyst has better adsorption performance, is not prone to poisoning and inactivation, can be recycled and has a huge industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of material preparation and environmental catalysis, in particular to a dual-functional Cu-based desulfurization catalyst and its preparation method and application. Background technique [0002] Iron and steel is a basic and pillar industry related to the national economy and people's livelihood. In 2020, my country's steel output will reach 1.065 billion tons, accounting for 56% of the world's total crude steel output. The basic principle of iron and steel smelting is to put iron ore, coke, oil, coal or natural gas and other raw materials into the blast furnace for calcination, and use the CO and H2 produced by coke combustion to reduce and refine the iron oxide in the iron ore into pig iron. The blast furnace ironmaking process will produce a huge amount of by-product blast furnace gas, such as refining one ton of pig iron will produce about 1800-2000m 3 blast furnace gas. In 2020, my country's blast fu...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C10K1/00C10K1/34
CPCB01J27/24C10K1/34C10K1/004B01J35/63B01J35/61
Inventor 江莉龙雷淦昌梁诗景曹彦宁郑勇肖益鸿
Owner FUZHOU UNIV ASSET MANAGEMENT CO LTD
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