Preparation method of titanium dioxide-palladium composite catalyst

A composite catalyst and titanium dioxide technology, which is applied in the direction of preparation of organic compounds, preparation of amino compounds, physical/chemical process catalysts, etc., can solve the problem of low utilization rate of titanium dioxide carrier

Active Publication Date: 2021-06-01
浙江工业大学上虞研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art, the present invention provides a method for preparing a titanium dioxide-palladium composite catalyst, which solves the problem of low utilization rate of the existing titanium dioxide carrier, and realizes air-permeable and impervious to water by using the nano-titanium dioxide mesoporous structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of titanium dioxide-palladium composite catalyst, comprising the steps of:

[0020] Step 1, adding ethyl cellulose to 1L of absolute ethanol for low-temperature ultrasonic dissolution for 20 minutes, then distilling under reduced pressure to obtain a viscous liquid, which is spun to form nanocellulose filaments; the ethyl cellulose in absolute ethanol Concentration is 40g / L, and the temperature of low-temperature ultrasonic is 3 ℃, and ultrasonic frequency is 60kHz; The temperature of described vacuum distillation is 80 ℃, and pressure is 70% of standard atmospheric pressure; The temperature of described spinning is 100 ℃, and pressure is 0.4MPa, the diameter of the nanocellulose filament is 400nm;

[0021] Step 2, adding palladium acetate and n-butyl titanate to 1L of diethyl ether to form a mixed solution with low-temperature ultrasonication; then spray the mixed solution evenly on the nanofibers, let it stand and dry to obtain the first coating; ...

Embodiment 2

[0026] A preparation method of titanium dioxide-palladium composite catalyst, comprising the steps of:

[0027] Step 1, adding ethyl cellulose to 1L of absolute ethanol for low-temperature ultrasonic dissolution for 25 minutes, then distilling under reduced pressure to obtain a viscous liquid, which is spun to form nanocellulose filaments; the ethyl cellulose in absolute ethanol Concentration is 70g / L, and the temperature of low-temperature ultrasonic is 5 ℃, and ultrasonic frequency is 80kHz; The temperature of described vacuum distillation is 85 ℃, and pressure is 75% of standard atmospheric pressure; The temperature of described spinning is 105 ℃, and pressure is 0.5MPa, the diameter of the nanocellulose filament is 600nm;

[0028] Step 2, adding palladium acetate and n-butyl titanate to 1L of diethyl ether to form a mixed solution with low-temperature ultrasonication; then spray the mixed solution evenly on the nanofibers, let it stand and dry to obtain the first coating; ...

Embodiment 3

[0033] A preparation method of titanium dioxide-palladium composite catalyst, comprising the steps of:

[0034] Step 1, adding ethyl cellulose to 1L of absolute ethanol for low-temperature ultrasonic dissolution for 25 minutes, then distilling under reduced pressure to obtain a viscous liquid, which is spun to form nanocellulose filaments; the ethyl cellulose in absolute ethanol Concentration is 70g / L, and the temperature of cryogenic ultrasonic is 5 ℃, and ultrasonic frequency is 70kHz; The temperature of described vacuum distillation is 85 ℃, and pressure is 75% of standard atmospheric pressure; The temperature of described spinning is 105 ℃, and pressure is 0.5MPa, the diameter of the nanocellulose filament is 600nm;

[0035] Step 2, adding palladium acetate and n-butyl titanate to diethyl ether to form a mixed solution under low-temperature ultrasonication; then spray the mixed solution evenly on the nanofiber filaments, and leave to dry to obtain the first coating; the pa...

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Abstract

The invention belongs to the field of catalysts, and particularly relates to a preparation method of a titanium dioxide-palladium composite catalyst, which comprises the following steps: step 1, adding ethyl cellulose into absolute ethyl alcohol, carrying out low-temperature ultrasonic dissolution for 20-30 minutes, then carrying out reduced pressure distillation to obtain viscous liquid, and spinning to form nano cellulose filaments; step 2, adding palladium acetate and tetrabutyl titanate into diethyl ether, and performing low-temperature ultrasonic treatment to form a mixed solution; and then uniformly spraying the mixed solution on the nanofiber yarns, standing and drying to obtain a first coating film; step 3, adding tetrabutyl titanate into absolute ether, uniformly stirring to form a spray liquid, uniformly coating the surface of the first coating film with the spray liquid, and drying at a constant temperature to obtain a second coating film; and step 4, treating the second coating film in an infrared irradiation kettle for 2-5 hours, and reducing to obtain the titanium dioxide-palladium composite catalyst. The problem that an existing titanium dioxide carrier is not high in utilization rate is solved, and air permeability and water impermeability are achieved through the nanometer titanium dioxide mesoporous structure.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a preparation method of a titanium dioxide-palladium composite catalyst. Background technique [0002] Most of the selective hydrogenation catalysts reported in the literature are supported by alumina, and there are also palladium catalysts supported by titania for selective hydrogenation reactions. A Chinese invention patent (CN1640541A) prepared a supported palladium catalyst with titanium dioxide as a carrier for selective hydrogenation of acetylene. Titanium dioxide is used as a carrier, and the active components are Pd and at least one element in the main group I, the main group II and the group VIII, but there is no catalyst shaping involved in the patent. The Chinese invention patent (CN100341610C) reported a Pd film supported on a titanium dioxide base film. Immerse the inorganic ceramic support body pre-coated with anatase titanium dioxide base film on one side of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44C07C209/36C07C211/52
CPCB01J23/44C07C209/36C07C211/52Y02P20/584
Inventor 许萌方标柯军梁
Owner 浙江工业大学上虞研究院有限公司
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