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A kind of supported heterogeneous catalyst and its preparation method and application

A heterogeneous catalyst, supported technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high cost of peroxyacid and homogeneous catalyst recovery. Utilize problems such as high cost and poor performance stability to achieve the effect of reducing reaction cost

Active Publication Date: 2020-07-28
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditionally, styrene oxide is produced by the catalytic reaction of styrene and peracid (peroxyacid) in a stoichiometric ratio with a homogeneous catalyst, such as a transition metal compound; although this type of catalyst has high catalytic activity, the reaction The obtained peroxyacid has high cost and poor performance stability, and the recycling cost of homogeneous catalyst is high

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  • A kind of supported heterogeneous catalyst and its preparation method and application
  • A kind of supported heterogeneous catalyst and its preparation method and application
  • A kind of supported heterogeneous catalyst and its preparation method and application

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preparation example Construction

[0026] The present invention provides a method for preparing a supported heterogeneous catalyst, including the following steps:

[0027] (1) Coating the carbon nanofiber dispersion on the substrate, and removing the dispersant to obtain a template;

[0028] (2) Depositing alumina on the template obtained in the step (1), and removing the template by calcination to obtain alumina nanotubes;

[0029] (3) Cobalt oxide is deposited on the alumina nanotubes obtained in step (2) to obtain a supported heterogeneous catalyst.

[0030] In the present invention, the carbon nanofiber dispersion is coated on the substrate, and the template is obtained after removing the dispersant. In the present invention, the carbon nanofiber dispersion preferably includes carbon nanofibers and ethanol. The diameter of the carbon nanofibers is preferably 100-120nm, more preferably 100nm; the length is preferably nanometer or micrometer level. Conventional dimensions of commercially available products well know...

Embodiment 1

[0045] Loaded CoO x Catalyst preparation

[0046] Carbon nanofibers are dispersed in ethanol to form a carbon nanofiber ethanol dispersion with a concentration of 0.03g / mL; trimethylaluminum and water are used as precursors to deposit Al 2 O 3 ; Deposit CoO with cobalt and ozone as precursors x Nanoparticles.

[0047] (1) Coat the carbon nanofiber ethanol dispersion evenly on the surface of the glass sheet, evaporate it and place it in the atomic layer deposition vacuum reaction chamber;

[0048] (2) Using the carbon nanofibers prepared in step (1) as a template, the temperature of the cavity during the deposition of alumina is controlled to be 125° C., and the pressure of the cavity is 50 Pa. Use ALD to deposit Al for 50 cycles 2 O 3 Form oxide nanotubes.

[0049] (3) The sample obtained in step (2) is calcined in the air at 500°C to remove the carbon nanofiber template, and then CoO is deposited x Nanoparticles, alumina nanotubes loaded with CoO x Catalyst (x is 4 / 3~2), marked as Co...

Embodiment 2

[0054] Pt and CoO x Preparation of space separation catalyst

[0055] Carbon nanofibers are dissolved in ethanol to form a carbon nanofiber ethanol dispersion with a concentration of 0.03g / mL; trimethyl aluminum and water are used as precursors to deposit Al 2 O 3 ; Depositing Pt nanoparticles with (trimethyl) methylcyclopentadiene platinum and ozone as precursors; depositing CoO with cobalt and ozone as precursors x Nanoparticles.

[0056] (1) Coat carbon nanofibers on a glass sheet, evaporate and place them in an atomic layer deposition vacuum reaction chamber, and deposit 20 cycles of Pt nanoparticles. The deposition conditions: the temperature of the chamber is 250°C, the chamber The body pressure is 50Pa, and the volume ratio of the carrier gas to the vacuum reaction chamber is 1 / 8min during the deposition process -1 Inject carrier gas into the cavity;

[0057] (2) Then deposit 30 cycles of Al on the Pt nanoparticle layer of step (1) 2 O 3 To form oxide nanotubes, the deposition...

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Abstract

The invention belongs to the technical field of catalytic materials, and particularly relates to a supported heterogeneous catalyst and a preparation method and application thereof. The supported heterogeneous catalyst provided by the invention comprises aluminum oxide nanotubes and cobalt oxide deposited on the outer surfaces of the aluminum oxide nanotubes. The aluminum oxide nanotubes are usedas a carrier, cobalt oxide as an active component is deposited on the outer surface of the carrier, the active component can be uniformly dispersed, and thus, the catalyst with high activity is obtained. The result of an embodiment shows that when the catalyst provided by the invention is used for styrene epoxidation reaction, the selectivity reaches 74.3-94.8%, and meanwhile, the conversion ratereaches 77.2-91.4%.

Description

Technical field [0001] The invention belongs to the technical field of catalytic materials, and specifically relates to a supported heterogeneous catalyst and a preparation method and application thereof. Background technique [0002] Styrene oxide is an important organic intermediate, mainly used in the synthesis of fragrances, medicines, and the preparation of advanced coatings. It can also be used as epoxy resin diluent, UV-absorber, flavoring agent and stabilizer. Traditionally, styrene oxide is produced by a homogeneous catalyst such as a transition metal compound in a stoichiometric ratio of styrene and peracid (peroxy acid). Although this type of catalyst has high catalytic activity, it is used for reaction. The obtained peroxyacid has high cost, poor performance stability, and high cost of recycling the homogeneous catalyst. Therefore, the development of a new type of catalyst to reduce the production cost of styrene oxide has become the main task currently facing. Summ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J23/89C07D303/04C07D301/19
CPCB01J23/75B01J23/8913C07D301/19C07D303/04
Inventor 覃勇熊咪高哲邢双凤
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI