Method for selective carbohydrate oxidation using supported gold catalysts

A carbohydrate and gold catalyst technology, applied in the preparation of organic compounds, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of increased leaching, decreased catalyst activity, and promoted the growth of gold particles And other issues

Active Publication Date: 2006-08-09
SUDZUCKER AG MANNHEIM OCHSENFURT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon-supported gold catalyst used does have a relatively large disadvantage: on the one hand, the leaching of gold from the catalyst will increase with the decrease of pH; particle growth
Both lead to a decrease in catalyst activity

Method used

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  • Method for selective carbohydrate oxidation using supported gold catalysts
  • Method for selective carbohydrate oxidation using supported gold catalysts
  • Method for selective carbohydrate oxidation using supported gold catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Oxidation of glucose with a gold catalyst

[0108] The following types of catalysts were used in this example:

[0109] A: 1% Au / C138 type (ACA)

[0110] B: 0.95% Au / Al 2 o 3 (ACA)

[0111] C: 0.7% Au / C11 type (ACA)

[0112] D: 1% Au / TiO 2 Type 5 (ACA)

[0113] E: 0.5% Au / TiO 2 Type 102 (ACA)

[0114] F: 0.5% Au / TiO 2 Type 149 (ACA)

[0115] Oxidation of glucose occurs under the following reaction conditions:

[0116] Reaction volume (per batch): 500mL

[0117] Catalyst dosage: 1g / L

[0118] Initial substrate concentration: 100mmol / L

[0119] pH: 11

[0120] Temperature: 40°C

[0121] Pressure: 1bar

[0122] o 2 Air flow: 500mL / min

[0123] Stirring speed: 700rpm

[0124] Table 2 shows the results obtained for the oxidation of glucose with the above-mentioned catalysts.

[0125] Table 2

[0126] nature

A

B

C

D

E

F

Glucose conversion rate (%) *

93

97

88

74

95

...

Embodiment 2

[0134] with Au / TiO 2 Catalyst to oxidize glucose

[0135] The TiO containing 0.5% Au prepared by embodiment 1 2 The supported catalyst (Catalyst G) was chosen for further studies in which the oxidation of glucose was tested under various reaction conditions.

[0136] Unless otherwise specified, the reaction conditions were the same as in Example 1.

[0137] Effect of pH on Oxidized Glucose

[0138] Using 0.5% Au / TiO 2 Table 3 shows the results of the catalyst (catalyst G) oxidizing glucose under different pH conditions.

[0139] table 3

[0140] nature

pH7

pH9

pH11

Glucose conversion rate (%) *

80

100

100

Initial activity (mmol 葡萄糖 / g 金属 min)

194

416

550

Selectivity to gluconic acid (%)

＞99

＞99.5

98

Selectivity to other oxidation products (%) **

＜0.5

0

＜0.5

Selectivity to fructose (%)

0

0

1

[0141] * Conversion rate at t...

Embodiment 3

[0159] In oxidized glucose, Au / TiO 2 Catalyst long-term stability

[0160] Tested by trial and error with 0.5% Au / TiO 2 Long-term stability of the catalyst (catalyst G in Example 1). For this purpose, the oxidation of glucose is carried out throughout the day. In the evening or over the weekend, the catalyst is placed in a reaction solution consisting mainly of an aqueous solution of gluconic acid so that the catalyst can be deposited. On the second day, the supernatant was decanted gently, and the reactor was filled with freshly prepared glucose solution, and then the second oxidation of glucose was carried out. A total of 17 batches of experiments were repeated in this way, and the reaction conditions were pH=9, temperature 40° C., initial concentration of glucose 250 mmol / L (equivalent to about 4.5% glucose / L). Further reaction conditions are as in Example 1. The results of the tests for some selected batches are listed in Table 6.

[0161] Table 6

[0162] ...

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Abstract

The invention relates to a method for the selective oxidation of a carbohydrate in the presence of a gold catalyst comprising gold particles distributed in a nanodispersed manner on a metal oxide support, and to a method for the selective oxidation of an oligosaccharide in the presence of a gold catalyst comprising gold particles distributed in a nanodispersed manner on a carbon or metal oxide support. The invention also relates to aldonic acid oxidation products produced using said method.

Description

technical field [0001] The present invention relates to a method for the selective oxidation of carbohydrates in the presence of a gold catalyst comprising nanodispersed gold particles on a metal oxide support; to a method for the selective oxidation of oligosaccharides in the presence of a gold catalyst Methods, the gold catalyst comprising nano-dispersed gold particles on a carbon or metal oxide support; and aldonic acid oxidation products prepared by these methods. Background technique [0002] In the global cheese production process and whey production industry, approximately 1,200,000 metric tons of lactose waste are generated annually. However, lactose, as the basic carbohydrate component of milk, has little economic importance. One reason for this is the discovery that certain populations are lactose intolerant. People with lactose intolerance cannot utilize lactose, and absorbing lactose will produce lactose intolerance reactions, such as diarrhea. A relatively sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/105C07H7/027C07C51/235B01J23/52
CPCB01J21/18B01J23/52C07C51/235B01J21/063C07C59/105
Inventor 于尔克·柯瓦茨克阿里雷萨·哈吉贝格利乌尔夫·普吕塞海因茨·贝恩特伊雷妮·皮奇
Owner SUDZUCKER AG MANNHEIM OCHSENFURT
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