Composite catalyst for directly preparing high-value aromatic hydrocarbons from carbon dioxide as well as preparation method and application

A composite catalyst, carbon dioxide technology, used in catalyst activation/preparation, hydrocarbon production from carbon oxides, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high selectivity of by-product carbon monoxide and high conversion rate of carbon dioxide , low carbon dioxide conversion rate, etc., to achieve good industrial application prospects, improve conversion rate, and reduce the effect of greenhouse effect

Active Publication Date: 2020-06-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The first object of the present invention is to provide a composite catalyst for the direct production of high-value aromatics from carbon dioxide, which has a high carbon dioxide conversion rate and low carbon monoxide selectivity during use, and has a three-layer porous core-shell structure, which solves the common problems in the prior art The conversion rate of carbon dioxide is low, the selectivity of by-product carbon monoxide is high, and the liquid phase product is C 5+ Technical issues with low selectivity

Method used

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  • Composite catalyst for directly preparing high-value aromatic hydrocarbons from carbon dioxide as well as preparation method and application
  • Composite catalyst for directly preparing high-value aromatic hydrocarbons from carbon dioxide as well as preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0055] The first step, the preparation method of iron-copper metal oxide comprises the following steps:

[0056] Dissolve 30.3g of ferric nitrate nonahydrate and 18.12g of copper nitrate trihydrate in 150ml of deionized water to prepare a precursor solution, and stir and heat it in a constant temperature water bath to completely dissolve it. Weigh sodium hydroxide and dissolve it in water to prepare a precipitant with a concentration of 1mol / L. Under constant temperature conditions at a temperature of 70°C, slowly add sodium hydroxide solution dropwise to the precursor solution (dropping at a rate of every two seconds) , and keep stirring, monitor the pH of the solution by a pH meter, stop adding the sodium hydroxide solution dropwise when the pH reaches 6.7-7.0, keep the temperature constant and keep stirring, and age the generated precipitate for 30 minutes.

[0057] The obtained precipitate was separated by suction filtration, and the obtained filter cake was washed with 80...

Embodiment 2

[0073] The first step, the preparation method of iron-copper metal oxide comprises the following steps:

[0074] Dissolve 30.3g of ferric nitrate nonahydrate and 3.624g of copper nitrate trihydrate in 150ml of deionized water to prepare a precursor solution, and stir and heat it in a constant temperature water bath to completely dissolve it. Weigh sodium hydroxide and dissolve it in water to prepare a precipitant with a concentration of 1mol / L. Under constant temperature conditions at a temperature of 70°C, slowly add sodium hydroxide solution dropwise to the precursor solution (dropping at a rate of every two seconds) , and keep stirring, monitor the pH of the solution by a pH meter, stop adding the sodium hydroxide solution dropwise when the pH reaches 6.7-7.0, keep the temperature constant and keep stirring, and age the generated precipitate for 30 minutes.

[0075] The obtained precipitate was separated by suction filtration, and the obtained filter cake was washed with 80...

Embodiment 3

[0091] The first step, the preparation method of iron-copper metal oxide comprises the following steps:

[0092] Dissolve 30.3g of ferric nitrate nonahydrate and 1.812g of copper nitrate trihydrate in 150ml of deionized water to prepare a precursor solution, and stir and heat it in a constant temperature water bath to completely dissolve it. Weigh sodium hydroxide and dissolve it in water to prepare a precipitant with a concentration of 1mol / L. Under constant temperature conditions at a temperature of 70°C, slowly add sodium hydroxide solution dropwise to the precursor solution (dropping at a rate of every two seconds) , and keep stirring, monitor the pH of the solution by a pH meter, stop adding the sodium hydroxide solution dropwise when the pH reaches 6.7-7.0, keep the temperature constant and keep stirring, and age the generated precipitate for 30 minutes.

[0093] The obtained precipitate was separated by suction filtration, and the obtained filter cake was washed with 80...

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Abstract

The invention discloses a composite catalyst for directly preparing high-value aromatic hydrocarbons from carbon dioxide. The catalyst has a three-layer porous core-shell structure, the inner layer isa metal modified metal oxide, the middle layer is a microporous SiO2 thin layer coated with the metal modified metal oxide, the outer layer is an HZSM-5 molecular sieve layer, and the metal oxide ismodified by at least one of sodium, potassium, zinc, manganese, cerium and zirconium. The preparation method of the composite catalyst for directly preparing the high-value aromatic hydrocarbons fromcarbon dioxide is simple, the precursor is cheap and easy to obtain, and the prepared catalyst is high in mechanical strength, strong in reducing capacity and high in stability and has industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide capture and utilization, and in particular relates to a composite catalyst for directly producing high-value aromatics from carbon dioxide, a preparation method and application thereof. Background technique [0002] Aromatic hydrocarbons are important basic chemical raw materials in the chemical industry. They are widely used in the three major synthetic materials, fine chemical synthesis, organic solvents, pesticides, explosives, and military industries. Therefore, the market demand is very large, and the most widely used ones are mainly Benzene, toluene, xylene (benzene, toluene, xylene, BTX) and durene, etc. The traditional production of aromatics mainly relies on petroleum, and the production technologies include catalytic reforming of naphtha, steam cracking and catalytic cracking of light cycle oil, etc. The petroleum production route of aromatics is inefficient, consumes a lot of en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J23/78B01J23/80B01J23/89B01J29/40B01J35/00B01J35/02B01J37/16C07C1/12C07C15/02
CPCB01J29/46B01J35/0073B01J35/026B01J37/16B01J23/78B01J29/40B01J23/80B01J23/8926C07C1/12C07C15/02Y02P20/52
Inventor 刘殿华宋贵瑶李旻哲
Owner EAST CHINA UNIV OF SCI & TECH
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