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Composite catalyst for catalytic combustion and preparation method of composite catalyst

A composite catalyst and catalytic combustion technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of poor combination of noble metal catalysts and supports and uneven loading , The combination of Pt nanoparticles and TiO2 particles is not tight, etc.

Active Publication Date: 2013-04-24
ENN SCI & TECH DEV
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Problems solved by technology

This simple mixed grinding loading method, on the one hand, is unevenly loaded, and is likely to form agglomerates during the grinding process; on the other hand, Pt nanoparticles and TiO 2 The combination of particles is not tight, and Pt nanoparticles are easy to fall off during use
And it is not suitable for the preparation of large area and a large number of catalysts
[0008] It can be seen that the two schemes disclosed in Chinese Patent 201010023117.3 and Chinese Patent 201010023117.3 are to load the noble metal catalyst on the carrier by the conventional impregnation reduction method or adsorption method. The combination of the noble metal catalyst and the carrier is not tight, and it is very easy to use fall off during the process, resulting in deactivation of the catalyst

Method used

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[0052] In the preparation method of the present invention, the "substance capable of forming alumina sol" refers to a substance capable of forming alumina such as pseudo-boehmite into alumina sol through its physical or chemical action. There is no particular limitation on this substance in the present invention, and one example thereof is nitric acid. Moreover, if in the case of nitric acid, the HNO 3 with Al 2 o 3 The range of molar ratio is 1:0.8-1.1, preferably 1:0.85-1.05, more preferably 1:0.9-1.0.

[0053] In one embodiment of the present invention, when the noble metal is platinum, its specific preparation method is as follows:

[0054] (1) preparing an aqueous solution of chloroplatinic acid, adding pseudo-boehmite therein, and the molar ratio of chloroplatinic acid to pseudo-boehmite is in the range of 1: 10-50;

[0055] (2) Add reducing agent and stabilizer to chloroplatinic acid aqueous solution, heat and stir the above-mentioned mixed solution to reflux, the r...

Embodiment 1

[0063] Configure 150 mL of 2 mmol chloroplatinic acid (produced by Sinopharm Group, the same below) aqueous solution, add 1.2 g of pseudo-boehmite (produced by Zibo Nuoda Chemical, the same below), and dissolve 1 g of PVP in 350 ml of methanol solution, and the pseudo-boehmite Add the chloroplatinic acid solution to the PVP / methanol solution, heat to 70°C for 3 hours, add 0.1M nitric acid solution dropwise after cooling until a sol is formed, and then add 5% ammonia solution dropwise to form a gel. The gel was sintered at 500°C for 2 hours to make alumina-wrapped platinum-embedded composite catalyst a.

Embodiment 2

[0065] Prepare 150mL of 4mmol chloroplatinic acid aqueous solution, add 2.4g pseudoboehmite, dissolve 1g PVP in 350ml methanol solution, add pseudoboehmite / chloroplatinic acid solution to PVP / methanol solution, and heat to 70°C for reaction After cooling for 2 hours, 0.1M nitric acid solution was added dropwise until a sol was formed, and then 5% ammonia solution was added dropwise to form a gel. The gel was sintered at 500°C for 2 hours to make alumina-wrapped platinum-embedded composite catalyst b.

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Abstract

The invention provides composite catalyst for catalytic combustion and a preparation method of the composite catalyst. The composite catalyst comprises noble metal as core, and aluminum oxide as shell for wrapping the noble metal or growing on the noble metal; and the mol ratio of the noble metal to the aluminum oxide is 1: (10-50). The aluminum oxide carrier (namely the composite catalyst) wrapping the noble metal nanoparticles has excellent high-temperature resistance, so that the catalytic conversion performance of the noble metal catalyst is improved; and the catalytic conversion efficiency of the composite catalyst can reach high up to 100%.

Description

technical field [0001] The invention relates to a catalyst for high-activity catalytic combustion and a preparation method thereof, in particular to a composite catalyst with a core-shell structure with noble metal as the core and alumina as the shell and a preparation method thereof. Background technique [0002] Catalytic combustion is a combustion method in which combustible substances in harmful gases are decomposed and oxidized at a lower temperature by using an appropriate catalyst, and it represents the most advanced combustion technology today. Combustibles burn under the action of a catalyst. Compared with direct combustion, the catalytic combustion temperature is lower and the combustion is more complete. Catalysts used in catalytic combustion are multi-component substances of noble metals and metal oxides with large specific surfaces. [0003] At present, catalytic combustion technology has been successfully applied in various fields of industry and life. Inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/52B01J23/44
Inventor 甘中学赵伟仵浩丁天朋李晓洁
Owner ENN SCI & TECH DEV
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