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Preparation method for metal oxide/platinum nanoparticle composite catalyst

A platinum nanoparticle and composite catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problem of unstable properties of platinum nanoparticles, and achieve Improve cold start performance, reduce operating costs, and enhance the effect of low temperature activity

Active Publication Date: 2015-11-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a method for preparing a metal oxide / platinum nanoparticle composite catalyst, the purpose of which is to improve the stability of platinum nanoparticles, thus solving the problem of platinum nanoparticles in use. Unstable technical issues

Method used

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  • Preparation method for metal oxide/platinum nanoparticle composite catalyst
  • Preparation method for metal oxide/platinum nanoparticle composite catalyst
  • Preparation method for metal oxide/platinum nanoparticle composite catalyst

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0025] Example 1Pt / Co 3 o 4 Preparation of substrate-type catalyst

[0026] (1) The silicon wafer was boiled for 20 minutes in a mixed solution of deionized water, ammonia water, and hydrogen peroxide at a volume ratio of 5:1:1, and then the silicon wafer was dried with high-purity nitrogen gas.

[0027] (2) Put the silicon wafer treated in (1) into the atomic layer deposition equipment; use cobaltocene and ozone to grow cobalt oxide on the surface of the silicon wafer. Pass high-purity oxygen (99.999%) into the ozone generator to generate ozone with a volume concentration of about 11%). The cobalt precursor temperature was maintained at 100 °C during the deposition process. The reaction temperature was 150°C. The carrier gas is still high-purity nitrogen, the cobalt precursor pulse time is 1.6s, the ozone precursor pulse time is 2s, and the nitrogen purge time is 8s. Repeat 25 cycles to form a thin film of cobalt tetraoxide on the silicon wafer.

[0028] (3) put the sam...

Embodiment 2

[0029] Example 2Pt / Al 2 o 3 Preparation of substrate-type catalyst

[0030] Repeat Example 1 with the same steps as described, the difference is that the organometallic salt used in step (2) is trimethylaluminum, and the oxidizing agent is deionized water. The reaction temperature is 180°C, the carrier gas is nitrogen, the precursor pulse time of the two precursors is 0.1s, the nitrogen cleaning time is 8s, and the number of deposition cycles is 9 times to obtain Pt / Al 2 o 3 Substrate-type catalyst, which can be used to catalyze the oxidation reaction of methanol or CO.

Embodiment 3

[0034] Example 3Pt / Co 3 o 4 Preparation of coated catalyst

[0035] In the comparative example, the silicon wafer with the Pt nanocatalyst grown on the surface was placed in an atomic layer deposition device; cobalt oxide was grown on the surface of the platinum nanoparticle using cobaltocene and ozone. Pass high-purity oxygen (99.999%) into the ozone generator to generate ozone with a volume concentration of about 11%). The cobalt precursor temperature was maintained at 100 °C during the deposition process. The reaction temperature was 150°C. The carrier gas is still high-purity nitrogen, the cobalt precursor pulse time is 1.6s, the ozone precursor pulse time is 2s, and the nitrogen purge time is 8s. Repeat 25 cycles to form a thin film of cobalt tetroxide on the platinum nanoparticles to obtain the required Pt / Co 3 o 4 Coated catalyst can be used to catalyze the oxidation reaction of CO.

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Abstract

The present invention discloses a preparation method for a metal oxide / platinum nanoparticle composite catalyst. The method comprises steps of: using an atomic layer deposition method to grow platinum nanocatalyst particles and a metal oxide; by changing the number of atomic layer deposition cycles, depositing an oxide composite layer of a required thickness and nano particles of a required particle size, wherein both the oxide composite and the nano particles are combined to form the composite catalyst. By the method provided by the invention, the metal oxide / platinum nanoparticle composite catalyst can be prepared accurately and metal catalyst particles are anchored so as to increase thermal stability of the platinum catalyst at a high temperature. Besides, an oxide film and metal have a catalytic synergistic effect so that activity of the catalyst can be improved while sintering resistance of the catalyst is improved.

Description

technical field [0001] The invention belongs to the field of preparation of composite nanomaterials, and more specifically relates to a preparation method of a metal oxide / platinum nanoparticle composite catalyst. Background technique [0002] Catalysts have a wide range of applications and significance in the fields of energy, chemical industry, and environmental protection. In the actual use of catalysts, a large part of catalysts use nanoparticles as the active reaction center of the catalyst. This is because nanoparticles generally have high activity and have a large specific surface area for catalytic reactions. [0003] As a catalyst, platinum nanoparticles are mainly used in processes such as ammonia oxidation, reforming of petroleum hydrocarbons, oxidation and hydrogenation of unsaturated compounds, removal of carbon monoxide and nitrogen oxides in gases, and are often used in chemical, petroleum and chemical reaction processes. kind of catalyst. It has the charac...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/89B01J21/04B01J23/42B01J37/02B82Y30/00B01D53/86B01D53/62
CPCY02A50/20
Inventor 陈蓉蔡佳明曹坤单斌文艳伟
Owner HUAZHONG UNIV OF SCI & TECH
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