Method for preparing ultrathin titanium oxide-modified nanoporous Au-based catalyst through atomic layer deposition (ALD) and application of catalyst

A technology of atomic layer deposition and catalyst, which is applied in the direction of molecular sieve catalyst, preparation of organic compounds, physical/chemical process catalyst, etc., can solve the problem of aspect ratio limitation modification, etc., to solve the cumbersome and time-consuming steps, and solve the problem of uneven deposition , Solve the effect of poor shape retention

Active Publication Date: 2019-04-26
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high aspect ratio of nanoporous materials limits their modification by traditional preparation methods.

Method used

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  • Method for preparing ultrathin titanium oxide-modified nanoporous Au-based catalyst through atomic layer deposition (ALD) and application of catalyst
  • Method for preparing ultrathin titanium oxide-modified nanoporous Au-based catalyst through atomic layer deposition (ALD) and application of catalyst
  • Method for preparing ultrathin titanium oxide-modified nanoporous Au-based catalyst through atomic layer deposition (ALD) and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of Nanoporous Gold-Based Catalysts Modified by Titanium Oxide Ultrathin

[0027] S1, put 5mLH 4 AuCl 4 4H 2 O (6 mM) was added to 20 mL of water. Then 500 mg of SBA-15 was slowly added to the solution. The pH value of the solution was adjusted to 9.0 with aqueous ammonia, and finally the mixture was vigorously stirred for 24 h under dark conditions. The mixture was then filtered and washed several times with deionized water to remove residual chloride ions. Finally, the obtained solid was dried at room temperature under vacuum for 24 h, and used as a catalyst precursor.

[0028] S2, place the previous body in H 2 A gold nanoparticle catalyst confined on the inner wall of the silica (SBA-15) with mesoporous channels was obtained by reduction at 200 °C for 2 h in a gas atmosphere, named SBA-15 / Au.

[0029] S3. Weigh 10 mg of the powder sample prepared in step S2, disperse it with an appropriate amount of ethanol, and after ultrasonic dispersi...

Embodiment 2

[0031] Example 2: Preparation of Nanoporous Gold-Based Catalysts Modified by Titanium Oxide Ultrathin

[0032] S1, put 5mLH 4 AuCl 4 4H 2 O (6 mM) was added to 20 mL of water. Then 500 mg of SBA-15 was slowly added to the solution. The pH value of the solution was adjusted to 9.0 with aqueous ammonia, and finally the mixture was vigorously stirred for 24 h under dark conditions. The mixture was then filtered and washed several times with deionized water to remove residual chloride ions. Finally, the obtained solid was dried at room temperature under vacuum for 24 h, and used as a catalyst precursor.

[0033] S2, place the previous body in H 2 A gold nanoparticle catalyst confined on the inner wall of the SBA-15 channel was obtained by reduction at 200 °C for 2 h in a gas atmosphere, named SBA-15 / Au.

[0034] S3. Weigh 10 mg of the powder sample prepared in step S2, disperse it with an appropriate amount of ethanol, and after ultrasonic dispersion, drop the suspension on...

Embodiment 3

[0036] Example 3: Preparation of Nanoporous Gold-Based Catalysts Modified by Titanium Oxide Ultrathin

[0037] S1, put 5mLH 4 AuCl 4 4H 2 O (6 mM) was added to 20 mL of water. Then 500 mg of SBA-15 was slowly added to the solution. The pH value of the solution was adjusted to 9.0 with aqueous ammonia, and finally the mixture was vigorously stirred for 24 h under dark conditions. The mixture was then filtered and washed several times with deionized water to remove residual chloride ions. Finally, the obtained solid was dried at room temperature under vacuum for 24 h, and used as a catalyst precursor.

[0038] S2, place the previous body in H 2 A gold nanoparticle catalyst confined on the inner wall of the SBA-15 channel was obtained by reduction at 200 °C for 2 h in a gas atmosphere, named SBA-15 / Au.

[0039] S3. Weigh 10 mg of the powder sample prepared in step S2, disperse it with an appropriate amount of ethanol, and after ultrasonic dispersion, drop the suspension onto...

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Abstract

The invention provides a method for preparing an ultrathin titanium oxide-modified nanoporous Au-based catalyst through atomic layer deposition (ALD) and application of the catalyst and belongs to thetechnical fields of preparation methods and application of catalysts. The method comprises the steps of taking silicon oxide with mesoporous channels (SBA-15) as a carrier, depositing Au nanoparticles into the SBA-15 by using a traditional deposition-precipitation method and modifying ultrathin titanium oxide to surfaces of the Au nanoparticles by using an ALD method. The method provided by the invention has the benefits that the catalytic performance of the prepared nanoporous catalyst is greatly improved through simple one-step ALD ultra-thin oxide modification; and the method can be further applied to the performance improvement of other industrialized nanoporous catalysts.

Description

technical field [0001] The invention relates to a preparation method and application of a catalyst, which is a method for performing atomic layer deposition titanium oxide ultrathin modification on a nanoporous gold-based catalyst to improve the performance of the nanoporous catalyst, and the application of the catalyst in styrene oxidation reaction. Background technique [0002] Nanoporous materials are widely used in the field of industrial catalysis due to their superior properties. Nanoporous materials have a large pore volume, which can promote mass transfer of reactants or products; large specific surface provides more accessible active sites; confined pores prevent the aggregation and shedding of metal particles to enhance catalytic stability. A series of metal nanoparticles have been successfully coated into the pores of nanoporous materials. For example, the typical mesoporous material SBA-15 can encapsulate highly dispersed and small-sized Au nanoparticles in its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/04B01J35/10C07C47/54C07C45/36
CPCB01J29/043B01J35/10C07C45/36C07C47/54
Inventor 王眉花吴瑞瑞侯洁
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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