Tridentate ligand modified silica gel immobilized platinum-containing hydrosilylation catalyst and preparation method thereof

A platinum catalyst and hydrogen addition technology, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor applicability and low reusability, Achieve the effects of high mechanical strength, low production cost, good chemical stability and thermal stability

Inactive Publication Date: 2021-01-05
SHUNDE POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned catalyst substrates have poor applicability and low reusability

Method used

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  • Tridentate ligand modified silica gel immobilized platinum-containing hydrosilylation catalyst and preparation method thereof
  • Tridentate ligand modified silica gel immobilized platinum-containing hydrosilylation catalyst and preparation method thereof
  • Tridentate ligand modified silica gel immobilized platinum-containing hydrosilylation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1 Preparation of Tridentate Ligand Modified Silica Gel

[0032] Add 300 parts of commercially available silica gel to 5000 parts of absolute ethanol and disperse evenly to obtain a silica gel suspension; then add 30 parts of an organic bidentate ligand to the silica gel suspension, stir and react at 80 °C for 8 h, and the reaction is complete After filtering and washing the solid product with 1000 parts of ethanol, the product was vacuum-dried to obtain a tridentate ligand-modified silica gel;

[0033] Step 2 Preparation of Tridentate Ligand Modified Platinum Catalyst on Silica Gel

[0034] 3 parts of Pt(COD)Cl 2 Dissolve in 100 parts of ethanol, then add the tridentate ligand-modified silica gel prepared in step 1 and disperse evenly, react at 80 °C for 6 h under the protection of normal pressure nitrogen, filter and wash the solid with a solvent after the reaction is complete, and dry it in vacuum. A tridentate ligand-modified silica gel-supported platinum-cont...

Embodiment 2

[0044] Step 1 Preparation of Tridentate Ligand Modified Silica Gel

[0045] Add 100 parts of commercially available silica gel to 5000 parts of absolute ethanol and disperse evenly to obtain a silica gel suspension; then add 30 parts of an organic bidentate ligand to the silica gel suspension, stir and react at 40 °C for 20 h, and the reaction is complete After filtering and washing the solid product with 1000 parts of ethanol, the product was vacuum-dried to obtain a tridentate ligand-modified silica gel;

[0046] Step 2 Preparation of Tridentate Ligand Modified Platinum Catalyst on Silica Gel

[0047]3 parts of Pt(COD)Cl 2 Dissolve in 100 parts of ethanol, then add the tridentate ligand-modified silica gel prepared in step 1 and disperse evenly, react at 40 °C for 18 h under the protection of normal pressure nitrogen, filter and wash the solid with a solvent after the reaction is complete, and dry in vacuo The structure of the tridentate ligand-modified silica gel-supporte...

Embodiment 3

[0051] Step 1 Preparation of Tridentate Ligand Modified Silica Gel

[0052] Add 300 parts of commercially available silica gel to 5000 parts of absolute ethanol and disperse evenly to obtain a silica gel suspension; then add 30 parts of organic bidentate ligands to the silica gel suspension, stir and react at 120 °C for 8 hours, after the reaction is completed Filtrate and wash the solid product with 1000 parts of ethanol, and dry the product in vacuum to obtain a novel tridentate ligand-modified silica gel;

[0053] Step 2 Preparation of Tridentate Ligand Modified Platinum Catalyst on Silica Gel

[0054] 3 parts of Pt(COD)Cl 2 Dissolve in 100 parts of ethanol, then add the tridentate ligand-modified silica gel prepared in step 1 and disperse evenly, react at 120 °C for 4 h under the protection of normal pressure nitrogen, filter and wash the solid with a solvent after the reaction is complete, and dry in vacuum The tridentate ligand-modified silica gel-supported platinum-co...

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Abstract

The invention relates to a tridentate ligand modified silica gel immobilized platinum-containing hydrosilylation catalyst and a preparation method thereof, and is characterized in that a tridentate ligand reacts with surface hydroxylated silica gel to obtain tridentate ligand modified silica gel, and then the tridentate ligand modified silica gel reacts with a platinum-containing compound to obtain the tridentate ligand modified silica gel immobilized platinum-containing hydrosilylation catalyst. The tridentate ligand modified silica gel immobilized platinum-containing catalyst is obtained. The preparation method has the advantages that after modification and immobilization, the chemical stability and the thermodynamic stability are good, and the mechanical strength is high; the used organic tridentate ligand is cheap and easily available, and the overall preparation cost of the catalyst is low; the catalyst can efficiently catalyze an addition reaction of n-octene and triethoxysilane,the conversion rate is greater than 99%, the product selectivity is greater than 95%, and a high-yield beta addition product is obtained. The catalyst can be easily separated from a reaction system in a filtering or centrifuging manner, and can be recycled.

Description

technical field [0001] The invention relates to a platinum-containing hydrosilylation catalyst immobilized on silica gel modified by a tridentate ligand. Background technique [0002] Organosilicon is a class of chemical products with many varieties and excellent performance, and organosilicon chemistry is one of the hot research fields in chemistry at present. The core skeleton of organosilicon compounds generally involves the formation of silicon-carbon bonds, and the most important way is through the hydrosilylation reaction of organosilanes containing active Si-H and unsaturated hydrocarbons containing double bonds. The hydrosilylation reaction requires catalysts to assist the reaction. Among many catalysts, Speier’s and Karstedt’s catalysts are the two most widely used and matured homogeneous platinum catalysts in the research field of organosilicon synthesis and industrial production. [0003] However, the cost of homogeneous platinum catalysts is high due to the diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C07F7/18C07F15/00
CPCB01J31/1815C07F15/0093C07F7/1876B01J2531/828B01J2531/0244B01J2231/323
Inventor 霍应鹏刘锋路风辉陈燕舞张浥琨吴嘉培李玮彭莺彭琦王千一张雅兰
Owner SHUNDE POLYTECHNIC
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