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A kind of carbon dioxide hydrogenation catalyst for producing light olefins and its preparation method and application

A technology of low-carbon olefins and carbon dioxide, applied in the field of carbon dioxide hydrogenation to low-carbon olefins catalysts and its preparation, can solve the problems of low utilization rate, high selectivity of by-product methane, low selectivity of low-carbon olefins, etc., to achieve cheap and simple , uniform and controllable shape, and good stability

Active Publication Date: 2021-01-29
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the low carbon olefin selectivity, high selectivity of by-product methane, CO 2 Low utilization rate and other problems, and provide a carbon dioxide hydrogenation to low-carbon olefins catalyst and its preparation method and application, specifically a manganese-modified iron-based catalyst and its surface for carbon dioxide hydrogenation to low-carbon olefins Preparation method and application

Method used

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  • A kind of carbon dioxide hydrogenation catalyst for producing light olefins and its preparation method and application
  • A kind of carbon dioxide hydrogenation catalyst for producing light olefins and its preparation method and application
  • A kind of carbon dioxide hydrogenation catalyst for producing light olefins and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0030] (1) Catalyst preparation:

[0031] ① Preparation of magnetic Fe with uniform particle size by hydrothermal synthesis 3 o 4 Nanospheres: Dissolve ferric chloride in ethylene glycol, then add sodium acetate, ethylenediamine and polyvinylpyrrolidone, the molar ratio of ferric chloride, sodium acetate and ethylenediamine is: 1:9:15 , the addition of the polyvinylpyrrolidone is 1.23 times of the weight of ferric chloride, and it is stirred until it is completely dissolved; ℃ hydrothermal reaction for 12 hours; after cooling down to room temperature, the obtained product was transferred to a beaker, washed with deionized water and absolute ethanol for 3 times, and then dried at 60 ℃ to obtain Fe 3 o 4 For nanospheres, the particle size is mainly concentrated at 120±12nm.

[0032] ② Fe 3 o 4 The surface of the nanosphere is pretreated: weigh 1g of Fe prepared in step ① 3 o 4 Nanospheres were placed in a glass cup, 5mL of ethylene glycol was added, and ultrasonically di...

Embodiment 2

[0038] The preparation of the catalyst refers to Example 1, the difference is that the concentration of step 3. manganese nitrate solution is 0.92mol / L, and the loading of manganese in the finally prepared catalyst is 10%wt, recorded as 10Mn-Fe 3 o 4 , the rest of the steps are the same as in Example 1.

[0039] The 10Mn-Fe that embodiment 2 prepares 3 o 4 The catalyst was scanned by a transmission electron microscope to observe the morphology of the catalyst and the corresponding element distribution. The results are shown in figure 1 shown. Depend on figure 1 It can be seen that the prepared catalyst has a uniform and stable morphology, and the manganese element is evenly distributed in the Fe 3 o 4 microsphere surface.

Embodiment 3

[0041] The preparation of the catalyst refers to Example 1, the difference is that the concentration of step ③ manganese nitrate solution is 1.84mol / L, and the loading of manganese in the finally prepared catalyst is 20%wt, recorded as 20Mn-Fe 3 o 4 , the rest of the steps are the same as in Example 1.

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Abstract

The invention discloses a catalyst for producing low-carbon olefins by hydrogenation of carbon dioxide, a preparation method and application thereof. The catalyst is Fe with manganese additives on the surface 3 o 4 Nano balls, the manganese additive loading in the catalyst is 5-20%wt. Catalyst provided by the invention has higher CO 2 Conversion rate and low-carbon olefin selectivity, the yield of low-carbon olefins generated by catalytic carbon dioxide hydrogenation is high, and the by-products CO and CH 4 low selectivity. The method for preparing and modifying the catalyst is cheap and simple, and the obtained catalyst has a uniform and controllable morphology and good stability, and has good industrial application prospects.

Description

Technical field: [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for producing low-carbon olefins by hydrogenation of carbon dioxide, a preparation method and application thereof. Background technique: [0002] The burning of traditional fossil fuels (including oil, coal, natural gas, etc.), the sharp rise in carbon dioxide emissions from industry and life has affected people's daily life. According to research data from the International Energy Agency, as early as 2006, China surpassed the United States to become the country with the highest carbon dioxide emissions in the world. How to effectively reduce carbon dioxide emissions, sequester and utilize carbon dioxide is one of the most serious issues facing our country at present. By converting carbon dioxide into high value-added chemicals, on the one hand, it can effectively alleviate the greenhouse gas effect caused by carbon dioxide, and on the other hand, the high value-ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J35/08B01J37/10B01J37/02B01J37/08C07C11/04C07C11/06C07C11/08C07C1/12
CPCC07C1/12B01J23/002B01J23/8892B01J37/0201B01J37/082B01J37/10C07C2523/889B01J35/393B01J35/23B01J35/399B01J35/51C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 王晨光田志鹏马隆龙陈伦刚刘琪英张兴华张琦
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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