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High-dispersion metal-oxide bifunctional catalyst and preparation method and application thereof

A dual-function catalyst, high dispersion technology, applied in metal/metal oxide/metal hydroxide catalysts, carbon compound catalysts, physical/chemical process catalysts, etc., can solve the problem of low catalytic activity of indium oxide, high reaction temperature, low temperature Catalyst stability and other issues, to achieve the effect of simple preparation process, high metal dispersion, and avoiding the formation of green oil

Active Publication Date: 2020-09-08
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with other noble metal catalysts, the catalytic activity of indium oxide is low, and the reaction temperature required for the complete conversion of acetylene is as high as 550K
This temperature is much higher than the temperature of the industrial acetylene selective hydrogenation reaction process, and the higher reaction temperature will easily lead to the formation of green oil and reduce the stability of the catalyst

Method used

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  • High-dispersion metal-oxide bifunctional catalyst and preparation method and application thereof
  • High-dispersion metal-oxide bifunctional catalyst and preparation method and application thereof
  • High-dispersion metal-oxide bifunctional catalyst and preparation method and application thereof

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Effect test

Embodiment 1

[0068] Embodiment 1, preparation carrier In 2 o 3 A

[0069] The carrier In of this embodiment 2 o 3 The preparation of A comprises the steps:

[0070] (a), 5g of indium precursor-indium nitrate hydrate was dissolved in 20mL of absolute ethanol (a purity of 99.8% or more) and 75mL of deionized water, and dissolved evenly to obtain an ethanol aqueous solution of the indium precursor, which was packed in a reactor; 15mL 25wt% ammonia is mixed with 25mL absolute ethanol (more than 99.8% in purity) to obtain an ammonia-ethanol mixture; the reactor is placed in a water bath, and the temperature of the water bath is controlled to be 80°C, and then the ammonia-ethanol mixture is mixed under stirring conditions. Add the indium precursor into the aqueous ethanol solution of the indium precursor at a rate of 4 mL / min by means of a convection pump. After the addition, continue to insulate and stir the reaction for 30 minutes to complete the reaction, and obtain a mixed solution con...

Embodiment 2

[0074] Embodiment 2, preparation carrier In 2 o 3 B

[0075] The carrier In of this embodiment 2 o 3 The preparation steps of B are basically the same as in Example 1, the difference is:

[0076] In step (b), the calcination temperature is 600°C, and the carrier In 2 o 3 b.

[0077] The carrier In prepared in this example 2 o 3 The adsorption-desorption curve of B and figure 2 similar. CarrierIn 2 o 3 The specific surface area of ​​B is 85.40m 2 / g;

[0078] CarrierIn 2 o 3 The scanning electron microscope of B as Figure 4 shown. Depend on Figure 4 It can be seen that the carrier In 2 o 3 B also has a loose porous structure and a uniform indium oxide surface.

Embodiment 3

[0079] Embodiment 3, preparation carrier In 2 o 3 C

[0080] The preparation steps of this embodiment are basically the same as in Example 1, the difference is:

[0081] In step (b), the calcination temperature is 500°C, and the carrier In 2 o 3 c.

[0082] The carrier In prepared in this example 2 o 3 The adsorption-desorption curve of C and figure 2 similar. CarrierIn 2 o 3 The specific surface area of ​​C is 93.80m 2 / g;

[0083] CarrierIn 2 o 3 SEM of B with Figure 4 Similarly, it can be seen that the carrier In 2 o 3 C also has a loose porous structure and a uniform indium oxide surface.

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Abstract

The invention discloses a high-dispersion metal-oxide bifunctional catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing an ethanol aqueous solution of an indium precursor, then adding a proper amount of an ammonia water-ethanol mixed solution under a stirring condition, controlling the reaction temperature to be 60-100 DEG Cin the adding process, after the addition is finished, continuously carrying out heat preservation and stirring for complete reaction to obtain a mixed solution containing indium hydroxide, cooling,carrying out suction filtration, washing, drying and calcining the mixed solution containing indium hydroxide to obtain a carrier In2O3, (2) uniformly dispersing the carrier In2O3 in a proper amount of absolute ethyl alcohol to obtain a dispersion liquid, and depositing metal atoms M on the carrier In2O3 by using an atomic layer deposition technology to obtain an M-In2O3 catalyst, and (3) carryingout thermal reduction on the M-In2O3 catalyst to obtain the high-dispersion metal-oxide bifunctional catalyst. The high-dispersion metal-oxide bifunctional catalyst has the characteristics of high catalytic activity, low reaction temperature, high ethylene selectivity and long service life.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a high-dispersion metal-oxide dual-function catalyst and its preparation method and application. Background technique [0002] Ethylene is an important industrial raw material, mainly used in large-scale production of polyethylene, polyvinyl chloride, ethylene oxide, ethanol, acetaldehyde, vinyl acetate and its polymers, ethylbenzene and other products. The existing industrial production routes of ethylene mainly include naphtha steam cracking route and calcium carbide method to produce acetylene, and then the route of producing ethylene through selective hydrogenation of acetylene. [0003] For the naphtha steam cracking route, the ethylene product from the naphtha steam cracking furnace contains a small amount of acetylene (0.5-2%), and these small amounts of acetylene will poison the catalyst in the downstream polymerization process. Therefore, accord...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J35/10C07C5/09C07C11/04
CPCB01J23/62C07C5/09C07C2523/62B01J35/394B01J35/613B01J35/615B01J35/647C07C11/04Y02P20/52
Inventor 曹约强李雨柔段学志葛小虎周兴贵
Owner EAST CHINA UNIV OF SCI & TECH
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