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Sulfur ligand modified monatomic catalyst and preparation method and application thereof

A catalyst and sulfur compounding technology, applied in the direction of catalyst activation/preparation, catalyst, carbon compound catalyst, etc., can solve the problems of low utilization rate of metal atoms and high catalyst cost

Active Publication Date: 2021-09-10
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is an alloy or an intermetallic compound, the cost of the catalyst is high. At the same time, the utilization rate of metal atoms is low, and usually only the metal exposed on the surface is the active phase.

Method used

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  • Sulfur ligand modified monatomic catalyst and preparation method and application thereof
  • Sulfur ligand modified monatomic catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 1.0g of thiourea, 200.0mg of carbon nanotubes, and 50mL of absolute ethanol into a round-bottomed flask, stir and ultrasonically disperse for about 5 minutes to make them evenly mixed, and then stir at 25°C for 6 hours. The stirred dispersion liquid was transferred to a stainless steel hydrothermal kettle, and placed in an oven at 150°C for 8 hours. After the hydrothermal treatment, it was cooled to room temperature and centrifuged to obtain a black solid powder, which was then centrifuged and washed three times with ethanol, dried overnight in an oven at 60°C, and ground to obtain a sulfur-doped carbon material, marked as S-C-1#.

[0035] By XPS analysis, such as figure 1 As shown, the doping amount of S in the S-C-1# material can reach 6.0wt%, and the sulfur mainly exists in the form of thiophene sulfur in the carbon skeleton.

Embodiment 2

[0037] Weigh 2.0 g of thiourea, 200.0 mg of carbon nanotubes, and 50 mL of absolute ethanol into a round-bottomed flask, stir and ultrasonically disperse for about 5 minutes to make them evenly mixed, and then stir at 25°C for 6 hours. The stirred dispersion liquid was transferred to a stainless steel hydrothermal kettle, and placed in an oven at 150°C for 8 hours. After the hydrothermal treatment, it was cooled to room temperature and centrifuged to obtain a black solid powder, which was then centrifuged and washed three times with ethanol, dried overnight in an oven at 60°C, and ground to obtain a sulfur-doped carbon material, marked as S-C-2#.

[0038] According to XPS analysis, the doping amount of S in S-C-2# material can reach 8.3wt%, and sulfur mainly exists in the form of thiophene sulfur in the carbon skeleton.

Embodiment 3

[0040] Weigh 1.0g of sodium thiosulfate, 200.0mg of carbon fiber, and 50mL of water into a round-bottomed flask, stir and ultrasonically disperse for about 5 minutes to make them evenly mixed, and then stir at 25°C for 6 hours. The stirred dispersion was transferred to a stainless steel hydrothermal kettle, and placed in a 250°C oven for hydrothermal heating for 4 hours. After the hydrothermal treatment, it was cooled to room temperature and centrifuged to obtain a black solid powder, which was then centrifuged and washed three times with ethanol, dried overnight in an oven at 60°C, and ground to obtain a sulfur-doped carbon material, marked as S-C-3#.

[0041] According to XPS analysis, the doping amount of S in the S-C-3# material can reach 8.7wt%, and the sulfur mainly exists in the form of thiophene sulfur in the carbon skeleton.

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Abstract

The invention belongs to the field of catalysts, and particularly relates to a sulfur ligand modified monatomic catalyst and a preparation method and application thereof, the catalyst comprises an active metal component and a carrier, the active metal component is loaded on the carrier in a monatomic dispersion state, the active metal component is any one or more of Pd, Pt, Ru, Rh and Ir, and the carrier is a sulfur-doped carbon material. Controllable doping of sulfur in a carbon material is realized by adopting a sulfur source through a hydrothermal method or a high-temperature pyrolysis method, then an active metal precursor is impregnated on the sulfur-doped carbon material, and roasting activation is performed at a certain temperature to obtain the final catalyst. In the application of the catalyst, the catalyst has high catalytic activity, olefin selectivity and stability on a reaction for preparing the olefin compound through selective hydrogenation of the alkyne compound.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a sulfur ligand-modified single-atom catalyst and its preparation method and application. Background technique [0002] The research and application of catalysts and catalytic technologies is one of the core issues of the modern chemical industry. At present, 90% of chemical production is realized with the help of catalysts. Entering the 21st century, mankind is facing many major challenges such as decreasing fossil energy, increasingly severe environmental problems, and gradually deteriorating natural ecology. The chemical industry has shifted from the technology and experience of bulk chemicals to clean, efficient, and low-cost fine chemicals. . Under such a background, it is particularly urgent to design green catalysts with high regioselectivity and realize 100% atom-economical reactions. [0003] As a typical atom-economical reaction, the selective catalytic hydrogenat...

Claims

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Application Information

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IPC IPC(8): B01J27/02B01J37/10B01J37/08B01J37/02B01J37/18C07C5/09C07C15/46C07C11/02C07C15/44
CPCB01J27/02B01J37/10B01J37/082B01J37/0201B01J37/18B01J37/08C07C5/09C07C2527/02C07C15/46C07C11/02C07C15/44Y02P20/52
Inventor 刘文刚刘佳畅刘锡鲁
Owner QINGDAO UNIV OF SCI & TECH
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