Glyoxaline ligand metallic catalyst supported on silica-gel and process for synthesizing the same

A metal catalyst and imidazole-loaded technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., can solve difficult industrial applications and conditions Harsh, complex operation and other problems, to achieve the effect of not easy to fall off, reduce usage, and reduce processing costs

Inactive Publication Date: 2008-10-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the catalysts in the prior art need to add hydrogen in the process of degrading halogen-containing organic substances in water,

Method used

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  • Glyoxaline ligand metallic catalyst supported on silica-gel and process for synthesizing the same
  • Glyoxaline ligand metallic catalyst supported on silica-gel and process for synthesizing the same
  • Glyoxaline ligand metallic catalyst supported on silica-gel and process for synthesizing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a. Silica gel activation: take 200 mesh column chromatography silica gel and put it in an oven, and bake it at 150°C for 10 hours to obtain activated silica gel. The elemental analysis results are shown in Table 1; the infrared analysis results are as follows:

[0028] IR(KBr) v: 3444.15, 1708.72, 1632.94, 1099.11, 970.78, 800.72, 469.21cm -1 .

[0029] b. Synthesis of silica gel-supported γ-chloropropyltrimethoxysilane (coupling agent): get 35g of activated silica gel and add it to 120ml of anhydrous xylene solution, then add 37ml of γ-chloropropyltrimethoxysilane, Heated and refluxed in an oil bath at 140°C for 72 hours. After the reaction, the mixture was filtered, washed with absolute ethanol, dried naturally, and vacuum-dried at 100°C to connect silica gel and imidazole together to obtain the structural formula ( 2) The light yellow-brown product ① shown is 42g. Yield 60.56%.

[0030] The elemental analysis results are shown in Table 1.

[0031] Table 1. Elemen...

Embodiment 2

[0048] Change the silica gel activation temperature in step a. in Example 1 to 160°C, and replace the imidazole in step c with 4,5-dimethyl-substituted imidazole. The yield of the product synthesized in this step is 92.5%, and the acetic acid added in step e 2g, other synthesis steps are the same as in Example 1. The palladium content of the final product was analyzed to be 3.50%.

Embodiment 3

[0050]Change the silica gel activation temperature of step a. in Example 1 to 170°C, change the palladium salt of step e into nickel salt nickel dichloride, the addition amount is 2g, potassium hydride 0.625g is used for alkaline substances, and cyclohexane is selected as the organic solvent alkane, refluxed at 80°C for 6 hours, and other synthesis steps were the same as in Example 1, and the nickel content of the final product was analyzed to be 3.60%.

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Abstract

The present invention discloses a silica solid-carrying imidazole ligand metal catalyst with a structural formula on the right; wherein, the group on the left is a silica solid-carrying agent, R is selected from H atom and methyl; R' is selected from phenmethyl and aryl; M is selected from metal palladium or nickel. The catalyst uses imidazole carbine and transition metals to form a ligand compound. The catalyst can be used for degradation and dehalogenation of the organic halides in water; the reaction conditions of the catalyst are gentle and no secondary pollution is generated. The present invention provides an effective method for the treatment of waste water with organic halides included. The present invention also applies for a synthesizing method for the catalyst provided by the present invention.

Description

Technical field: [0001] The invention belongs to a silica gel immobilized imidazole ligand metal catalyst and a synthesis method thereof. Background technique: [0002] Organic halides are important chemicals widely used in the chemical industry, and are toxic substances that endanger human health. They are often contained in industrial wastewater and domestic wastewater, causing pollution to water bodies and seriously endangering human health. In order to eliminate the pollution of organic halides in wastewater to the environment and to effectively dehalogenate insoluble organic halides completely in water, the key to the problem is to prepare new catalysts for dehalogenation in aqueous phase. Polymer-supported bimetallic catalysts have been reported to catalyze the dehalogenation of organic halides, but most of the dehalogenation reactions are carried out in the organic phase. If in the water phase, the catalyst loses its activity and is not easy to recover and reuse. Re...

Claims

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Application Information

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IPC IPC(8): B01J31/12B01J23/44B01J23/755C02F1/58
Inventor 李子燕张春敏宁平赵静峰张洪彬张德华张皓东
Owner KUNMING UNIV OF SCI & TECH
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