Heat conduction material-doped vanadium phosphorus oxide catalyst, preparation thereof and application thereof to selective catalytic oxidization synthesis of maleic anhydride with n-butane

A technology of heat-conducting materials and catalysts, applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc., can solve the problems of uneven heating of catalysts, poor catalytic stability and selectivity, etc., to achieve mass production , improve catalytic activity, simple preparation method

Inactive Publication Date: 2019-03-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the technical problems of the vanadium-phosphorus-oxygen catalyst in the prior art in the process of catalyzing the oxidation of n-butane to generate maleic anhydride, the strong exothermic process of the reaction causes the catalyst to be heated unevenly, and the catalytic stability and selectivity are deteriorated. The first method of the present invention The purpose is to provide a thermally conductive material-doped vanadium-phosphorous-oxygen catalyst. Doping the thermally conductive material in the VPO catalyst not only helps to promote the formation of the catalytic active phase, but also enables the catalyst to be heated evenly during the catalysis process, improving catalytic stability. , catalytic selectivity and catalytic activity are greatly improved

Method used

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  • Heat conduction material-doped vanadium phosphorus oxide catalyst, preparation thereof and application thereof to selective catalytic oxidization synthesis of maleic anhydride with n-butane
  • Heat conduction material-doped vanadium phosphorus oxide catalyst, preparation thereof and application thereof to selective catalytic oxidization synthesis of maleic anhydride with n-butane
  • Heat conduction material-doped vanadium phosphorus oxide catalyst, preparation thereof and application thereof to selective catalytic oxidization synthesis of maleic anhydride with n-butane

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Experimental program
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Embodiment 1

[0031] Weigh V 2 o 5 Put 20g in a 500ml flask, add a mixture of 200ml of isobutanol and 50ml of benzyl alcohol, then add 4.4g of SiC, stir and mix evenly, reflux at 136°C for 3 hours, then cool down to below 90°C, and then add dropwise at a constant speed H with a mass fraction of 85% 3 PO 4 15.5ml and stirred, then the temperature was raised to 136°C and reflux continued for 16 hours. Cool to room temperature, filter again, wash with ethanol and suction filter to obtain a sky blue precipitate. Collect and dry overnight in air at 120°C to obtain a catalyst precursor. Then, the obtained catalyst precursor powder was pressed into tablets under a pressure of 20 MPa, crushed, and 20-40 mesh catalyst particles were sieved. Afterwards, the catalyst particles were placed in the reaction atmosphere (C 4 h 10 / O 2 / N 2 =1.4 / 19.5 / 79.1) from room temperature to 430°C at a rate of 2°C / min for in-situ activation for 12 hours to obtain an activated vanadium-phosphorus-oxygen cata...

Embodiment 2

[0034] Weigh V 2 o 5 Put 20g in a 500ml flask, add a mixture of 200ml of isobutanol and 50ml of benzyl alcohol, then add 2.2g of SiC, stir and mix evenly, reflux at 136°C for 3 hours, then cool down to below 90°C, then add dropwise at a constant speed H with a mass fraction of 85% 3 PO 4 15.5ml and stirred, then the temperature was raised to 136°C and reflux continued for 16 hours. Cool to room temperature, filter again, wash with ethanol and suction filter to obtain a sky blue precipitate. Collect and dry overnight in air at 120°C to obtain a catalyst precursor. Then, the obtained catalyst precursor powder was pressed into tablets under a pressure of 20 MPa, crushed, and 20-40 mesh catalyst particles were sieved. The catalyst particles were then placed in a reaction atmosphere (C4H 10 / O 2 / N 2 =1.4 / 19.5 / 79.1) from room temperature to 430°C at a rate of 2°C / min for in-situ activation for 12 hours to obtain an activated vanadium-phosphorus-oxygen catalyst. The main ...

Embodiment 3

[0037] Weigh V 2 o 5 Put 20g in a 500ml flask, add a mixture of 200ml of isobutanol and 50ml of benzyl alcohol, then add 1.1g of SiC, stir and mix evenly, reflux at 136°C for 3 hours, then cool down to below 90°C, and then add dropwise at a constant speed H with a mass fraction of 85% 3 PO 4 15.5ml and stirred, then the temperature was raised to 136°C and reflux continued for 16 hours. Cool to room temperature, filter again, wash with ethanol and suction filter to obtain a sky blue precipitate. Collect and dry overnight in air at 120°C to obtain a catalyst precursor. Then, the obtained catalyst precursor powder was pressed into tablets under a pressure of 20 MPa, crushed, and 20-40 mesh catalyst particles were sieved. The catalyst particles were then placed in a reaction atmosphere (C4H 10 / O 2 / N 2 =1.4 / 19.5 / 79.1) from room temperature to 430°C at a rate of 2°C / min for in-situ activation for 12 hours to obtain an activated vanadium-phosphorus-oxygen catalyst. The m...

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Abstract

The invention discloses a heat conduction material-doped vanadium phosphorus oxide catalyst, preparation thereof and application thereof to selective catalytic oxidization synthesis of maleic anhydride with n-butane. A preparation method of the catalyst comprises the following steps: placing a vanadium source and a heat conduction material into a fatty alcohol/aromatic alcohol mixed solution for performing a reflux reaction, and adding phosphoric acid for further performing the reflux reaction to obtain a catalyst precursor; placing the catalyst precursor in a protection atmosphere or an n-butane/air mixed atmosphere for activating to obtain the heat conduction material-doped vanadium phosphorus oxide catalyst. The heat conduction material-doped vanadium phosphorus oxide catalyst is dopedwith the heat conduction material, so that the generation of a catalytic active phase is facilitated, the catalyst can be heated uniformly in a catalyzing process, and the catalytic stability, selectivity and activity are improved greatly.

Description

technical field [0001] The invention relates to a catalyst, in particular to a heat-conducting material-doped vanadium-phosphorus-oxygen catalyst and a method for preparing the catalyst, and also relates to the application of a heat-conducting material-doped vanadium-phosphorus-oxygen catalyst in the production of maleic anhydride by oxidation of n-butane, which belongs to catalytic technology field. Background technique [0002] Maleic anhydride, also known as maleic anhydride, or maleic anhydride for short, is an economically very important intermediate product of organic chemicals and fine chemicals, and it is also the third largest acid anhydride in acid anhydride products after phthalic anhydride and acetic anhydride. It is widely used in the production of unsaturated polyester resin, γ-butyrolactone, 1,4-butanediol, tetrahydrofuran and many other chemical products. Therefore, the market is extensive and the demand is strong. With the continuous improvement of domesti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/198C07D307/60
CPCB01J27/198C07D307/60
Inventor 谢志勇梁伊丽文博
Owner CENT SOUTH UNIV
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