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Manganese oxide catalyst used for toluene liquid phase catalytic oxidation, its preparation method and application

A liquid-phase catalysis and manganese oxide technology, applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems of difficult recovery of low-pressure toluene vapor, serious environmental pollution, poor atom economy, etc., and achieve easy separation , low reaction temperature and small particles

Inactive Publication Date: 2006-08-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The feature of this method is that the selectivity is easy to control. The disadvantage is that the operating temperature is high, resulting in energy waste;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: preparation and activity evaluation of catalyst A

[0018] MnCO 3 Put the powder in an air-ventilated quartz tube, put the quartz tube into a tube furnace, then raise the temperature to 120 °C at a rate of 5 °C per minute, stay for 1 hour and then increase to 1400 °C at a rate of 5 °C per minute, and then Calcined for 4 hours, and finally cooled to room temperature to obtain a black solid which is Catalyst A. The determined components are mainly manganese trioxide.

[0019] Put 1.00g of Catalyst A in a 0.5L autoclave, measure 50mL of toluene with a pipette and add it into the autoclave; seal the autoclave, heat the autoclave to 195°C within 60min, and react with oxygen. The pressure was maintained at 1.00 MPa, and the reaction time was 120 minutes. After the reaction was completed, the temperature of the reactor was lowered to room temperature, the lid of the kettle was opened, and the reaction solution was taken out. The catalyst could be filtered and ...

Embodiment 2

[0020] Embodiment 2: the preparation of catalyst B

[0021] MnCO 3 Put the powder in a quartz tube with nitrogen gas, put the quartz tube into a tube furnace, then raise the temperature to 120 °C at a rate of 5 °C per minute, stay for 1 hour, then increase to 500 °C at a rate of 5 °C per minute, and then Calcined for 8 hours, and finally cooled to room temperature to obtain a green solid which is Catalyst B. The main ingredient is manganese monoxide (manganous oxide). Carry out the liquid-phase oxidation reaction of toluene by the reaction condition and reaction method among the embodiment 1, reaction result is listed in Table 1.

Embodiment 3

[0022] Embodiment 3: the preparation of catalyst C

[0023] MnCO 3 The powder is placed in a quartz tube with nitrogen gas, put the quartz tube into a tube furnace, and then raise the temperature to 120°C at a rate of 5°C per minute, stay for 1 hour and then rise to 300°C at a rate of 5°C per minute, and then Calcined for 8 hours, finally aired for 1 hour and then cooled to room temperature, the obtained solid was Catalyst C. The determined catalyst component is mainly trimanganese tetraoxide. Carry out the liquid-phase oxidation reaction of toluene by the reaction condition and reaction method among the embodiment 1, reaction result is listed in Table 1.

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Abstract

The present invention relates to a manganic oxide catalyst for toluene liquid-phase catalytic oxidation to prepare benzoic acid and benzaldehyde, its preparation method and application. The described manganic oxide can be manganese dioxide, manganese sesquioxide, trimanganese tetraoxide and manganese monoxide and other mixed valence manganic oxide, and said catalyst can be prepared by means of thermolysis method, hydropyrolysis process or precipitation process. Said catalyst has higher activity, selectivity and stability.

Description

technical field [0001] The present invention relates to a manganese oxide catalyst. [0002] The present invention also relates to a method for preparing the above-mentioned catalyst. [0003] The invention also relates to the application of the above-mentioned catalyst in the liquid-phase catalytic oxidation reaction of toluene. Background technique [0004] The catalytic oxidation of toluene is an important method for the preparation of benzoic acid and benzaldehyde. The traditional preparation method of benzoic acid is the homogeneous catalytic toluene oxidation method, which is wasteful and difficult to separate. The traditional preparation method of benzaldehyde is the chlorination method, which has serious pollution, poor product quality, and cumbersome process. To prepare these two products, the preparation process of these two products is simple, the cost of raw materials is low, and the environment is friendly. [0005] Benzoic acid is one of the important interm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34C07C51/265C07C47/32C07C63/06
Inventor 徐杰李晓强周利鹏高进王峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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