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Precious-metal-carried mesoporous composite oxide catalyst and preparation method and application thereof

A technology of composite oxides and noble metals, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, molecular sieve catalysts, etc. and stability limitations, etc., to achieve the effects of easy operation and control, improved CO catalytic performance, high acidity and stability

Inactive Publication Date: 2013-12-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional impregnation method is to impregnate the active component and the carrier with the same volume, so that the active component is dispersed on the carrier, and then it is prepared after calcination. and stability is limited

Method used

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  • Precious-metal-carried mesoporous composite oxide catalyst and preparation method and application thereof
  • Precious-metal-carried mesoporous composite oxide catalyst and preparation method and application thereof
  • Precious-metal-carried mesoporous composite oxide catalyst and preparation method and application thereof

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preparation example Construction

[0028] The invention provides a preparation method of a noble metal supported catalyst and its application in CO catalytic oxidation reaction.

[0029] The supported catalyst is a mesoporous composite oxide doped with noble metal ions (zirconia titanium oxide, ZrO 2 -TiO) material, this noble metal ion is located in the framework of mesoporous zirconia-titanium, for example, compounded on the framework of mesoporous zirconia-titanium by in-situ composite.

[0030] Mesoporous composite oxides (zirconia titanium, ZrO 2 -TiO) has a Zr / Ti ratio of 7:3. In a preferred example, the Zr / Ti ratio is 7:3. Supported mesoporous composite oxides (zirconia-titanium, ZrO 2 -TiO) may have an amorphous structure.

[0031] Catalytically active component noble metals such as Pd are also preferably present in amorphous form.

[0032] In the present invention, the noble metal X accounts for 0.5-1.5 wt% of the total weight of the catalyst. Preferably 1 wt%.

[0033] Preparation method: Novel...

Embodiment 1

[0050] Preparation of catalyst Pd / ZT: Add 5ml of concentrated hydrochloric acid to 10ml of water and stir for 0.5h, then add 0.043~0.128g of PdCl 2 powder, then add 15ml of zirconium n-propoxide (70%) and 5ml of tetrabutyl titanate to hydrochloric acid solution for prehydrolysis for 1 hour; add 5.47g of tetrapropylammonium hydroxide and 3.1g of copper nitrate to 90ml of aqueous solution Stir at room temperature for 2h. Mix the above two solutions together and stir for 2 hours, then put them into a hydrothermal kettle for crystallization at 120°C for 48 hours, dry the crystallized product in an oven at 100°C, and calcinate the obtained powder in a muffle furnace at 400°C for 4 hours , with a heating rate of 1°C min -1 . The resulting material is Pd-loaded mesoporous ZT, denoted as Pd / ZT.

[0051] figure 1 Contains the XRD diffraction spectrum of the catalyst Pd / ZT prepared in this embodiment. Pd / ZT maintains the amorphous structure characteristics of the carrier ZT.

[00...

Embodiment 2

[0056] The difference between this example and Example 1 is that there is no Pd doping, only the catalyst carrier ZT, and other contents are the same as those described in Example 1: 5ml of concentrated hydrochloric acid is added to 10ml of water and stirred for 0.5h, and 15ml of Zirconium n-propoxide (70%) and 5ml tetrabutyl titanate were added to hydrochloric acid solution for prehydrolysis for 1 hour; 5.47g tetrapropylammonium hydroxide and 3.1g copper nitrate were added to 90ml aqueous solution and stirred at room temperature for 2 hours. Mix the above two solutions together and stir for 2 hours, then put them into a hydrothermal kettle for crystallization at 120°C for 48 hours, dry the crystallized product in an oven at 100°C, and calcinate the obtained powder in a muffle furnace at 400°C for 4 hours , with a heating rate of 1°C min -1 . The resulting material is mesoporous ZT, denoted as ZT.

[0057] It has been detected that the catalyst carrier ZT prepared in this ex...

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Abstract

The invention relates to precious-metal-carried mesoporous composite oxide catalyst and a preparation method and application thereof. The catalyst chemically comprises X / ZrO2-TiO2. The ratio of Zr to Ti is 7:3. Precious metals X can be at least one of Ru, Rh, Pd, Pt and Au. The precious metal X (Pd) accounts 0.5-1.5wt% of total weight of the catalyst. The catalyst has the advantages that carrier ZT is large in specific area, high in acidity and stability, and assistive in dispersion of activity centers of precious metals; the modified carrying manner allows the activity centers of precious metals to highly disperse in the carrier in an amorphous pattern, and coordination of the precious metals help improve CO catalysis of the catalyst.

Description

technical field [0001] The invention relates to a preparation method and application of a supported catalyst, belonging to the technical field of catalytic materials. Background technique [0002] CO is one of the main pollutants in the air. At present, the removal of CO is mainly through oxidation and catalysis. Among numerous CO oxidation catalysts, noble metals (Pd, Pt, Rh, Au, etc.) have become common components of CO catalysts and have been extensively studied due to their high activity, good stability, and long life. [0003] Mesoporous materials have large specific surface area, large pore volume and relatively adjustable pore structure, which ensures the uniform dispersion of active centers and makes the transport of reactants in the pores relatively easy. These advantages make it an excellent catalyst or catalytic carrier material. Mesoporous ZrO 2 -TiO 2 As a catalyst, (ZT) composite oxide has a large specific surface area, surface acidity and alkalinity, and h...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J29/03B01D53/86B01D53/62
CPCY02A50/20
Inventor 龚云陈航榕施剑林崔香枝朱颜周晓霞魏晨阳张国彬
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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