Monoatom and particle synergistic supported metal catalyst as well as preparation method and application thereof

A metal catalyst, metal technology, applied in catalyst activation/preparation, molecular sieve catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of poor selectivity, low activity, harsh reaction conditions, etc. The effect of presentability, high catalytic activity and simple preparation method

Active Publication Date: 2021-07-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a single atom and particle synergistic supported metal catalyst and its preparation method and application. The hydrogenation reaction shows excellent activity and selectivity, which can effectively solve the problems of harsh reaction conditions, low activity and poor selectivity of existing quinoline hydrogenation catalysts

Method used

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  • Monoatom and particle synergistic supported metal catalyst as well as preparation method and application thereof
  • Monoatom and particle synergistic supported metal catalyst as well as preparation method and application thereof
  • Monoatom and particle synergistic supported metal catalyst as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0040] The preparation method of the metal catalyst provided by the invention comprises the following steps: (1) immersing the carrier in a solution composed of a metal salt and a solvent, removing the solvent after the immersion to obtain a metal catalyst precursor; (2) heating the metal catalyst precursor Then, a supported metal catalyst with synergy between single atoms and particles can be obtained. The invention utilizes a simple impregnation method and a high-temperature pyrolysis method to prepare a single-atom-particle synergistic supported metal catalyst, and the metal precursor is loaded on the surface of the carrier by the impregnation method. Due to the high specific surface area of ​​the carrier, during the high-temperature pyrolysis process, the metal The salt precursor is decomposed and anchored inside the pores of the support in the form of single atoms and particles coexisting, thus obtaining a metal catalyst with support-supported single atoms and particles. ...

Embodiment 1

[0046] Example 1. Preparation and application of mesoporous carbon-supported single atom and particle synergistic iridium metal catalyst

[0047] The mesoporous carbon-supported single-atom-particle synergistic iridium metal catalyst was prepared according to the following steps:

[0048] (1) Weigh 5 mg of iridium acetylacetonate into a 25 mL single-necked bottle, add 5 mL of acetone, and stir for 15 minutes. Weigh 100mg of CMK-3 and add it into the above solution, stir at 400r / min for 6 hours, and then spin evaporate at 30°C and 100rpm for 15 minutes.

[0049] (2) Place the solid powder obtained after the rotary steaming in step (1) in a porcelain boat, and perform pyrolysis in a tube furnace. In an argon atmosphere, the temperature was raised to 600°C at a heating rate of 5°C / min and kept for 2h, and then naturally cooled to room temperature to obtain a mesoporous carbon-supported single-atom and particle-coordinated iridium metal catalyst Ir- CMK-3.

[0050] The spherica...

Embodiment 2

[0057] Example 2, Preparation and Application of Activated Carbon-supported Single Atom and Particle Synergistic Ruthenium Metal Catalyst

[0058] Activated carbon-supported single atom and particle synergistic ruthenium metal catalysts were prepared according to the following steps

[0059] (1) Weigh 10 mg of ruthenium acetylacetonate into a 25 mL single-necked bottle, add 5 mL of acetone, and stir for 15 minutes. Weighed 100mg of activated carbon (Vulcan XC-72R Active carbon purchased from Cabot Company) was added to the aforementioned solution, stirred at 400r / min for 6 hours, and then rotary evaporated at 30°C and 100rpm for 15 minutes.

[0060] (2) The solid powder obtained by rotary steaming in step (1) is placed in a porcelain boat, and pyrolyzed in a tube furnace. In an argon atmosphere, the temperature was raised to 500 °C at a heating rate of 5 °C / min and kept for 2 h, and then naturally cooled to room temperature to obtain a ruthenium metal catalyst Ru-C supported ...

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Abstract

The invention discloses a monatom and particle synergistic supported metal catalyst as well as a preparation method and application thereof. According to the metal catalyst disclosed by the invention, metal is uniformly loaded on a carrier in a form of coexistence of single atoms and nano-particles. The metal is at least one of Ir, Ru, Rh, Pd, Co and Pt. The pore diameter of the carrier is 0.5-10nm, and the specific surface area is 200-1500m<2>/g. The carrier is any one of mesoporous carbon, a mesoporous molecular sieve and activated carbon. The monatom and particle synergistic supported metal catalyst shows very excellent activity and selectivity in hydrogenation reaction of quinoline, aromatic nitryl, aromatic aldehyde or carbonyl compounds, and the catalytic activity of the monatomic and particle synergistic supported metal catalyst is higher than that of currently reported catalysts under the same or similar reaction conditions; and the catalyst shows a very excellent industrial application prospect. The monatom and particle synergistic supported metal catalyst is prepared by using a simple dipping and high-temperature pyrolysis method, the method is simple, the metal loading capacity is adjustable, and the catalyst has good reproducibility and is suitable for various metals.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a single-atom-particle synergistic supported metal catalyst and its preparation method and application. Background technique [0002] Aromatic amines, aromatic alcohols, tetrahydroquinoline and their derivatives are very important intermediates in the preparation of drugs and organic synthesis, mainly through the hydrogenation of nitrobenzene, aromatic aldehydes or carbonyl compounds, quinoline and their derivatives The reaction is made. In recent years, researchers have reported a series of catalysts for liquid-phase hydrogenation, including non-noble metals and noble metal homogeneous / heterogeneous catalysts. However, the catalysts that have been reported so far have low catalytic activity, poor product selectivity, and relatively low reaction conditions. harsh. However, heterogeneous catalysts are mostly single-site supported catalysts, that is, particle-type catalysts a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/42B01J29/03B01J37/02B01J37/08C07D215/06C07C29/141C07C33/22C07C209/36C07C211/46
CPCB01J23/462B01J23/468B01J23/42B01J29/0325B01J37/0201B01J37/086B01J37/088C07D215/06C07C29/141C07C209/36B01J2229/186C07C33/22C07C211/46
Inventor 宋卫国沈齐凯曹昌燕
Owner INST OF CHEM CHINESE ACAD OF SCI
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