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Vanadium oxide and vanadium argentum oxide capable of producing benzaldehyde and benzoil acid by selectively oxidizing toluol

A technology for vanadium oxides and composite oxides, which is used in the preparation of oxygen-containing compounds by hydrocarbon oxidation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. Unable to apply catalytic reaction and other problems, to achieve the effect of simple preparation method and high surface area

Inactive Publication Date: 2009-01-07
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as Angrew.Chem.Int.Ed. Volume 37 page 1263 (1998) reported the synthesis of vanadium nanotubes, Mater.Res.Bull. Volume 33 page 561 (1998) reported drying with supercritical or low surface tension solvent The method prepares surface areas up to 150-200m 2 / g of vanadium gel, and is used to prepare the electrode of lithium battery, but the obtained material is not resistant to high temperature, and the surface area just drops a lot at 300 ℃, can't be applicable to the catalytic reaction that needs higher reaction temperature; Langmuir volume 18, page 8535 (2002 ) reported the preparation of high surface area mesoporous vanadium and vanadium magnesium materials with a surface area of ​​160m 2 / g
However, the obtained material uses a surfactant, and after roasting in an inert atmosphere, more carbon remains on the surface.
In addition, the above-mentioned preparation processes are relatively complicated, often need to use surfactants, etc., and the reaction time required for the preparation of materials is relatively long, which limits their application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 5gV 2 o 5 Dissolve in 800ml of hydrogen peroxide with a concentration of 10%, heat in a water bath at 80°C for 40 hours to obtain an orange-red colloid, then add 100ml of n-butanol, evaporate to dryness in a water bath at 80°C, dry at 120°C for 10 hours, and vacuum at 400°C Roasting for 1h, black vanadium oxide was obtained, and its surface area was measured to be 180m 2 / g, the pore size is 3-5nm.

Embodiment 2

[0024] 5gV 2 o 5 Dissolve in 500ml of hydrogen peroxide with a concentration of 5%, heat in a water bath at 60°C for 35 hours to obtain an orange-red colloid, then add 300ml of n-butanol, evaporate to dryness in a water bath at 80°C, dry at 120°C for 10 hours, and then in air / toluene =5 / 1 (gas volume ratio) under the atmosphere of 360 ° C for 2 hours, to obtain dark green vanadium oxide, the measured surface area is 120m 2 / g, the pore size is 3-20nm.

Embodiment 3

[0026] Will 5g V 2 o 5 Dissolve in 300ml of 20% hydrogen peroxide, heat in a water bath at 70°C for 15 hours to obtain an orange-red colloid, then add 300ml of n-butanol, evaporate to dryness in a water bath at 80°C, dry at 120°C for 10 hours, and vacuum at 600°C for 1 hour. A black vanadium oxide was obtained with a measured surface area of ​​100 m 2 / g, the pore size is 3-5nm.

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Abstract

The invention discloses a high surface area vanadium-argentum complex oxide catalyst, the general formula of which is AgxVyOz, wherein, x can be 0 or 1: when x is equal to 0, y is equal to 2, and z is equal to 3-5, AgxVyOz is a vanadium oxide; when x is equal to 1, y is equal to 1-6, and z is equal to 2-13, AgxVyOz is a vanadium-argentum complex oxide. The vanadium oxide and the vanadium-argentum complex oxide are prepared by V2O5, AgNO3, H2O2 and n-butyl alcohol. The prepared vanadium oxide and the prepared vanadium-argentum complex oxide have good thermal stability and high surface area, and possess the performances of catalyzing toluene and preparing benzaldehyde and benzoic acid through selective oxidation, and the selectivity of generating benzaldehyde and benzoic acid under the conversion rate of about 10 percent can reach 95 percent, wherein, the selectivity of benzaldehyde is more than 50 percent.

Description

1. Technical field [0001] The invention relates to a high-surface-area vanadium-silver composite oxide catalyst and a preparation method thereof. The catalyst is used for gas-phase selective oxidation of toluene to prepare benzaldehyde and benzoic acid. 2. Background technology [0002] There is a large amount of toluene in the products of petroleum refining, and it is very necessary to process and transform it deeply. An important method is to selectively oxidize toluene, that is, to oxidize the methyl group on its benzene ring to produce products such as benzaldehyde, benzoic acid and benzyl alcohol required by food and medicine. The existing processes for producing benzaldehyde and benzoic acid by selective oxidation of toluene mainly adopt toluene chlorination hydrolysis and toluene liquid phase oxidation. The products obtained by the chlorination and hydrolysis of toluene contain a small amount of chlorine, which is not suitable for some purposes, and because a large a...

Claims

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Application Information

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IPC IPC(8): B01J23/68C07C27/12C07C47/54C07C63/06
Inventor 沈俭一薛明伟戈加震傅玉川
Owner NANJING UNIV