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Mesoporous TiO2 supported V2O5 catalyst with high specific surface area as well as preparation method and use thereof

A high specific surface area, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high reaction temperature, low catalytic activity, selectivity and Problems such as poor catalyst stability, to achieve the effect of high yield and low reaction temperature

Inactive Publication Date: 2009-05-20
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention is aimed at traditional V 2 o 5 / TiO 2 In the process of producing 3-cyanopyridine by the ammoxidation of 3-picoline, the catalytic activity is low, which leads to the disadvantages of high reaction temperature, poor selectivity and poor catalyst stability. It provides a method for the production of 3-picoline ammoxidation Mesoporous V of 3-cyanopyridine 2 o 5 / TiO 2 Catalyst preparation method

Method used

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  • Mesoporous TiO2 supported V2O5 catalyst with high specific surface area as well as preparation method and use thereof

Examples

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Effect test

Embodiment 1

[0016] 1.1% mesoporous V 2 o 5 / TiO 2 Catalyst preparation, characterization and catalytic performance

[0017] 16.0g of tetraethylpropoxytitanium, 0.136g of triisopropoxyvanadyl and 11.0g of decaamine were dissolved in 80g of deionized water at a temperature of 273K, and then the above-mentioned mixing was adjusted with a concentration of 0.1mol / L HCl solution When the pH value of the solution reaches 5, continue to stir for 12 hours, then transfer the above mixed solution to a polytetrafluoro high-pressure hydrothermal kettle, and perform hydrothermal treatment at a temperature of 343K for 3 days, and then repeatedly wash the above-mentioned solid powder with methanol and diethylene ether for 3 time, and dried at a temperature of 373K in an oven for one day, treated at 453K in a vacuum oven for 10 days, then extracted the template agent in the solid powder with p-toluenesulfonic acid, and finally treated the above powder at 373K in an oven Dry for 2 hours and bake at 523K...

Embodiment 2

[0020] 2.5% mesoporous V 2 o 5 / TiO 2 Catalyst preparation, characterization and catalytic performance

[0021] 16.0g of tetraethylpropoxytitanium, 0.310g of triisopropoxyvanadyl and 14.1g of dodecylamine were dissolved in 100g of deionized water at a temperature of 273K, and the above-mentioned When the pH value of the mixed solution reaches 4, continue to stir for 12 hours, then transfer the above mixed solution to a PTFE high-pressure hydrothermal kettle, conduct hydrothermal treatment at a temperature of 353K for 3 days, and then repeatedly wash the above-mentioned solid powder with methanol and diethyl ether 3 times, and dried at 373K in an oven for one day, and treated at 453K in a vacuum oven for 10 days, then extracted the template agent in the solid powder with p-toluenesulfonic acid, and finally treated the above powder at 383K in an oven Drying at low temperature for 2 hours and sintering at 553K in a muffle furnace for 2 hours to obtain 2.5% mesoporous V 2 o 5...

Embodiment 3

[0024] 5.0% mesoporous V 2 o 5 / TiO 2 Catalyst preparation, characterization and catalytic performance

[0025] 16.0g of tetraethylpropoxytitanium, 0.636g of triisopropoxyvanadyl and 16.2g of tetradecylamine were dissolved in 120g of deionized water at a temperature of 273K, and the above-mentioned When the pH value of the mixed solution reaches 3, continue to stir for 12 hours, then transfer the above mixed solution to a PTFE high-pressure hydrothermal kettle, conduct hydrothermal treatment at a temperature of 363K for 3 days, and then repeatedly wash the above-mentioned solid powder with methanol and diethyl ether 3 times, and dried at 373K in an oven for one day, and treated at 453K in a vacuum oven for 10 days, then extracted the template agent in the solid powder with p-toluenesulfonic acid, and finally treated the above powder at 393K in an oven Drying at 573K for 2 hours in a muffle furnace to obtain 5.0% mesoporous V 2 o 5 / TiO 2 catalyst.

[0026] The BET speci...

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Abstract

The invention relates to a mesoporous TiO2 supported V2O5 catalyst with high specific surface area and a preparation method and application thereof. Aiming at the disadvantages that the prior V2O5Tio2 has low catalytic activity, high reaction temperature, and poor selectivity and catalyst stability when 3-methylpyridine is ammoxidized to produce 3-cyanopyridine, the invention provides a mesoporous TiO2 supported V2O5 catalyst which has low reaction temperature, high transformation rate and good selectivity, is used for producing the 3-cyanopyridine by ammoxidizing the 3-methylpyridine and has high specific surface area, and a preparation method and application thereof. The catalyst comprises a carrier and an active constituent, the carrier adopts TiO2, and the active constituent adopts V2O5. The method for preparing the catalyst comprises the following steps: a template agent adopts organic amine, a titanium source adopts tetraisopropoxy titanium, a vanadium source adopts triisopropoxyvanadium oxide, and the TiO2 supported V2O5 catalyst is directly synthesized in a polytetrafluorine kettle under hydrothermal conditions. The catalyst is used for producing the 3-cyanopyridine by ammoxidizing the 3-methylpyridine in a gas phase.

Description

Technical field: [0001] The invention relates to a doped mesoporous metal oxide catalyst and its preparation method and the application of the catalyst in the selective ammoxidation of aromatic hydrocarbons, in particular to a mesoporous TiO with a high specific surface area 2 load V 2 o 5 The preparation method of the catalyst and the application of the catalyst in the ammoxidation of 3-picoline to produce 3-cyanopyridine. technical background: [0002] Nicotinic acid and nicotinamide are vitamin B series drugs, widely used in medicine, daily chemicals, feed additives, plastic stabilizers, electroplating brighteners and antioxidants, and also play an important role in the metabolism of humans and animals. At present, the production process of nicotinic acid is mostly produced by ammoxidation of 3-picoline to produce 3-cyanopyridine, which is then hydrolyzed. Among them, there is a technical problem of low yield of the target product in the ammoxidation process of 3-picoli...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J21/06C07D213/85
Inventor 钟依均张富民方文程陈菲朱伟东
Owner ZHEJIANG NORMAL UNIVERSITY
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