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Supported noble metal catalyst

A precious metal catalyst, supported technology, used in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc. distribution, etc.

Active Publication Date: 2013-07-31
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The separate addition of mineral acid to the reaction medium has the disadvantage of possible measurement problems
In addition, an uneven distribution of the acid in the reaction medium may occur, therefore, a homogeneous reaction cannot always be guaranteed

Method used

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  • Supported noble metal catalyst
  • Supported noble metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Unreduced palladium on activated carbon according to the invention

[0048] Preparation of Chloro-Hydroxy-Palladium Colloidal Solution

[0049]A solution comprising 500 ml of deionized water and 5.00 g of palladium as palladium(II) chloride was mixed with 45 ml of a 10% strength sodium hydroxide solution at room temperature while stirring. The solution was further stirred for 30 minutes. Determine the pH to be 6.0.

[0050] Immobilization of Chloro-Hydroxy-Palladium Colloids to Activated Carbon Supports

[0051] The formed chloro-hydroxy-palladium colloids were precipitated on the support by adding this solution to a suspension of 95.0 g of commercial activated carbon in 500 ml of deionized water. The suspension was subsequently heated to 80°C. The suspension was then hot filtered and subsequently washed with 1000 ml of deionized water.

[0052] The palladium content of the unreduced catalyst obtained in this way was 5.0%. It has a pH of 3.7. After reduction ...

Embodiment 2

[0054] Reduced palladium on activated carbon catalyst (comparison)

[0055] Reduced 5% palladium on activated carbon catalyst was prepared by a method based on US Patent 3,804,779 (Kent and Evans 1974).

[0056] At room temperature, while stirring, a solution comprising 500 ml of deionized water and 5.00 g of palladium as palladium(II) chloride was mixed with 50 ml of a 10% strength sodium carbonate solution and stirred for a further 2 hours. At the end of stirring, the pH has been determined to be 5.85.

[0057] This solution was then introduced into a suspension of 95 g of activated carbon in 500 ml of deionized water. The hydrolysis was completed by heating to 80°C. The catalyst was reduced using formaldehyde. The suspension was hot filtered and the solid was washed with 1000 ml of deionized water.

[0058] The palladium content of the reduced catalyst obtained in this way was 5.0%.

Embodiment 3

[0060] Unreduced palladium on activated carbon catalyst (comparison)

[0061] Preparation was carried out by a method similar to Example 2, except that the catalyst was processed without pre-reduction of the catalyst. This resulted in an unreduced catalyst with a palladium content of 5.0%.

[0062] The pH of the catalyst was 5.0. After reduction with hydrogen, the pH was 3.6.

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Abstract

A supported noble metal catalyst comprising palladium salts enveloped by colloids applied to the support is produced by hydrolysing a palladium salt solution by means of a base and applying the colloidal suspension to a support. The catalyst can be used in hydrogenations.

Description

technical field [0001] The invention relates to a supported noble metal catalyst, its preparation method and its application. Background technique [0002] Catalysts are used in chemical processes to increase the rate of reactions. Catalysts lower the activation energy, thus speeding up the reaction. [0003] For various reactions it is known to add additional auxiliaries to achieve an additional increase in activity. The type of adjuvant depends on the specific reaction. Thus, for example, it is known to add acids to the reaction medium of hydrogenation reactions in order to increase selectivity and activity. [0004] This is known, for example, for the debenzylation of dibenzyl ethers and benzylamines to amines or the selective hydrogenation of organic nitriles to amines. [0005] The debenzylation of dibenzyl ether proceeds very slowly or is completely inhibited under neutral to alkaline conditions (H. Sajiki, Tetrahedron Letters 36, 1995, 3465). Adding acid can spee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44
CPCB01J37/0211B01J21/18B01J23/44B01J35/0013B01J37/031B01J37/18B01J13/02Y10S977/742B01J35/23
Inventor K·默布斯T·邓恩B·陈
Owner EVONIK OPERATIONS GMBH