CN114700076A - Vanadium-silver-cerium catalyst for preparing benzaldehyde through toluene gas phase oxidation, preparation method and application thereof - Google Patents

Vanadium-silver-cerium catalyst for preparing benzaldehyde through toluene gas phase oxidation, preparation method and application thereof Download PDF

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CN114700076A
CN114700076A CN202210388303.XA CN202210388303A CN114700076A CN 114700076 A CN114700076 A CN 114700076A CN 202210388303 A CN202210388303 A CN 202210388303A CN 114700076 A CN114700076 A CN 114700076A
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vanadium
silver
toluene
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包明
赵孟迪
王加升
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Dalian University of Technology
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    • B01J23/682—Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with vanadium, niobium, tantalum or polonium
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    • C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
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    • C07C45/34—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties in unsaturated compounds
    • C07C45/36—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of CHx-moieties in unsaturated compounds in compounds containing six-membered aromatic rings
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Abstract

The invention provides a vanadium-silver-cerium catalyst for preparing benzaldehyde by toluene gas phase oxidation, a preparation method and application thereof, and belongs to the technical field of nano catalysis. First, tetrabutyl titanate [ Ti (OC) ]4H9)4]The titanium dioxide sol is used as a precursor, absolute ethyl alcohol is used as a solvent, and glacial acetic acid is used as a chelating agent to prepare the titanium dioxide sol which is used as a carrier. And secondly, dissolving a vanadium source, a silver source and a cerium source to obtain a precursor solution. Finally, placing titanium dioxide powder into the precursor solution, stirring for reaction, centrifuging, washing, drying and calcining to obtain the metal oxide catalyst. In the process of preparing benzaldehyde by gas phase oxidation of toluene, the invention has the advantages of high catalytic activity, toluene conversion rate of more than 20 percent, benzaldehyde selectivity of more than 90 percent, simple catalyst preparation process and stripThe workpiece is mild, and the stability is high; the benzaldehyde is prepared by adopting a toluene gas-phase oxidation method, so that continuous automatic production is easy, and the reaction process is pollution-free; low cost and suitability for large-scale industrial production.

Description

Vanadium-silver-cerium catalyst for preparing benzaldehyde through toluene gas phase oxidation, preparation method and application thereof
Technical Field
The invention belongs to the technical field of nano catalysis, and particularly relates to a preparation method of a vanadium-silver-cerium composite metal oxide catalyst and an application of the vanadium-silver-cerium composite metal oxide catalyst in preparation of benzaldehyde through toluene gas phase oxidation.
Background
The toluene gas-phase oxidation method has the advantages of simple process, low cost, wide raw material source and easiness in automatic continuous production, is a green chlorine-free process for producing benzaldehyde, has a development prospect, and has the defects of low conversion rate and low benzaldehyde selectivity, so that the search for an efficient catalyst is the key for preparing benzaldehyde through toluene gas-phase oxidation.
Catalysts for preparing benzaldehyde by toluene gas phase oxidation are mainly divided into V series, Mo series, Mn series and the like, wherein the V series catalysts are most concerned, and V-Ag in the V series catalysts is reported more, but most of the V series catalysts can only ensure higher conversion rate and selectivity, and can not realize win-win situation, for example, V prepared by the patent CN 1634657aAgbMcOdThe catalyst (wherein M is Ni, Mn and Zr), wherein the highest toluene conversion rate obtained by the V-Ag-Ni catalyst is 8.1%, the benzaldehyde selectivity is 94.4%, the highest toluene conversion rate obtained by the V-Ag-Mn catalyst is 8.2%, the benzaldehyde selectivity is 91.5%, the highest toluene conversion rate obtained by the V-Ag-Zr catalyst is 10.8%, and the benzaldehyde selectivity is 72.6%. Patent CN 1944362 at V/TiO2When the catalyst is used for carrying out gas phase oxidation reaction on toluene, the conversion rate of the toluene is 16.5%, the selectivity of benzaldehyde is 12.5%, the conversion rate of the toluene and the selectivity of the benzaldehyde after the Ag element is doped are improved to a certain extent, the conversion rate of the toluene reaches 26.6%, the selectivity of the benzaldehyde reaches 33.1%, the conversion rate of the toluene is higher, and the selectivity of the benzaldehyde is lower. Therefore, it is difficult to ensure the conversion rate and the selectivity simultaneously in the prior art.
At present, a V-series catalyst is used for carrying out gas phase oxidation on toluene to prepare benzaldehyde, but the conversion rate of toluene and the selectivity of benzaldehyde in a catalytic result cannot be considered at the same time, and based on the contents, the patent aims to design and prepare the catalyst which can realize win-win effect on the conversion rate of toluene and the selectivity of benzaldehyde.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a preparation method and application of a vanadium-silver-cerium catalyst for preparing benzaldehyde by toluene gas-phase oxidation.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a vanadium-silver-cerium catalyst for preparing benzaldehyde by toluene gas phase oxidation comprises the following steps:
(1) preparation of the support
With tetrabutyl titanate [ Ti (OC)4H9)4]As a precursor, absolute ethyl alcohol (C)2H5OH) as solvent, glacial acetic acid (CH)5COOH) as a chelating agent, to prepare a titanium dioxide sol. The method specifically comprises the following steps:
firstly, slowly dripping tetrabutyl titanate into absolute ethyl alcohol at room temperature, stirring in a magnetic stirrer for 10-25 min, uniformly mixing to form a yellow clear solution A, and transferring the yellow clear solution A into a constant-pressure dropping funnel. Wherein, 5-20 mL of tetrabutyl titanate is correspondingly added into every 20-65 mL of absolute ethyl alcohol.
And secondly, adding glacial acetic acid and distilled water into absolute ethyl alcohol, stirring vigorously to obtain a solution B, dripping 1-4 drops of hydrochloric acid, and adjusting the pH value to enable the pH value to be less than 3. Wherein, 2-8 mL of glacial acetic acid and 5-20 mL of distilled water are correspondingly added into every 20-65 mL of absolute ethyl alcohol.
Finally, the solution A was slowly dropped into the solution B with stirring in a room temperature water bath at a dropping rate of about 3 mL/min. And (3) obtaining a light yellow solution after the dropwise addition is finished, continuously stirring for 0.4-0.8 h, and heating to 30-60 ℃ for 1.5-3 h to obtain white gel. And (3) drying the white gel at 70-100 ℃ for 12-21 h to obtain yellow crystals, and grinding to obtain light yellow powder. Calcining for 3-6 h (the heating rate is 2 DEG/min) at 400-550 ℃ to obtain pure white titanium dioxide powder. Wherein the solution A is mixed withThe volume ratio of the solution B is 25: 93-85: 27. The reaction process of each substance in the step is as follows: tetrabutyl titanate can generate hydrolysis reaction in ethanol water solution to generate TiO (OH)2The hydrolysis rate of tetrabutyl titanate can be slowed by adjusting the pH of the solution by adding glacial acetic acid and hydrochloric acid, thereby forming a more stable gel.
(2) Preparation of precursor solution of catalytic element
Dissolving 0.01-0.04 mol of vanadium source (comprising vanadium pentoxide and ammonium metavanadate), 0.02-0.08 mol of oxalic acid, 0.0025-0.02 mol of silver source (silver nitrate) and 0.0025-0.02 mol of cerium source (cerium nitrate hexahydrate) in 15-60 mL of distilled water to prepare a precursor solution with V: Ag: Ce being 2-4: 1: 1.
(3) Impregnation
Placing the titanium dioxide powder prepared in the step (1) into the precursor solution prepared in the step (2), stirring and reacting (in the reaction process, V element, Ag element and Ce element react with each other to form vanadium-cerium compound and vanadium-silver compound, and the vanadium-cerium compound and the vanadium-silver compound are loaded on TiO2On a carrier) and then subjected to a series of operations of centrifugation, washing, drying and calcination to obtain the metal oxide catalyst. Wherein, 1-4 g of titanium dioxide powder is correspondingly added into every 15-60 mL of the precursor solution; the reaction temperature is 70-100 ℃, and the reaction time is 4-7 h; the drying temperature is 80-110 ℃, and the drying time is 10-16 h; the calcining temperature is 400-550 ℃, and the calcining time is 3-6 h.
Vanadium-silver-cerium catalyst (V-Ag-Ce/TiO) obtained by adopting preparation method and used for preparing benzaldehyde by toluene gas phase oxidation2) The active component in the catalyst is CeVO4And AgVO3And the active component is uniformly dispersed in the TiO2On a carrier.
The application of the vanadium-silver-cerium metal oxide catalyst prepared by the method is to prepare benzaldehyde by toluene gas phase oxidation. In the gas phase oxidation reaction of toluene, toluene is firstly adsorbed on an acid site on the surface of a catalyst and then is oxidized by lattice oxygen in the catalyst to obtain benzaldehyde, but if the acidity is too strong, the benzaldehyde is also adsorbed on the toluene to be continuously oxidized, so that the benzaldehyde is continuously oxidizedDeep oxidation to benzoic acid and even CO2Therefore, the acidity of the catalyst cannot be too strong, and the strength of the acid sites on the surface of the catalyst can be reduced by doping Ag into the V-series catalyst, so that the selectivity of benzaldehyde is improved. In the gas phase oxidation of toluene, V-Ag-Ce/TiO2Active component CeVO in catalyst4The lattice oxygen in the catalyst participates in the oxidation of toluene, and the lattice oxygen is converted into oxygen vacancies after the reaction, and the oxygen vacancies can promote the gaseous oxygen in the air to be converted into CeVO again4The lattice oxygen in the catalyst is converted into oxygen vacancies again after continuously participating in the gas phase oxidation reaction of the toluene, and the process is repeated circularly, and more oxygen vacancies are formed after doping Ce, so that the conversion rate of the toluene can be improved. Wherein the process in the toluene gas phase oxidation reaction is as follows: weighing 0.25-1 g of catalyst, placing the catalyst in a reaction tube, wherein the filling mode inside the reaction tube is as follows: quartz wool, quartz sand, catalyst, quartz sand and quartz wool. And after the filling is finished, the reaction tube is filled into the reactor and is connected with a pipeline. In the experimental process, the flow rate of oxidant air (80-200 mL/min) is adjusted, the flow rate of feed toluene (0.25-1 mL/min) is adjusted, and the reaction temperature is adjusted to obtain different reaction results. The lower end of the reactor is connected with a condenser, high-temperature gas obtained by reaction is condensed into liquid and introduced into distilled water, and the product is organic phase insoluble in water and is subjected to liquid separation to obtain the product. The product was detected by gas chromatography using ethylbenzene as the internal standard and ethyl acetate as the solvent.
The beneficial effects of the invention are as follows:
(1) the vanadium-silver-cerium composite oxide catalyst has high catalytic activity, the toluene conversion rate reaches more than 20 percent, the selectivity of the benzaldehyde reaches more than 90 percent, and the catalyst has simple preparation process, mild conditions and high stability in the process of preparing the benzaldehyde by toluene gas phase oxidation.
(2) The invention adopts the toluene gas-phase oxidation method to prepare the benzaldehyde, is easy to realize continuous automatic production and has no pollution in the reaction process. In the reaction process, air is used as an oxidant, so that the cost is low, and the method is suitable for large-scale industrial production.
Drawings
FIG. 1 shows the V-Ag-Ce/TiO prepared in example 22(V:Ag:Ce＝4:2:1)SEM image of catalyst;
FIG. 2 shows the V-Ag-Ce/TiO prepared in example 22TEM image of (V: Ag: Ce ═ 4:2:1) catalyst.
Detailed Description
The present invention will be described in further detail with reference to practical examples, but it should be understood that the present invention is not limited to the specific examples.
Example 1
20mL of tetrabutyl titanate is measured at room temperature, slowly dropped into 65mL of absolute ethyl alcohol, and stirred for 10min by a magnetic stirrer to form a yellow clear solution A. 2mL of glacial acetic acid and 5mL of distilled water were added to another 20mL of anhydrous ethanol, and vigorously stirred to obtain a solution B, 1 drop of hydrochloric acid was added thereto dropwise, and the pH was adjusted to 2.9. Slowly dropping the solution A into the solution B in a room-temperature water bath, continuously stirring for 0.4h, heating in a water bath at 30 ℃ for 3h to obtain white gel. Drying at 70 deg.C for about 21h to obtain yellow crystals, and grinding to obtain light yellow powder. Calcining at 400 ℃ for 6h to obtain pure white titanium dioxide powder.
Placing 15mL of distilled water into a 100mL flask, respectively adding 1.1685g (0.01mol) of ammonium metavanadate, 1.8006g (0.02mol) of anhydrous oxalic acid, 0.4225g (0.0025mol) of silver nitrate and 1.0856g (0.0025mol) of cerium nitrate hexahydrate, stirring at normal temperature for 0.4h to mix uniformly, then weighing 1g of titanium dioxide powder, placing the titanium dioxide powder into the mixed solution, heating to 70 ℃, and continuing to stir for 7 h. Pouring the mixture into a 10mL centrifuge tube, centrifuging at 10000rpm for 10min, pouring the upper liquid phase, putting the lower solid phase into an 80 ℃ oven for drying for 16h to obtain a brown solid, cooling to room temperature, grinding to powder, putting into a tube furnace, heating to 400 ℃ at a heating rate of 2 ℃/min, keeping for 6h, introducing air in the process, and keeping the air rate at 40 mL/min. V-Ag-Ce/TiO in a ratio of V to Ag to Ce of 4 to 12A catalyst.
The prepared V-Ag-Ce/TiO with V, Ag, Ce and 4, 1 and 12The catalyst is used in the toluene gas phase oxidation reaction, the dosage of the catalyst is 0.25g, the toluene feeding amount is 0.28mL/min, the air feeding amount is 80mL/min, the pressure is normal pressure, the reaction temperature is 400 ℃, the toluene conversion rate is 20.20 percent, and the benzylThe aldehyde selectivity was 90.50%.
Example 2
10mL of tetrabutyl titanate is measured at room temperature, slowly dropped into 35mL of absolute ethyl alcohol, and stirred for 15min by a magnetic stirrer to form a yellow clear solution A. 4mL of glacial acetic acid and 10mL of distilled water were added to another 35mL of anhydrous ethanol, and vigorously stirred to obtain a solution B, 2 drops of hydrochloric acid were added dropwise, and the pH was adjusted to 2.8. Slowly dropping the solution A into the solution B in a room-temperature water bath, continuously stirring for 0.5h, heating in a water bath at 40 ℃ for 2.5h to obtain white gel. Drying at 80 deg.C for about 18h to obtain yellow crystals, and grinding to obtain light yellow powder. Calcining at 450 ℃ for 5h to obtain pure white titanium dioxide powder.
Placing 30mL of distilled water in a 100mL flask, adding 2.3369g (0.02mol) of ammonium metavanadate, 3.6012g (0.04mol) of anhydrous oxalic acid, 1.69g (0.01mol) of silver nitrate and 2.1711g (0.005mol) of cerium nitrate hexahydrate respectively, stirring at normal temperature for 0.5h to mix uniformly, then weighing 2g of prepared titanium dioxide powder, placing in the mixed solution, heating to 80 ℃, and continuing stirring for 6 h. Pouring the mixture into a 10mL centrifuge tube, centrifuging at 10000rpm for 10min, pouring the upper liquid phase, putting the lower solid phase into a 90 ℃ oven for drying for 14h to obtain a brown solid, cooling to room temperature, grinding to powder, putting into a tube furnace, heating to 450 ℃ at a heating rate of 2 ℃/min, keeping for 5h, introducing air in the process, and keeping the air rate at 45 mL/min. V-Ag-Ce/TiO with the mass ratio of V to Ag to Ce being 4 to 2 to 12A catalyst. FIG. 1 shows the V-Ag-Ce/TiO prepared in example 22(V: Ag: Ce: 4:2:1) SEM image of 5 μm on the catalyst scale, from which it can be seen that the catalyst prepared by the impregnation method is bulk crystals; FIG. 2 shows the V-Ag-Ce/TiO prepared in example 22(V: Ag: Ce: 4:2:1) TEM image of the catalyst at 100nm, in which a layer of spherical particles with very small particle size is dispersed on the surface of the catalyst.
The prepared V-Ag-Ce/TiO with V, Ag, Ce and 4, 2 and 12The catalyst is used in the toluene gas phase oxidation reaction, the dosage of the catalyst is 0.5g, the toluene feeding amount is 0.35mL/min, the air feeding amount is 150mL/min, the pressure is normal pressure, the reaction temperature is 500 DEG CThe toluene conversion was 27.40% and the benzaldehyde selectivity was 92.19%.
Example 3
15mL of tetrabutyl titanate is measured at room temperature, slowly dropped into 50mL of absolute ethyl alcohol, and stirred for 20min by a magnetic stirrer to form a yellow clear solution A. 6mL of glacial acetic acid and 15mL of distilled water were added to another 50mL of anhydrous ethanol, and vigorously stirred to obtain a solution B, 3 drops of hydrochloric acid were added dropwise, and the pH was adjusted to 2.7. Slowly dropping the solution A into the solution B in a room-temperature water bath, continuously stirring for 0.6h, heating in a water bath at 50 ℃, and obtaining white gel after 2 h. Drying at 90 deg.C for about 15h to obtain yellow crystal, and grinding to obtain light yellow powder. Calcining at 500 deg.C for 4h to obtain pure white titanium dioxide powder.
Putting 45mL of distilled water into a 100mL flask, adding 2.7282g (0.015mol) of vanadium pentoxide, 5.4018g (0.06mol) of anhydrous oxalic acid, 1.268g (0.0075mol) of silver nitrate and 6.534g (0.015mol) of cerium nitrate hexahydrate into the distilled water respectively, stirring the mixture at normal temperature for 0.6h to mix the mixture uniformly, then weighing 3g of prepared titanium dioxide powder, putting the mixture into the mixed solution, heating the mixed solution to 90 ℃, and continuing stirring the mixed solution for 5 h. Pouring the mixture into a 10mL centrifuge tube, centrifuging at 10000rpm for 10min, pouring the upper liquid phase, putting the lower solid phase into a 100 ℃ oven for drying for 12h to obtain a brown solid, cooling to room temperature, grinding to powder, putting into a tube furnace, heating to 500 ℃ at a heating rate of 2 ℃/min, keeping for 4h, introducing air in the process, and keeping the air rate at 50 mL/min. V-Ag-Ce/TiO with the mass ratio of V to Ag to Ce of 4 to 1 to 22A catalyst.
The prepared V-Ag-Ce/TiO of V, Ag, Ce and 4, 1 and 22The catalyst is used in the toluene gas phase oxidation reaction, the using amount of the catalyst is 0.75g, the feeding amount of the toluene is 0.5mL/min, the feeding amount of the air is 175mL/min, the pressure is normal pressure, the reaction temperature is 450 ℃, the toluene conversion rate is 24.16%, and the benzaldehyde selectivity is 91.52%.
Example 4
5mL of tetrabutyl titanate is measured at room temperature, slowly dropped into 20mL of absolute ethyl alcohol, and stirred for 25min by a magnetic stirrer to form a yellow clear solution A. 8mL of glacial acetic acid and 20mL of distilled water were added to another 65mL of anhydrous ethanol, and vigorously stirred to obtain a solution B, 4 drops of hydrochloric acid were added dropwise, and the pH was adjusted to 2.6. Slowly dropping the solution A into the solution B in a room-temperature water bath, continuously stirring for 0.7h, heating in a water bath at 60 ℃, and obtaining white gel after 1.5 h. Drying at 100 deg.C for 12 hr to obtain yellow crystal, and grinding to obtain light yellow powder. Calcining at 550 ℃ for 3h to obtain pure white titanium dioxide powder.
60mL of distilled water was taken and put into a 100mL flask, 4.6738g (0.04mol) of ammonium metavanadate, 7.2024g (0.08mol) of anhydrous oxalic acid, 3.38g (0.02mol) of silver nitrate and 8.684g (0.02mol) of cerium nitrate hexahydrate were added thereto, respectively, and stirred at room temperature for 0.7h to mix them uniformly, then 4g of the prepared titanium dioxide powder was weighed and put into the mixed solution, and stirred for 4h while being warmed to 100 ℃. Pouring the mixture into a 10mL centrifuge tube, centrifuging at 10000rpm for 10min, pouring the upper liquid phase, putting the lower solid phase into a 110 ℃ oven for drying for 10h to obtain a brown solid, cooling to room temperature, grinding to powder, putting into a tube furnace, heating to 550 ℃ at the heating rate of 2 ℃/min, keeping for 3h, introducing air in the process, and keeping the air rate at 55 mL/min. V-Ag-Ce/TiO in a ratio of V to Ag to Ce of 2 to 12A catalyst.
The prepared V-Ag-Ce/TiO with V, Ag, Ce and 2:1:12The catalyst is used in the toluene gas phase oxidation reaction, the catalyst dosage is 1g, the toluene feeding amount is 1mL/min, the air feeding amount is 200mL/min, the pressure is normal pressure, the reaction temperature is 550 ℃, the toluene conversion rate is 25.33%, and the benzaldehyde selectivity is 90.91%.
The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.

Claims (6)

1. A preparation method of a vanadium-silver-cerium catalyst for preparing benzaldehyde by toluene gas phase oxidation is characterized by comprising the following steps:
(1) with titaniumTetra butyl ester of acid [ Ti (OC)4H9)4]Preparing titanium dioxide sol as a carrier by using anhydrous ethanol as a solvent and glacial acetic acid as a chelating agent as a precursor; the method comprises the following specific steps:
1.1) slowly dripping tetrabutyl titanate into absolute ethyl alcohol at room temperature, and stirring and mixing uniformly to form a yellow clear solution A;
1.2) adding glacial acetic acid and distilled water into absolute ethyl alcohol, violently stirring to obtain a solution B, dripping hydrochloric acid, and adjusting the pH value to enable the pH value to be less than 3;
1.3) slowly dripping the solution A into the solution B under room-temperature water bath stirring to obtain a light yellow solution after dripping, continuously stirring for 0.4-0.8 h, and heating to 30-60 ℃ for 1.5-3 h to obtain white gel; drying the white gel at 70-100 ℃ for 12-21 h to obtain yellow crystals, and grinding to obtain light yellow powder; calcining at 400-550 ℃ for 3-6 h to obtain a carrier; wherein the volume ratio of the solution A to the solution B is 25: 93-85: 27
(2) Preparation of precursor solution of catalytic element
Adding a vanadium source, a silver source and a cerium source into distilled water according to the mass ratio of 2-4: 1:1 for dissolving to obtain a precursor solution;
(3) impregnation
Putting the titanium dioxide powder prepared in the step (1) into the precursor solution prepared in the step (2), wherein 1-4 g of titanium dioxide powder is correspondingly added into every 15-60 mL of the precursor solution, stirring and reacting for 4-7 h at 70-100 ℃, and in the reaction process, V element, Ag element and Ce element react with each other to form vanadium-cerium compound and vanadium-silver compound, and the vanadium-cerium compound and the vanadium-silver compound are loaded on the TiO prepared in the step (1)2And (3) carrying out centrifugation, washing, drying and calcining on the carrier to obtain the metal oxide catalyst.
2. The method for preparing the vanadium-silver-cerium catalyst used for preparing benzaldehyde by toluene vapor phase oxidation according to claim 1, wherein 5-20 mL of tetrabutyl titanate is correspondingly added to every 20-65 mL of absolute ethanol in the step 1.1).
3. The method for preparing the vanadium-silver-cerium catalyst used for preparing benzaldehyde by toluene gas-phase oxidation according to claim 1, wherein 2-8 mL of glacial acetic acid and 5-20 mL of distilled water are added into every 20-65 mL of absolute ethanol in the step 1.2).
4. The method for preparing the vanadium-silver-cerium catalyst for preparing benzaldehyde by toluene gas-phase oxidation according to claim 1, wherein the calcination temperature in the step (3) is 400-550 ℃, and the calcination time is 3-6 h.
5. The vanadium-silver-cerium catalyst obtained by the preparation method of any one of claims 1 to 4, wherein the vanadium-silver-cerium catalyst is V-Ag-Ce/TiO2The active component in the composition is CeVO4And AgVO3And the active component is dispersed in the TiO2On a carrier.
6. The use of the vanadium-silver-cerium catalyst for preparing benzaldehyde by vapor-phase oxidation of toluene according to claim 5, wherein the vanadium-silver-cerium catalyst is used for preparing benzaldehyde by vapor-phase oxidation of toluene.
CN202210388303.XA 2022-04-14 2022-04-14 Vanadium-silver-cerium catalyst for preparing benzaldehyde through toluene gas phase oxidation, preparation method and application thereof Withdrawn CN114700076A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
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CH481857A (en) * 1965-11-12 1969-11-30 Stamicarbon Process for the catalytic gas phase oxidation of toluene with oxygen to benzaldehyde
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