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Supported gold catalyst

A gold catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as unsuitable active gold catalyst

Active Publication Date: 2008-08-06
SUDZUCKER AG MANNHEIM OCHSENFURT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the literature, this impregnation method is considered unsuitable for the synthesis of active gold catalysts

Method used

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  • Supported gold catalyst
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: the preparation of catalyst

[0050] carrier material

[0051] As support materials, for example, aluminum oxides Puralox KR-90 and Puralox SCFa-90, a special form doped with NaO (both Sasol companies) are used. They have the following parameters:

[0052] Table 1

[0053] Puralox SCFa-90, doped with NaO

Puralox KR-90

Phase

γ / δ phase

δ / τ phase

Specific surface area (BET-Oberflche)

90-100m 2 / g

90m 2 / g

Particle distribution: <25μm

26.3％

26.8％

<45μm

55.8％

54.0％

<90μm

99.7％

95.6％

Pore ​​volume:

About 0.5ml / g

About 0.8ml / g

Bulk density (Schüttdichte):

0.6g / ml

0.3g / ml

Na content:

0.25-0.3％

0.03％

[0054] Preparation of chloroauric acid precursor

[0055] The necessary amount of tetrachloroauric acid in crystalline form (Chempur (50% Au)) was dissolved in a maximum amount of solvent corresponding to the pore ...

Embodiment 2

[0075] Example 2: Catalytic Oxidation of Glucose

[0076] The catalytic performance of the catalyst prepared according to Example 1 was tested by oxidizing glucose to gluconic acid in the liquid phase.

[0077] The reaction was allowed to take place at 40°C in a tempered glass reactor (volume 500ml). Gas dispersion was performed through a sintered glass filter at an oxygen flow rate of 500 ml / min. The initial glucose concentration was 100mmol / L. The pH value was kept constant at pH 9 with the help of a titrator (Titrolinealpha, Schott Company) and 2 mol / L potassium hydroxide solution. Since gluconic acid is a monocarboxylic acid, under 100% selectivity conditions, the amount of acid obtained is directly derived from the amount of hydroxide solution used. In addition, it was checked by high performance liquid chromatography (HPLC).

[0078] result

[0079] a) Optional

[0080] In this reaction, the as-prepared gold catalyst showed 100% selectivity towards the aldehyde p...

Embodiment 3

[0086] Example 3: Effect of Accelerator

[0087] As promoters, various alkali, alkaline earth and rare earth metals were used and their influence on the activity of the gold catalyst prepared according to Example 1 was examined.

[0088] For comparison purposes, Puralox SCFa-90 ("undoped" in Figure 4) and Puralox SCFa-90 doped with NaO ("Sasol doped" in Figure 4) were used.

[0089] result

[0090] Figure 4 shows the effect of different promoters on the maximum specific activity of a gold catalyst produced according to the invention with 0.3% gold by weight. In each case, the promoter concentration was 0.1% by weight of the overall catalyst. Almost every accelerator added produced an activity-increasing effect. Sodium, potassium, cesium, calcium and cerium oxide (Ceroxide), and samarium oxide (Sm 2 o 3 ), produced the greatest activity-increasing effect.

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Abstract

The invention relates to methods for producing supported gold catalysts from a porous metal oxide support and a chloroauric acid precursor, whereby the support is brought in contact with an aqueous solution of the chloroauric acid precursor. The invention also relates to a metal oxide-supported gold catalyst and to its use for oxidizing alcohols, aldehydes, polyhydroxy compounds and carbohydrates.

Description

field of invention [0001] The present invention relates to a process for the preparation of a supported gold catalyst (Metalloxid-getrgerten Goldkatalysator) from a porous metal oxide support and a chloroauric acid precursor (Chlorogolds®ure-Precursor), wherein the support is contacted with an aqueous solution of the chloroauric acid precursor place. The invention also relates to metal oxide supported gold catalysts and their use in the oxidation of alcohols, aldehydes, polyols and carbohydrates. Background of the invention [0002] There is often a need for highly active and stable catalysts which can be used, inter alia, for the oxidation of organic compounds such as alcohols, aldehydes, polyols and mono-, oligo- and polysaccharides. [0003] The use of supported palladium and platinum catalysts in the oxidation of glucose is well known. However, this is severely limited due to low selectivity and low conversion. Furthermore, the catalyst deactivates relatively quickly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/66C07C51/235B01J37/02B01J35/10
CPCB01J37/0213B01J23/52B01J23/66B01J35/002B01J35/006Y02P20/584B01J35/393B01J35/30B01J37/02C07C51/235
Inventor 阿里礼萨·哈吉贝格利克里斯蒂娜·巴茨纳迪娜·德克尔乌尔夫·普鲁泽克劳斯-迪特尔·沃尔洛普
Owner SUDZUCKER AG MANNHEIM OCHSENFURT