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Preparation method of monoatomic catalyst by taking mesoporous titania as carrier

A mesoporous titanium dioxide and catalyst technology, which is applied in the field of single-atom catalyst preparation, can solve the problems of harsh process, complexity, and incapability of large-scale production, and achieve the effect of simple preparation process, mild reaction conditions and good effect

Inactive Publication Date: 2018-01-12
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the extremely limited preparation methods of single-atom catalysts, large-scale production is not yet possible, and the process is relatively harsh and complicated.

Method used

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  • Preparation method of monoatomic catalyst by taking mesoporous titania as carrier
  • Preparation method of monoatomic catalyst by taking mesoporous titania as carrier
  • Preparation method of monoatomic catalyst by taking mesoporous titania as carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The method for preparing a single-atom catalyst using mesoporous titanium dioxide as a carrier described in this example specifically includes the following steps:

[0021] (1) Dissolve 1.0 g of P123 in 30 g of ethanol solvent, stir at room temperature for 30 minutes to completely dissolve;

[0022] (2) After the P123 is completely dissolved, add 0.55 g of concentrated sulfuric acid (96%) and 1.5 g of concentrated hydrochloric acid (32%) dropwise to the solution, and fully stir to make it evenly mixed;

[0023] (3) Add 3.6 g of isopropyl titanate dropwise to the above solution, and stir at room temperature for 6 hours;

[0024] (4) Add 2ml of chloropalladium acid solution (0.01mol / L) to the above solution, ultrasonically disperse for 30 minutes, then stir at room temperature for 8 hours

[0025] (5) Transfer the above solution to a petri dish, place it in a fume hood and let it stand for 48 hours until the solvent evaporates, then put it in a drying oven and dry it at ...

Embodiment 2

[0029] The method for preparing a single-atom catalyst using mesoporous titanium dioxide as a carrier described in this example specifically includes the following steps:

[0030] (1) Dissolve 1.0 g of P123 in 30 g of ethanol solvent, stir at room temperature for 30 minutes to completely dissolve;

[0031] (2) After the P123 is completely dissolved, add 0.55 g of concentrated sulfuric acid (96%) and 1.5 g of concentrated hydrochloric acid (32%) dropwise to the solution, and fully stir to make it evenly mixed;

[0032] (3) Add isopropyl titanate dropwise to the above solution, and stir at room temperature for 3 hours;

[0033] (4) Add 4ml of chloropalladium acid solution (0.01mol / L) to the above solution, ultrasonically disperse for 30 minutes, then stir at room temperature for 8 hours;

[0034] (5) Transfer the above solution to a petri dish, place it in a fume hood and let it stand until the solvent evaporates, then put it in a drying oven and dry it at 100°C for 24 hours; ...

Embodiment 3

[0038] The method for preparing a single-atom catalyst using mesoporous titanium dioxide as a carrier described in this example specifically includes the following steps:

[0039] (1) Dissolve 2.0g of P123 in 50g of ethanol solvent, stir at room temperature for 30 minutes to completely dissolve;

[0040] (2) After the P123 is completely dissolved, add 1.0 g of concentrated sulfuric acid (96%) and 2.0 g of concentrated nitric acid (67%) dropwise to the solution, and fully stir to make it evenly mixed;

[0041] (3) Add 3.6 g of isopropyl titanate dropwise to the above solution, and stir at room temperature for 6 hours;

[0042] (4) Add 15ml of chloropalladium acid solution (0.01mol / L) to the above solution, ultrasonically disperse for 30 minutes, then stir at room temperature for 8 hours;

[0043] (5) Transfer the above solution to a petri dish, place it in a fume hood and let it stand for 72 hours until the solvent evaporates, then put it in a drying oven and dry it at 100°C f...

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Abstract

The invention provides a preparation method of a monoatomic catalyst by taking mesoporous titania as a carrier. The preparation method comprises the following steps: dissolving polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) into an ethanol solution, after dissolution is ended, respectively adding a certain amount of concentrated sulfuric acid and concentrated hydrochloric acid, stirring at room temperature for a certain time, then adding isopropyl titanate, stirring for a certain time, then adding chloropalladic acid, and preparing a precursor of Pd@TiO2 bySolvent volatilization induced self-assembly technique; drying the precursor, then putting into a muffle furnace, heating to a certain temperature in a program heating way, and keeping the temperature for a period of time; after roasting is ended, reducing at a certain temperature by using an H2 / N2 gas mixture, thus obtaining a palladium monoatomic catalyst with uniform particles. The monoatomiccatalyst prepared by the preparation method has the advantages that the process is simple, metal atoms are dispersed uniformly on the carrier, the repeatability is good, the range of suitable acids iswide, a product is a nanoparticle in a hexagonal prism or sphere shape, therefore the pore size distribution is uniform, the catalytic performance is excellent, and mass production can be realized.

Description

technical field [0001] The invention belongs to the technical field of single-atom catalyst preparation, and in particular relates to a method for preparing a single-atom catalyst with mesoporous titanium dioxide as a carrier. Background technique [0002] In the chemical production process, the development of efficient catalysts is one of the main research contents. Supported metal catalysts are widely used in many important industrial catalytic reactions due to their excellent catalytic properties, such as high activity, high selectivity, or both. Usually, the active centers of supported catalysts are limited to some atoms exposed on the surface, while a large number of bulk atoms cannot contact the reaction molecules, so the size of the active components on the support is closely related to the catalytic performance. In some catalyst preparation processes, in order to avoid the waste of catalyst active components, the metal cluster active components are distributed as ev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J37/08B01J37/16B01J37/34C07C5/03C07C9/00
Inventor 宋红兵刘宗盖恒军肖盟吕志果
Owner QINGDAO UNIV OF SCI & TECH
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