Porous titanium dioxide nano material, metal nanoparticle modified porous titanium dioxide photocatalytic material and preparation method and application of metal nanoparticle modified porous titanium dioxide photocatalytic material

A technology of porous titanium dioxide and metal nanoparticles, which is applied in the field of photocatalytic materials and their preparation, porous titanium dioxide nanomaterials, can solve the problems of high cost and high energy consumption, and achieve the reduction of hydrolysis speed, prolongation of reaction time and homogenization degree high effect

Pending Publication Date: 2021-11-05
曹洋
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Problems solved by technology

[0005] The purpose of the present invention is to provide porous titanium dioxide nanomaterials, metal nanoparticle modified porous titanium dioxide photocatalytic materials and their preparation methods and applications, so as to solve the problem of high energy consumption and high cost in the production of low-carbon hydrocarbon products such as ethylene from methane question

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  • Porous titanium dioxide nano material, metal nanoparticle modified porous titanium dioxide photocatalytic material and preparation method and application of metal nanoparticle modified porous titanium dioxide photocatalytic material
  • Porous titanium dioxide nano material, metal nanoparticle modified porous titanium dioxide photocatalytic material and preparation method and application of metal nanoparticle modified porous titanium dioxide photocatalytic material
  • Porous titanium dioxide nano material, metal nanoparticle modified porous titanium dioxide photocatalytic material and preparation method and application of metal nanoparticle modified porous titanium dioxide photocatalytic material

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preparation example Construction

[0044] The present invention also provides a method for preparing porous titanium dioxide nanomaterials, which includes the following steps: adding urea and titanium source into the aqueous solution, heating to 80-120°C, and keeping it warm for 1-3 days, and the obtained product is treated to obtain a white Powdered porous titania nanomaterials. The reaction temperature for heating is preferably 85 to 115°C, more preferably 90 to 110°C.

[0045] Further, the processing step includes: washing the product with distilled water and ethanol respectively, and drying at 30-80°C for 1-10 hours. The treatment conditions are preferably 40-70°C for 3-8 hours; more preferably 45-65°C for 5-7 hours.

[0046] The present invention also provides a metal nanoparticle-modified porous titanium dioxide modified photocatalytic material, using the above-mentioned porous titanium dioxide nanomaterial, the photocatalytic material is prepared by adding the porous titanium dioxide nanomaterial to a s...

Embodiment 1

[0062] Add urea and isopropyl titanate at a mass ratio of 1:1 to water respectively, and then heat to 100° C. for 2 days to react. Subsequently, the product was washed with distilled water and ethanol respectively, and dried to obtain porous titanium dioxide as a white powder material. Take 0.2g of porous titanium dioxide and evenly spread it on the surface of the quartz reactor, eliminate the air by decompression treatment, then fill the quartz reactor with 5ml (about 200μmol) of methane gas, and use a 100W wavelength at 200 ~ 400nm at room temperature The ultraviolet light source irradiated the reactor for 1 h, and the composition of the product was analyzed by gas chromatography equipped with an FID detector. The composition of the product is: ethylene 95.4%, ethane 3.6%.

[0063] Example 1 obtains porous titanium dioxide and carries out electron microscope characterization, and its result is as follows figure 1 As shown, the results show that the particle size of the por...

Embodiment 2

[0065] Add urea and tetraisopropyl titanate at a mass ratio of 1:1 to water respectively, and then heat to 100° C. for 2 days to react. Subsequently, the product was washed with distilled water and ethanol, and dried to obtain white powdery porous titanium dioxide. Subsequently, 1 gram of porous titanium dioxide was dispersed in water, 6.65 mg of chloroplatinic acid was added, and then the chloroplatinic acid was decomposed by ultraviolet light to generate platinum nanoparticles, which were modified in the porous titanium dioxide.

[0066] Take 0.2g of porous titanium dioxide and evenly spread it on the surface of the quartz reactor, eliminate the air by decompression treatment, then fill the quartz reactor with 5ml (about 200 μmol) of methane gas, and use a 100W wavelength at 200 ~ 400nm at room temperature The reactor was irradiated with ultraviolet light source for 1 h, and the product composition was analyzed by gas chromatography equipped with FID detector. The product c...

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Abstract

The invention discloses a porous titanium dioxide nano material, a metal nanoparticle modified porous titanium dioxide photocatalytic material and a preparation method and application of the metal nanoparticle modified porous titanium dioxide photocatalytic material, and belongs to the technical field of methane photochemical catalysis. The photocatalytic material provided by the invention is porous titanium dioxide and a composite material of porous titanium dioxide modified multiple metal nanoparticles, can perform photocatalysis on methane at a temperature as low as room temperature, avoids high energy consumption and danger in a high-temperature thermal catalytic reaction process, and can prevent methane from being excessively reduced to generate carbon deposition in a mild reaction process, and thus the service life of the catalyst is improved. Through different combinations of titanium dioxide and metal in the catalyst, the variety and distribution of hydrocarbons generated by the catalytic reaction can be regulated and controlled, and olefins are generated in a relatively high proportion. Good catalytic activity is shown by investigating the durability of the catalytic reaction in a catalytic cycle form, the catalytic reaction cycle can be stabilized for at least 50 times, and the total catalytic reaction time at least reaches 2 weeks.

Description

technical field [0001] The invention relates to the technical field of methane photochemical catalysis, in particular to porous titanium dioxide nanomaterials, metal nanoparticles modified porous titanium dioxide photocatalytic materials, preparation methods and applications thereof. Background technique [0002] As the main component of natural gas, methane is an important gas deposit, and the proven reserves in the world are as high as 150.19×10 12 m 3 . However, the carbon-hydrogen bonds of methane molecules are extremely stable, difficult to break, and difficult to produce controllable chemical reactions, so they are not suitable for use as raw materials in the chemical industry. [0003] As an important carbon-containing raw material, methane has been found to have relatively high reserves. In recent years, it has been widely concerned due to the large amount of methane in the form of shale gas and combustible ice. At present, carbon raw materials with methane as the...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/42B01J23/50B01J23/52B01J35/00B01J35/02B01J35/10B01J37/10B01J37/34C07C2/76C07C11/04C07C11/06C07C9/06C07C9/08C07C9/10
CPCB01J37/10B01J37/345B01J21/063B01J23/42B01J23/52B01J23/50C07C2/76B01J35/393B01J35/39B01J35/40B01J35/60C07C11/04C07C11/06C07C9/06C07C9/08C07C9/10Y02P20/52
Inventor 曹洋
Owner 曹洋
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