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Noble metal carrier catalyst, preparing method and applications thereof

A supported catalyst, precious metal technology, applied in metal/metal oxide/metal hydroxide catalysts, organic chemical methods, chemical instruments and methods, etc., can solve problems such as difficulty in ensuring the adsorption of precious metal nanoparticles, and achieve simple preparation, Wide-ranging and universal effects

Inactive Publication Date: 2008-07-30
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using a colloidal solution containing noble metal nanoparticles to prepare a supported catalyst, it is difficult to ensure that all the noble metal nanoparticles are adsorbed on the surface of the support.
Obviously, the above-mentioned preparation methods all have certain deficiencies, therefore, it is imperative to develop novel preparation methods of noble metal supported catalysts

Method used

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  • Noble metal carrier catalyst, preparing method and applications thereof
  • Noble metal carrier catalyst, preparing method and applications thereof
  • Noble metal carrier catalyst, preparing method and applications thereof

Examples

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preparation example Construction

[0035] The preparation method of the noble metal supported catalyst involved in the present invention comprises the following steps:

[0036] (a) preparing a titanium dioxide precursor rich in hydroxyl groups on the surface;

[0037] (b) mixing the titanium dioxide precursor dispersion with the stannous salt solution, stirring for about ten minutes, centrifuging and washing several times, and then dispersing the precursor into water;

[0038] (c) In the case of stirring, add a noble metal soluble salt solution to the above-mentioned titanium dioxide precursor dispersion treated with a stannous salt solution; in order to ensure that the noble metal salt can be completely reduced and improve the loading capacity of the catalyst, add the noble metal salt solution Afterwards, a reducing agent can also be added to the solution system;

[0039] (d) Continue to stir for several hours, centrifuge and wash several times, and dry the precipitate to obtain the desired noble metal-suppor...

Embodiment 1

[0051] Embodiment 1: preparation 15wt% palladium supported catalyst

[0052] Preparation of hydroxyl-rich titanium dioxide precursor (titanium glycolate): 2.7 mL of water and 170 mL of acetone were mixed to obtain solution A. Add 2mL of tetrabutyl titanate into 50mL of ethylene glycol, stir at room temperature for 8h, then pour into the above solution A, continue stirring for 1h, wash the obtained precipitate with ethanol several times and dry it at about 60°C, namely A hydroxyl-rich titanium dioxide precursor (titanium glycolate) is available.

[0053] Preparation of palladium-supported catalyst with loading capacity of 15wt%: disperse 0.1g titanium dioxide precursor into 20mL deionized water, stir for about 10min, then add to 20mL solution containing 0.1g stannous chloride, continue stirring for 10min, centrifuge Separate and wash with deionized water 5 times, and then disperse the washed precipitate into 40 mL of deionized water. While stirring, add 2.5 mL of palladium ch...

Embodiment 2

[0054] Embodiment 2: preparation 3wt% palladium supported catalyst

[0055] Preparation of hydroxyl-rich titanium dioxide precursor (titanium glycolate): The titanium dioxide precursor was prepared according to the same procedure as in Example 1, but tetrabutyl titanate was replaced by tetraethyl titanate.

[0056] Preparation of a palladium-supported catalyst with a loading amount of 3 wt %: According to the same procedure as in Example 1, the amount of palladium chloride solution added was 0.5 mL (0.056 M).

[0057] Similarly, when the add-on of palladium chloride solution is 5mL (0.056M), the palladium supported catalyst that obtains loading is 30wt%

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Abstract

The invention discloses a noble metal supported catalyst and a preparation method and application thereof. The preparation method of the noble metal supported catalyst of the invention comprises the following steps: (a) titanium dioxide precursor dispersed solution with rich hydroxyl group and stannous salt solution are mixed, stirred, washed and dispersed into the water; (b) when stirring, soluble noble metal salt solution is added into the titanium dioxide precursor dispersed solution after being processed by the stannous salt solution, which is stirred, washed and dried, thus obtaining the noble metal supported catalyst. The method of the invention has no high requirements for preparation conditions which can be carried out under room temperature and atmospheric pressure and does not need heat and pressure; meanwhile, the raw materials adopted in the reaction have wide source and lower toxicity with the advantages of simplicity, economy, low energy consumption, convenient operation and convenience on realizing scale production.

Description

technical field [0001] The invention relates to a noble metal supported catalyst and its preparation method and application. Background technique [0002] Catalysis is an important research topic in chemical research, and catalysts include homogeneous catalysts and heterogeneous catalysts. In order to facilitate the separation of catalyzed products and the reuse of catalysts, heterogeneous catalysts are often used in industry; therefore, many homogeneous catalysts are also loaded on suitable carriers to become heterogeneous catalysts for use. [0003] Noble metals (such as gold, silver, platinum, palladium, rhodium, etc.) are widely used in various catalytic reactions, such as catalytic hydrogenation, catalytic oxidation, carbon-carbon linkage, and so on. In order to improve catalytic activity, noble metals are generally dispersed on solid supports in the form of nanoparticles and used as supported catalysts. For noble metal-supported catalysts, in addition to the role of ...

Claims

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Application Information

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IPC IPC(8): B01J23/38B01J21/06C07B37/00C07B35/02
Inventor 钟良枢胡劲松万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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