CN114272947B - Catalyst for preparing benzaldehyde by oxidation of solvent-free benzyl alcohol, and preparation method and application thereof - Google Patents
Catalyst for preparing benzaldehyde by oxidation of solvent-free benzyl alcohol, and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a catalyst for preparing benzaldehyde by oxidizing solvent-free benzyl alcohol, a preparation method and application thereof, wherein the catalytic performance is regulated and controlled by regulating the calcination temperature and a template agent. The preparation method is simple, the raw materials are cheap, complex equipment is not needed, the process is pollution-free, and the preparation method is suitable for industrialized mass production. The ZnO/g-C 3 N 4 The catalyst can prepare benzaldehyde by photocatalytic oxidation of benzyl alcohol by oxygen under the condition of no solvent, and has high benzaldehyde yield and selectivity, so that the catalyst has wide industrial application prospect.
Description
Technical Field
The invention belongs to the technical field of benzaldehyde preparation, and particularly relates to a catalyst for preparing benzaldehyde by oxidation of solvent-free benzyl alcohol, and a preparation method and application thereof.
Background
As an aromatic aldehyde which is most widely used in industry, the benzaldehyde has important application value in the fields of agriculture, pharmacy, perfume, dye and the like. Many systems for preparing benzaldehyde by catalyzing benzyl alcohol oxidation require acetonitrile, benzotrifluoride, toluene, hexafluoroisopropanol, 1, 4-dioxane and other organic solvents, so that industrial separation of products is difficult, and the reaction cost is increased. It is therefore of great theoretical and practical importance to explore a solvent-free, efficient, environmentally friendly route for the photocatalytic oxidation of benzyl alcohol to benzaldehyde.
Sun Hongmei and the like have invented a method of using water as a solvent to hydrate iron nitrate (Fe (NO) 3 ) 3 ·9H 2 O), 4-hydroxy-2, 6-tetramethylpiperidine oxide (4-OH-TEMPO) and carboxylic acid as catalysts, and oxidizing an alcohol to an aldehyde or ketone with oxygen or air as an oxidant provides a process for preparing an aldehyde or ketone by alcohol oxidation (202110596027.1). Bai Linlu A quaternary ammonium salt surfactant with specific structure is used as structure directing agent through low temperatureSuccessfully prepares the TS-1 molecular sieve nano-sheet by a hydrothermal method. Ni is introduced into the ion exchange position of the TS-1 molecular sieve nano sheet by an ion exchange method 2+ Photocatalytic alcohol oxidation (202010983247.5). The prior art mainly has the problems of high price, incapability of recycling, complex preparation method, serious environmental pollution, low substrate conversion rate and product selectivity and the like, and is not beneficial to industrial practical application.
Disclosure of Invention
The invention provides a photocatalyst ZnO/g-C with excellent catalytic activity for solving the problems existing in the prior art 3 N 4 . The preparation method of the catalyst is simple, the raw materials are cheap, complex equipment is not needed, and the whole preparation process is pollution-free. The method successfully synthesizes ZnO/g-C 3 N 4 The photocatalytic oxidation activity of the catalyst is examined by preparing benzaldehyde by using solvent-free benzyl alcohol for oxidation. By regulating and controlling the precursor and the calcination temperature, the photocatalyst with the best effect is synthesized.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the preparation method of the catalyst for preparing benzaldehyde by oxidation of solvent-free benzyl alcohol comprises the following steps:
a: dissolving a zinc source, a precursor and a template agent in a solvent to obtain a mixed solution;
b: stirring the mixed solution uniformly at room temperature;
c: heating and stirring the solution obtained in the step b, and completely volatilizing the solvent;
d: grinding the mixture obtained in the step c to obtain uniform solid powder;
e: calcining the solid powder obtained in the step d in air and grinding to obtain ZnO/g-C 3 N 4 A catalyst.
Further, the zinc source is anhydrous zinc acetate, the precursor is melamine, the template agent is ammonium chloride, and the solvent is anhydrous ethanol.
Further, the molar ratio of the anhydrous zinc acetate to the melamine to the ammonium chloride to the anhydrous ethanol is 1:20:40:100, the stirring time at room temperature in the step b is 12h, and the stirring time at 90 ℃ in the step c is 12h to completely volatilize the solvent.
Further, the step e specifically includes: placing the solid powder obtained in the step d into a crucible, capping, heating to 500-800 ℃ at a heating rate of 2.5 ℃/min under an air atmosphere, calcining for 5 hours at constant temperature, and naturally cooling to room temperature to obtain yellow ZnO/g-C 3 N 4 Grinding for later use.
A catalyst for preparing benzaldehyde by oxidation of solvent-free benzyl alcohol is prepared by the preparation method.
Application of catalyst for preparing benzaldehyde by solvent-free benzyl alcohol oxidation in preparation of benzaldehyde, znO/g-C is prepared 3 N 4 The catalyst and benzyl alcohol are placed in a photocatalysis reaction vessel, and 0.1g ZnO/g-C is added into 20mmol benzyl alcohol 3 N 4 And (3) introducing 1bar of nitrogen into the catalyst, and under the irradiation of an LED light source with the power of 10W and the wavelength of lambda=400-405 nm, stirring at 1500rpm, reacting at 25 ℃ for 12 hours to obtain the benzaldehyde product.
Application of catalyst for preparing benzaldehyde by solvent-free benzyl alcohol oxidation in preparation of benzaldehyde, znO/g-C is prepared 3 N 4 The catalyst and benzyl alcohol are placed in a photocatalysis reaction vessel, and 0.1g ZnO/g-C is added into 400mmol benzyl alcohol 3 N 4 And (3) introducing 1bar of oxygen into the catalyst, and under the irradiation of an LED light source with the power of 10W and the wavelength of lambda=400-405 nm, stirring at 1500rpm, reacting at 25 ℃ for 20 hours to obtain the benzaldehyde product.
Application of catalyst for preparing benzaldehyde by solvent-free benzyl alcohol oxidation in preparation of benzaldehyde, znO/g-C is prepared 3 N 4 The catalyst and benzyl alcohol are placed in a photocatalysis reaction vessel, and 0.1g ZnO/g-C is added into 400mmol benzyl alcohol 3 N 4 And (3) introducing 1bar of air into the catalyst, and under the irradiation of an LED light source with the power of 10W and the wavelength of lambda=400-405 nm, stirring at 1500rpm, reacting at 25 ℃ for 20 hours to obtain the benzaldehyde product.
Catalyst for preparing benzaldehyde by oxidation of solvent-free benzyl alcoholUse of ZnO/g-C in the preparation of benzaldehyde 3 N 4 The catalyst and benzyl alcohol are placed in a photocatalysis reaction vessel, and 0.1g ZnO/g-C is added into 400mmol benzyl alcohol 3 N 4 Catalyst, let in 1bar of air, 10 a.m. good in summer: 00 pm 16:00, the average temperature is 30 ℃, the stirring speed is 1500rpm, and the reaction time is 6 hours, thus obtaining the product benzaldehyde.
Compared with the prior art, the invention has the following beneficial technical effects:
the method of the invention prepares the visible light catalyst ZnO/g-C 3 N 4 Catalyst, znO is uniformly introduced into g-C 3 N 4 In the structure, the problem of lattice mismatch is solved, and the migration of photo-generated electrons among material junctions is facilitated, so that the generated photo-generated electrons and holes can be effectively separated, and the photocatalytic reaction activity is improved; the invention adopts template agent ammonium chloride to synthesize porous ZnO/g-C 3 N 4 The catalyst increases the surface area of the catalyst, thereby improving the photocatalytic reaction activity. g-C 3 N 4 Can be favorable for benzyl alcohol adsorption, and g-C 3 N 4 The surface of the catalyst has certain hydrophilicity, so that water generated under the solvent-free reaction condition can be effectively adsorbed on the surface of the catalyst, and a water cladding is formed on the surface of the catalyst; as the solubility of the benzyl alcohol in water is far greater than that of the benzaldehyde in water, the adsorption of the benzyl alcohol and the desorption of the benzaldehyde are facilitated, and the selectivity of the reaction is improved.
In addition, the invention has proved by experiments that the catalyst has the best catalytic activity for catalyzing the solvent-free oxidation of benzyl alcohol to prepare benzaldehyde when the calcination temperature is 600 ℃.
Specifically:
(1) by introducing zinc acetate, znO is highly dispersed in g-C under the preparation method of the invention 3 N 4 On the carrier, preconditions are provided for the migration of photogenerated carriers;
(2) the introduction of the template agent ammonium chloride provides a large specific surface area for the catalyst, and is beneficial to the generation of active species and the adsorption and desorption of substrates on products;
(3) the preparation method has the advantages of no need of complex equipment, simple preparation process, low cost of raw materials and low cost, and is suitable for industrial batch production;
(4) the binary material catalyst prepared by the method has excellent activity and selectivity for preparing aldehyde compounds by oxidizing solvent-free benzyl alcohol and derivatives thereof.
Drawings
FIG. 1 shows ZnO/g-C at different calcination temperatures prepared in accordance with an embodiment of the present invention 3 N 4 Catalyst and pure g-C for comparison 3 N 4 Commercial ZnO-C and X-ray diffraction (XRD) patterns for the preparation of ZnO-A;
FIG. 2 shows ZnO/g-C at different calcination temperatures prepared in accordance with the examples of the present invention 3 N 4 Catalyst and pure g-C for comparison 3 N 4 Commercial ZnO-C and Fourier IR spectrA (FT-IR) spectrA for preparing ZnO-A.
Detailed Description
The invention is further described below.
The preparation method of the catalyst for preparing benzaldehyde by solvent-free benzyl alcohol oxidation is characterized in that the catalyst is prepared by taking anhydrous zinc acetate, ammonium chloride and melamine as raw materials, the active center of the catalyst is ZnO, the efficient green conversion of preparing benzaldehyde by solvent-free photocatalytic oxygen oxidation of benzyl alcohol is realized, and the preparation process is as follows:
placing a dispersion containing anhydrous zinc acetate, melamine and ammonium chloride (adopting absolute ethyl alcohol as a solvent) in a magnetic stirrer, stirring for 12h, and volatilizing the dry solvent at 90 ℃; calcining the mixture in a muffle furnace at 500-800 ℃ for 5h in an air atmosphere; finally, grinding to obtain ZnO/g-C 3 N 4 A photocatalyst.
The method specifically comprises the following steps:
a. the molar ratio of the anhydrous zinc acetate to the melamine to the ammonium chloride to the anhydrous ethanol is 1:20:40:500, so as to obtain a mixed solution;
b. stirring the mixed solution on a magnetic stirrer for 12 hours at room temperature;
c. moving to a metal bath at 90 ℃ to volatilize dry solvent while stirring to obtain solid powder;
d. the solid powder was ground and moved into a porcelain boat.
e. And (3) moving the porcelain boat to a muffle furnace, respectively heating to 500, 600, 700 and 800 ℃ at 2.5 ℃/min under the air atmosphere, preserving heat for 5 hours, and naturally cooling.
f. Transferring the product obtained in the step e into an agate mortar, and grinding to obtain ZnO/g-C 3 N 4 -x catalyst (x stands for calcination temperature).
XRD and FT-IR tests were performed on the samples, respectively, with test patterns shown in FIG. 1 and FIG. 2, respectively. The XRD pattern of FIG. 1 shows that the sample is composed of g-C 3 N 4 And ZnO, wherein the different temperatures have a larger influence on the crystal structure of the catalyst, and g-C is present when the temperature is 500-600 DEG C 3 N 4 Diffraction peaks of (2); the temperature is raised to 700-800 ℃, and only the diffraction peak of ZnO exists.
It can be shown in the FT-IR spectrum of fig. 2 that the calcination temperature has an effect on the structure and surface functionality of the catalyst, the results being consistent with XRD.
For the prepared ZnO/g-C 3 N 4 A visible light catalytic activity experiment is carried out, and the process for preparing benzaldehyde by oxidizing benzyl alcohol by the catalyst comprises the following steps:
a: 0.1g ZnO/g-C was added to the photocatalytic reaction tube 3 N 4 -x catalyst, 20-400mmol benzyl alcohol;
b: charging oxygen, air or nitrogen of 1.0atm into the reaction tube;
c: and (3) stirring the reaction tube for 8-24 hours at 25 ℃, and under the irradiation of visible light (lambda=400-405 nm LED lamp) with a light source of 10W, obtaining the product benzaldehyde at a stirring speed of 1500 rpm.
Or the reaction tube is well lighted in summer at 10 a.m.: 00 pm 16:00, the average temperature is 30 ℃, the stirring speed is 1500rpm, and the reaction time is 6 hours, thus obtaining the product benzaldehyde.
The present invention will be described in detail with reference to examples. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
The following detailed description is of embodiments, and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
Example 1
Mixing anhydrous zinc acetate, melamine, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 1:20:40:500 to obtain a mixed solution, stirring for 12 hours, and volatilizing the obtained mixed solution to dry the solvent at 90 ℃. Grinding, transferring the solid powder into a muffle furnace, heating to 500 ℃ at 2.5 ℃/min under the air atmosphere, preserving heat for 5h, and naturally cooling. Grinding and weighing to obtain ZnO/g-C 3 N 4 -500 catalyst.
0.1g of catalyst, 20mmol of benzyl alcohol, 1bar of O 2 The reaction was carried out at 25℃for 12h with a lambda=400-405 nm LED light source, giving a benzaldehyde yield of 69.8%.
Example 2
Mixing anhydrous zinc acetate, melamine, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 1:20:40:500 to obtain a mixed solution, stirring for 12 hours, and volatilizing the obtained mixed solution to dry the solvent at 90 ℃. Grinding, transferring the solid powder into a muffle furnace, heating to 600 ℃ at 2.5 ℃/min under the air atmosphere, preserving heat for 5h, and naturally cooling. Grinding and weighing to obtain ZnO/g-C 3 N 4 -600 catalyst.
0.1g of catalyst, 20mmol of benzyl alcohol, 1bar of O 2 The reaction was carried out at 25℃for 12h with a lambda=400-405 nm LED light source, giving a benzaldehyde yield of 74.6%.
Example 3
Mixing anhydrous zinc acetate, melamine, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 1:20:40:500 to obtain a mixed solution, stirring for 12 hours, and volatilizing the obtained mixed solution to dry the solvent at 90 ℃. Grinding, transferring the solid powder into a muffle furnace, heating to 700 ℃ at 2.5 ℃/min under air atmosphere, and preserving heatAnd 5h, naturally cooling. Grinding and weighing to obtain ZnO/g-C 3 N 4 -700 catalyst.
0.1g of catalyst, 20mmol of benzyl alcohol, 1bar of O 2 The lambda=400-405 nm LED light source was reacted at 25 ℃ for 12 hours to give a benzaldehyde yield of 8.6%.
Example 4
Mixing anhydrous zinc acetate, melamine, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 1:20:40:500 to obtain a mixed solution, stirring for 12 hours, and volatilizing the obtained mixed solution to dry the solvent at 90 ℃. Grinding, transferring the solid powder into a muffle furnace, heating to 800 ℃ at 2.5 ℃/min under the air atmosphere, preserving heat for 5h, and naturally cooling. Grinding and weighing to obtain ZnO/g-C 3 N 4 -800 catalyst.
0.1g of catalyst, 20mmol of benzyl alcohol, 1bar of O 2 The lambda=400-405 nm LED light source was reacted at 25 ℃ for 12 hours to give a benzaldehyde yield of 6.5%.
Comparative example 1
Mixing anhydrous zinc acetate, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 1:40:500 to obtain a mixed solution, stirring for 12 hours, grinding, transferring solid powder into a muffle furnace, heating to 600 ℃ at 2.5 ℃/min under air atmosphere, preserving heat for 5 hours, and naturally cooling. Grinding and weighing to obtain the ZnO-Prepared catalyst.
0.1g of catalyst, 20mmol of benzyl alcohol, 1bar of O 2 The lambda=400-405 nm LED light source was reacted at 25 ℃ for 12 hours to give a benzaldehyde yield of 2.1%.
Comparative example 2
Mixing commercial ZnO, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 1:20:500 to obtain a mixed solution, stirring for 12 hours, grinding, transferring solid powder into a muffle furnace, heating to 600 ℃ at 2.5 ℃/min under air atmosphere, preserving heat for 5 hours, and naturally cooling. Grinding and weighing to obtain the ZnO-Commercial catalyst.
0.1g of catalyst, 20mmol of benzyl alcohol, 1bar of O 2 The lambda=400-405 nm LED light source was reacted at 25 ℃ for 12 hours to give a benzaldehyde yield of 3.5%.
Comparative example 3
Mixing melamine, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 20:40:500 to obtain a mixed solution, stirring for 12 hours, and volatilizing the dry solvent of the obtained mixed solution at 90 ℃. Grinding, transferring the solid powder into a muffle furnace, heating to 600 ℃ at 2.5 ℃/min under the air atmosphere, preserving heat for 5h, and naturally cooling. Grinding and weighing to obtain g-C 3 N 4 A catalyst.
0.1g of catalyst, 20mmol of benzyl alcohol, 1bar of O 2 The lambda=400-405 nm LED light source was reacted at 25 ℃ for 12 hours to give a benzaldehyde yield of 3.8%.
Example 5
Mixing anhydrous zinc acetate, melamine, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 1:20:40:500 to obtain a mixed solution, stirring for 12 hours, and volatilizing the obtained mixed solution to dry the solvent at 90 ℃. Grinding, namely transferring the solid powder into a muffle furnace, heating to 600 ℃ at a speed of 2.5 ℃/min under the air atmosphere, keeping the temperature for 5 hours, naturally cooling, and grinding to obtain ZnO/g-C 3 N 4 -600 catalyst.
0.1g of the catalyst, 20mmol of benzyl alcohol, 1bar of air, lambda=400-405 nm of LED light source were reacted at 25 ℃ for 12 hours to give a benzaldehyde yield of 32%.
Example 6
Mixing anhydrous zinc acetate, melamine, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 1:20:40:500 to obtain a mixed solution, stirring for 12 hours, and volatilizing the obtained mixed solution to dry the solvent at 90 ℃. Grinding, transferring the solid powder into a muffle furnace, heating to 600 ℃ at 2.5 ℃/min under the air atmosphere, preserving heat for 5h, and naturally cooling. Grinding and weighing to obtain ZnO/g-C 3 N 4 -600 catalyst.
0.1g of catalyst, 20mmol of benzyl alcohol, 1bar N 2 The lambda=400-405 nm LED light source was reacted at 25 ℃ for 12 hours to give a benzaldehyde yield of 4.3%.
Example 7
Mixing anhydrous zinc acetate, melamine, ammonium chloride and absolute ethyl alcohol in the molar ratio of 1:20:40:500 to obtain a mixed solution, stirring for 12h, and mixing the obtained mixed solution at 9The dry solvent was evaporated at 0 ℃. Grinding, transferring the solid powder into a muffle furnace, heating to 600 ℃ at 2.5 ℃/min under the air atmosphere, preserving heat for 5h, and naturally cooling. Grinding and weighing to obtain ZnO/g-C 3 N 4 -500 catalyst.
0.1g of the catalyst, 400mmol of benzyl alcohol, 1bar of air, and a lambda=400-405 nm LED light source were reacted at 25 ℃ for 12 hours to give a benzaldehyde yield of 56%.
Example 8
And (3) mixing the anhydrous zinc acetate, the melamine, the ammonium chloride and the absolute ethyl alcohol in a molar ratio of 1:20:40:500 to obtain a mixed solution, stirring for 12 hours, and volatilizing the obtained mixed solution to dry the solvent at 90 ℃. Grinding, transferring the solid powder into a muffle furnace, heating to 600 ℃ at 2.5 ℃/min under the air atmosphere, preserving heat for 5h, and naturally cooling. Grinding and weighing to obtain ZnO/g-C 3 N 4 -600 catalyst.
0.1g of catalyst, 400mmol of benzyl alcohol, 1bar of O 2 Lambda=400-405 nm LED, reacted for 12h at 25 ℃ to give a benzaldehyde yield of 56.8%.
Example 9
Mixing anhydrous zinc acetate, melamine, ammonium chloride and absolute ethyl alcohol according to a molar ratio of 1:20:40:500 to obtain a mixed solution, stirring for 12 hours, and volatilizing the obtained mixed solution to dry the solvent at 90 ℃. Grinding, transferring the solid powder into a muffle furnace, heating to 600 ℃ at 2.5 ℃/min under the air atmosphere, preserving heat for 5h, and naturally cooling. Grinding and weighing to obtain ZnO/g-C 3 N 4 -600 catalyst.
0.1g of catalyst, 400mmol of benzyl alcohol, 1bar of air, 10 a.m. with good sunshine in summer: 00-16:00, the average temperature is 30 ℃, and the reaction is carried out for 6 hours, so that the yield of the benzaldehyde is 22%.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (2)
1. The application of the catalyst for preparing benzaldehyde by solvent-free benzyl alcohol oxidation in preparing benzaldehyde is characterized in that the preparation method of the catalyst for preparing benzaldehyde by solvent-free benzyl alcohol oxidation comprises the following steps:
a: dissolving a zinc source, a precursor and a template agent in a solvent to obtain a mixed solution; the zinc source is anhydrous zinc acetate, the precursor is melamine, the template agent is ammonium chloride, the solvent is absolute ethyl alcohol, and the molar ratio of the anhydrous zinc acetate to the melamine to the ammonium chloride to the absolute ethyl alcohol is 1:20:40:100;
b: uniformly stirring the mixed solution at room temperature, wherein the stirring time at room temperature is 12h;
c: stirring the solution obtained in the step b at 90 ℃ for 12h to completely volatilize the solvent;
d: grinding the mixture obtained in the step c to obtain uniform solid powder;
e: placing the solid powder obtained in the step d into a crucible, capping, heating to 500-800 ℃ at a heating rate of 2.5 ℃/min under an air atmosphere, calcining at a constant temperature of 5h, and naturally cooling to room temperature to obtain yellow ZnO/g-C 3 N 4 Grinding to obtain ZnO/g-C 3 N 4 A catalyst;
the application is specifically as follows: znO/g-C 3 N 4 The catalyst and benzyl alcohol are placed in a photocatalysis reaction vessel, and 0.1g ZnO/g-C is added into 400mmol benzyl alcohol 3 N 4 And (3) introducing 1bar of oxygen into the catalyst, and under the irradiation of an LED light source with the power of 10W and the wavelength of lambda=400-405 nm, stirring at 1500rpm, reacting at 25 ℃ for 20h to obtain the benzaldehyde product.
2. The application of the catalyst for preparing benzaldehyde by solvent-free benzyl alcohol oxidation in preparing benzaldehyde is characterized in that the preparation method of the catalyst for preparing benzaldehyde by solvent-free benzyl alcohol oxidation comprises the following steps:
a: dissolving a zinc source, a precursor and a template agent in a solvent to obtain a mixed solution; the zinc source is anhydrous zinc acetate, the precursor is melamine, the template agent is ammonium chloride, the solvent is absolute ethyl alcohol, and the molar ratio of the anhydrous zinc acetate to the melamine to the ammonium chloride to the absolute ethyl alcohol is 1:20:40:100;
b: uniformly stirring the mixed solution at room temperature, wherein the stirring time at room temperature is 12h;
c: stirring the solution obtained in the step b at 90 ℃ for 12h to completely volatilize the solvent;
d: grinding the mixture obtained in the step c to obtain uniform solid powder;
e: placing the solid powder obtained in the step d into a crucible, capping, heating to 500-800 ℃ at a heating rate of 2.5 ℃/min under an air atmosphere, calcining at a constant temperature of 5h, and naturally cooling to room temperature to obtain yellow ZnO/g-C 3 N 4 Grinding to obtain ZnO/g-C 3 N 4 A catalyst;
the application is specifically as follows: znO/g-C 3 N 4 The catalyst and benzyl alcohol are placed in a photocatalysis reaction vessel, and 0.1g ZnO/g-C is added into 400mmol benzyl alcohol 3 N 4 And (3) introducing 1bar of air into the catalyst, and under the irradiation of an LED light source with the power of 10W and the wavelength of lambda=400-405 nm, stirring at 1500rpm, reacting at 25 ℃ for 20h to obtain the benzaldehyde product.
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