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Preparation and application method of immobilization double-tooth Schiff base vanadyl complex catalyst

A Schiff base and catalyst technology, applied in the field of solid-supported heterogeneous catalysts, can solve the problems of difficult separation, poor thermal stability, and inability to be reused, and achieve the effects of improving thermal stability, improving efficiency, and facilitating separation

Inactive Publication Date: 2012-07-18
ZHONGBEI UNIV
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Problems solved by technology

[0003] Purpose of the present invention: In order to solve the shortcomings of existing vanadyl complexes that are generally used as homogeneous phases, such as poor thermal stability, difficult separation, and inability to be reused, to provide (1) a polystyrene crosslinked microsphere Immobilized bidentate Schiff base type vanadyl (IV) complex heterogeneous catalyst; (2) a preparation method of the heterogeneous catalyst; (3) a heterogeneous catalyst prepared by the above method Method for catalytic oxygen oxidation of benzyl alcohol to benzaldehyde

Method used

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Embodiment Construction

[0019] (1) Preparation method of immobilized bidentate Schiff base type vanadyl complex heterogeneous catalyst (immobilized bidentate Schiff base type vanadyl Ⅳ complex heterogeneous catalyst):

[0020] 1. The embodiment of cross-linked polystyrene microspheres AMCPS prepared by amination modification:

[0021] Example 1: In a four-neck flask, add 1g of chlorine balls (14% chlorine mass content) and 50mL of dimethyl sulfoxide, soak to make it fully swell; then add 1g of hexamethylenetetramine and 1.3g of KI, and heat up to 85°C, react at constant temperature for 8 hours, cool, filter with suction, and separate the microspheres; then place the microspheres in a methanol solution containing hydrochloric acid (6mol / L), stir and react at room temperature for 2-3 hours, filter, and use methanol and distilled water Fully wash the microspheres until the washing solution does not contain halide ions (use AgNO 3 solution test); then place the microspheres in dichloromethane, fully swe...

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Abstract

The invention belongs to the technical field of a vanadyl complex catalyst and particularly relates to an immobilization double-tooth Schiff base vanadyl complex catalyst as well as a preparation method and an application method thereof. The preparation method comprises the following steps: firstly, bonding double-tooth Schiff base genin on crosslinked polystyrene microspheres; and then performing the coordinating chelation reaction to the microspheres and vanadyl sulfate to prepare the crosslinked polystyrene microsphere immobilization double-tooth Schiff base vanadyl (IV) complex catalyst. According to the invention, a homogeneous catalyst is changed into a heterogeneous vanadyl (IV) complex catalyst; not only are the activity and the selectivity of the homogeneous catalyst reserved, but also a series of advantages are brought in, for example, the thermal stability of the catalyst is improved, the catalyst is convenient to separate from a reaction medium, and the catalyst is reused;and the efficiency of the catalyzing process is greatly promoted.

Description

technical field [0001] The invention belongs to the technical field of immobilized heterogeneous catalysts, and in particular relates to an immobilized bidentate Schiff base type vanadyl IV complex heterogeneous catalyst, a preparation method of the catalyst and a method for catalyzing molecular oxygen oxidation of benzene Application method in methanol process. Background technique [0002] There is a trace amount of vanadium in the living body. Vanadium is a biologically active element. In the living body, vanadium exists in several metalloenzymes (such as nitrogenase and haloperoxidase, etc.), and is involved in various enzymatic reactions. In the process, such as the halogenation of organic substrates and the immobilization of nitrogen, vanadium plays an active role. In most cases, the active vanadium species is in the form of vanadium oxy complex (VO 2+ ) exists in the form of Vanadyl complexes play a very important role in many fields such as biomedicine and catalys...

Claims

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Application Information

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IPC IPC(8): B01J31/22C07C47/54C07C45/38
Inventor 王蕊欣高保娇李延斌门吉英安富强
Owner ZHONGBEI UNIV
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