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Hydrotalcite-loaded palladium catalyst for preparing styrene through selective hydrogenation of phenylacetylene and preparation method thereof and application

A technology for selective hydrogenation and styrene production, which is applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. It can solve the problems of cumbersome preparation process and low catalytic performance. Achieve the effects of simple preparation process, high industrial value and simple process

Active Publication Date: 2020-04-24
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the problems of cumbersome preparation process and low catalytic performance of catalysts currently used for selective hydrogenation of phenylacetylene, and provides a simple and convenient synthesis method for a high-efficiency heterogeneous palladium catalyst for selective hydrogenation of phenylacetylene

Method used

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  • Hydrotalcite-loaded palladium catalyst for preparing styrene through selective hydrogenation of phenylacetylene and preparation method thereof and application
  • Hydrotalcite-loaded palladium catalyst for preparing styrene through selective hydrogenation of phenylacetylene and preparation method thereof and application
  • Hydrotalcite-loaded palladium catalyst for preparing styrene through selective hydrogenation of phenylacetylene and preparation method thereof and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A. Preparation of ZnAl hydrotalcite

[0036] The hydrotalcite support was prepared by co-precipitation method, and the molar ratio of Zn / Al was 2:1. Prepare 0.08 mol / L Zn(NO 3 ) 2 and 0.04 mol / L Al(NO 3 ) 3 100 mL of mixed salt solution, and 0.56 mol / L CO(NH 2 ) 2 50 mL of weak base solution. At room temperature, the above mixed salt and weak base solution were slowly added dropwise into a three-neck flask filled with 50 mL of deionized water. After the dropwise addition was completed, after stirring for 1 h, the resulting mixed slurry was transferred to a hydrothermal kettle, and reacted at 140° C. for 48 h. After the kettle was taken out and cooled to room temperature, the precipitate was washed with deionized water until the pH of the supernatant was about 7. The obtained precipitate was dried at 60 °C for 6 h, and the powder sample obtained by grinding was ZnAl-LDH.

[0037] B1. Preparation of 0.35wt% Pd / ZnAl-LDH

[0038] Weigh 1.0 g of the prepared zinc-a...

Embodiment 2

[0058] A. Preparation of NiAl hydrotalcite

[0059] The hydrotalcite carrier was prepared by co-precipitation method, and the molar ratio of Ni / Al was 2 / 1. Prepare 0.08 mol / L Ni(NO 3 ) 2 and 0.04 mol / L Al(NO 3 ) 3 100 mL of mixed salt solution, and 0.56 mol / L CO(NH 2 ) 2 50 mL of weak base solution. At room temperature, into a three-necked flask filled with 50 mL of deionized water, the mixed salt and weak base solution were slowly added dropwise at the same time. After the dropwise addition was completed, after stirring for 1 h, the resulting mixed slurry was transferred to a hydrothermal kettle, and reacted at 130° C. for 48 h. After the kettle was taken out and cooled to room temperature, the precipitate was washed with deionized water until the pH of the supernatant was about 7. After the obtained precipitate was dried at 60 °C for 8 h, the powder sample obtained by grinding was NiAl-LDH.

[0060] B. Preparation of 0.68wt% Pd / NiAl-LDH

[0061] Weigh 1.0 g of the ...

Embodiment 3

[0063] A. Preparation of NiFe hydrotalcite

[0064]The hydrotalcite carrier was prepared by co-precipitation method, and the molar ratio of Ni / Fe was 2 / 1. Prepare 0.08 mol / L Ni(NO 3 ) 2 and 0.04 mol / L Fe(NO 3 ) 3 100 mL of mixed salt solution, and 0.56 mol / L CO(NH 2 ) 2 40mL of weak base solution. At room temperature, into a three-necked flask filled with 50 mL of deionized water, the mixed salt and weak base solution were slowly added dropwise at the same time. After the dropwise addition was completed, after stirring for 1 h, the resulting mixed slurry was transferred to a hydrothermal kettle, and reacted at 140°C for 48 h. After the kettle was taken out and cooled to room temperature, the precipitate was washed with deionized water until the pH of the supernatant was about 7. After the obtained precipitate was dried at 60 °C for 6 h, the powder sample obtained by grinding was NiFe-LDH.

[0065] B. Preparation of 0.73wt% Pd / NiFe-LDH

[0066] Weigh 1.0 g of the prep...

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Abstract

The invention discloses a hydrotalcite-loaded palladium catalyst for preparing styrene through selective hydrogenation of phenylacetylene and a preparation method thereof and application. According tothe catalyst, hydrotalcite is used as a carrier, and palladium is dispersed on the surface of the carrier in a nanoparticle form. The carrier is any one of ZnAl, NiAl, CoAl and NiFe hydrotalcite. Theactive component is palladium, and the mass fraction of palladium is 0.5-1.5%. The preparation method comprises the following steps of: dispersing hydrotalcite in mixed alcohol, adding a noble metalsalt solution, stirring for several hours, centrifuging and drying to obtain the hydrotalcite-loaded palladium nano-catalyst. The preparation method of the catalyst is simple and suitable for large-scale production. The obtained catalyst has extremely high activity and styrene selectivity in a selective hydrogenation reaction of phenylacetylene, and also has good stability and substrate universality.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a hydrotalcite-supported palladium catalyst used for the selective hydrogenation of phenylacetylene to produce styrene, a preparation method and application thereof. Background technique [0002] Styrene (ST) is one of the most important raw materials in chemical industry production, and is an important monomer for the production of polystyrene, styrene-butadiene rubber, ABS resin, SAN resin and styrene-based thermoplastic elastomer (SBS). The main method of industrial production of styrene is the dehydrogenation of ethylbenzene. In the production process, in addition to dehydrogenation of ethylbenzene to styrene, it is also prone to excessive dehydrogenation to phenylacetylene. In addition, the extraction of styrene from the by-product C8 fraction of cracking ethylene is also a new way to increase the production of styrene, but the C8 fraction also contains a smal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60B01J23/89B01J37/16C07B35/02C07C5/09C07C15/46C07C15/52C07C17/354C07C25/28C07C41/20C07C43/215
CPCB01J23/60B01J23/892B01J37/16C07C5/09C07C17/354C07C41/20C07B35/02C07C15/46C07C15/52C07C25/28C07C43/215
Inventor 赵建波袁海丰韩莉锋田宽秦笑梅桂阳海刘应凡孙雨安周立明方少明
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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