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Highly-dispersed supported catalyst, and preparation method and application thereof

A supported catalyst, high dispersion technology, applied in catalyst activation/preparation, carbon monoxide reaction preparation, carbon monoxide or formate reaction preparation, etc., can solve the problems of low catalyst activity and low dispersion, and achieve high atomic utilization, The effect of high dispersion and important industrial application prospects

Active Publication Date: 2019-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the larger Ru particles in the catalyst and the lower dispersion, the activity of the catalyst is lower (J.Am.Chem.Soc., 2018, 140, 4172)

Method used

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  • Highly-dispersed supported catalyst, and preparation method and application thereof
  • Highly-dispersed supported catalyst, and preparation method and application thereof
  • Highly-dispersed supported catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Weigh 20mg (NH 4 ) 3 RhCl 6 Dissolve in 20mL of water, add 1g of activated carbon, stir for 0.5h, add 300mg of tannic acid, continue to stir for 0.5h, add 1M NaOH solution dropwise until the solution pH=11, continue to react for 2h, filter and wash until the filtrate is neutral, Dry at 70°C for 24h. After drying, the powder was placed in H at a flow rate of 50 mL / min. 2 / Ar (volume ratio 1:5) mixed atmosphere, and reduced at 160°C for 1 h to obtain a highly dispersed supported catalyst.

Embodiment 2

[0056] Weigh 20mg RhCl 3 ·3H 2 Dissolve O in 20mL of water, add 1g of activated carbon, stir for 0.5h, add 300mg of tannic acid, continue stirring for 0.5h, add 1M NaOH solution dropwise until the solution pH=10, continue to react for 2h, filter and wash until the filtrate is neutral , and dried at 70°C for 24h. After drying, the powder was placed in H at a flow rate of 50 mL / min. 2 / Ar (volume ratio 1:5) mixed atmosphere, and reduced at 160°C for 1 h to obtain a highly dispersed supported catalyst.

[0057] Such as figure 1 As shown, the rhodium atoms in the highly dispersed supported catalyst of this embodiment exist in the form of single atoms.

Embodiment 3

[0059] Weigh 50mg RhCl 3 ·3H 2 Dissolve O in 20mL of water, add 1g of activated carbon, stir for 0.5h, add 300mg of tannic acid, continue stirring for 0.5h, add 1M NaOH solution dropwise until the solution pH=9, continue to react for 2h, add 0.1M NaBH dropwise 4 Rh ions were reduced, filtered and washed until the filtrate was neutral, and dried at 70° C. for 24 hours to obtain a highly dispersed supported catalyst.

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Abstract

The invention discloses a preparation method for a highly-dispersed supported catalyst. The preparation method comprises the following steps: adding tannic acid and a carrier into an active metal precursor solution, adjusting a pH value of an obtained solution to 8 to 11, carrying out a reaction for 1 to 3 h, and carrying out filtering, drying and reducing so as to obtain the highly-dispersed supported catalyst. Due to the chelating and stabilizing actions of the tannic acid, the universality of the carrier is high, and an oxide carrier with defects is no longer limited. The above-mentioned method is simple and effective and has easily-available raw materials, low cost and important industrial application prospects. The invention also discloses the highly-dispersed supported catalyst prepared by using the above-mentioned method provided by the invention. The highly-dispersed supported catalyst has high active metal dispersity and high atom utilization rate. The invention also disclosesan application of the highly-dispersed supported catalyst in a hydroformylation reaction of olefin and a hydroesterification reaction of unsaturated hydrocarbon. The highly-dispersed supported catalyst provided by the invention has high catalytic efficiency and good selectivity; and compared with a conventional homogeneous catalyst, the highly-dispersed supported catalyst provided by the invention is easy to be separated from a hydroformylation reaction system and a hydroesterification reaction system, so the cost of recovery is reduced.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a high-dispersion supported catalyst and its preparation method and application. Background technique [0002] The hydroformylation reaction utilizes olefins and synthesis gas (CO and H 2 ) is a process in which raw materials synthesize aldehydes under the action of a catalyst. The product aldehydes of hydroformylation reaction are high value-added fine chemicals, which are widely used in the preparation of chemical products such as perfumes, gasoline additives, resins and surfactants. Since the discovery of the reaction by Professor Otto Roelen in 1938, hydroformylation has become one of the most important chemical reactions in today's industrial applications. [0003] The development of hydroformylation reaction catalysts has gone through four generations. The first two generations are based on the catalytic system of cobalt carbonyl. The biggest problem of this type of cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/46B01J23/63B01J27/24B01J35/00B01J37/00B01J37/16B01J37/18C07C45/50C07C47/02C07C47/228C07C67/38C07C69/24C07C69/612C07C69/54
CPCB01J23/464B01J23/63B01J27/24B01J23/44B01J23/462B01J37/0018B01J37/18B01J37/16C07C45/50C07C67/38B01J35/394C07C47/02C07C47/228C07C69/24C07C69/612C07C69/54
Inventor 王勇巩玉同王哲毛善俊陈佳东李浩然
Owner ZHEJIANG UNIV
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