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Method for carbon dioxide hydrogenation to synthesize low-carbon olefins using iron-based catalyst

A technology for iron-based catalysts and low-carbon olefins, which is used in catalyst activation/preparation, chemical instruments and methods, and hydrocarbon production from carbon oxides, etc., to achieve the effects of high stability, stable properties, and simple preparation methods

Active Publication Date: 2022-04-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is to solve the problem of carbon dioxide hydrogenation synthesis of low-carbon olefin catalysts, to provide a new catalyst for carbon dioxide hydrogenation synthesis of low-carbon olefins, the catalyst has a high CO 2 Conversion rate and high selectivity of low carbon olefins, and has high stability

Method used

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  • Method for carbon dioxide hydrogenation to synthesize low-carbon olefins using iron-based catalyst
  • Method for carbon dioxide hydrogenation to synthesize low-carbon olefins using iron-based catalyst

Examples

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Embodiment 1

[0038] Weigh 11.84g magnesium nitrate (Mg(NO 3 ) 2 ) and 96.96g iron nitrate (Fe(NO 3 ) 3 9H 2 O) was dissolved in 200ml deionized water to make solution A. Take by weighing 50.88g anhydrous sodium carbonate (NaCO 3 ) and 20.48g of sodium hydroxide (NaOH) were dissolved in 100ml of deionized water to obtain solution B. Put solution B in a 40°C water bath, add solution A to it at a rate of 3ml / min under vigorous stirring, and add 10ml of 1mol / L NaOH solution to adjust the pH to about 10. The mixture was then aged for 12 h with stirring in a 70 °C water bath. After filtering and washing the obtained turbid liquid, the filter cake was dried at 80° C. for 12 hours to obtain a hydrotalcite precursor C.

[0039] Weigh 2.0g of the above solid C, weigh 0.052g of potassium nitrate (KNO 3 ) was dissolved in 2ml deionized water to form a solution, and the above solid C sample was immersed in the above KNO 3 solution and mix it well. Immerse at room temperature for 12 hours, dry...

Embodiment 2

[0042] Weigh 11.84g magnesium nitrate (Mg(NO 3 ) 2 ) and 64.64g iron nitrate (Fe(NO 3 ) 3 9H 2 O) was dissolved in 200ml deionized water to make solution A. Take by weighing 33.92g anhydrous sodium carbonate (NaCO 3 ) and 15.36g of sodium hydroxide (NaOH) were dissolved in 100ml of deionized water to obtain solution B. Put solution B in a 40°C water bath, add solution A to it at a rate of 3ml / min under vigorous stirring, and add 10ml of 1mol / L NaOH solution to adjust the pH to about 10. The mixture was then aged for 12 h with stirring in a 70 °C water bath. After filtering and washing the obtained turbid liquid, the filter cake was dried at 80° C. for 12 hours to obtain a hydrotalcite precursor C.

[0043] Weigh 2.0g of the above solid C, weigh 0.052g of potassium nitrate (KNO 3 ) was dissolved in 2ml deionized water to form a solution, and the above solid C sample was immersed in the above KNO 3 solution and mix it well. Immerse at room temperature for 12 hours, dry...

Embodiment 3

[0046] Weigh 11.84g magnesium nitrate (Mg(NO 3 ) 2 ) and 32.32g iron nitrate (Fe(NO 3 ) 3 9H 2 O) was dissolved in 200ml deionized water to make solution A. Take by weighing 16.96g anhydrous sodium carbonate (NaCO 3 ) and 10.24g of sodium hydroxide (NaOH) were dissolved in 100ml of deionized water to obtain solution B. Place solution B in a 40°C water bath, add solution A to it at a rate of 3ml / min under vigorous stirring, and add 10ml of 1mol / L NaOH solution to adjust the pH to 10. The mixture was then aged for 12 h with stirring in a 70 °C water bath. After filtering and washing the obtained turbid liquid, the filter cake was dried at 80° C. for 12 hours to obtain a hydrotalcite precursor C.

[0047] Weigh 2.0g of the above solid C, weigh 0.052g of potassium nitrate (KNO 3 ) was dissolved in 2ml deionized water to form a solution, and the above solid C sample was immersed in the above KNO 3 solution and mix it well. Immerse at room temperature for 12 hours, dry at ...

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Abstract

The invention relates to an iron-based catalyst for carbon dioxide hydrogenation to synthesize low-carbon olefins and its preparation method and application, which mainly realizes the direct conversion of CO 2 The hydrogenation is converted into low-carbon olefins, and high selectivity of low-carbon olefins is obtained, and it has high stability. The catalyst used in the present invention includes the following components in parts by mass: a) iron element or its oxide, accounting for 5% to 88%; One or more than two, the number of shares is 10-80%. c) Any one or two or more selected from the oxides of lithium, sodium, potassium, rubidium, and cesium, and the proportion is 0.001-20%. The catalyst provided by the invention can directly convert CO 2 Converted to light olefins, CO 2 The conversion rate of the method can reach 43.5%, the selectivity of methane is less than 10%, and the carbon-based selectivity of light olefins reaches 46%.

Description

technical field [0001] The invention relates to an iron-based catalyst for carbon dioxide hydrogenation to synthesize low-carbon olefins, a preparation method and application thereof. Background technique [0002] In recent years, atmospheric CO 2 The concentration has gradually increased, leading to a series of environmental problems such as global warming and ocean acidification, which has aroused widespread concern from people all over the world. CO 2 It is not only a greenhouse gas, but also a carbon resource, which should be comprehensively utilized. H obtained from renewable energy sources 2 with CO 2 The hydrogenation reaction can obtain CO, CH 4 , low-carbon olefins, gasoline, aromatics and other valuable chemicals, among which low-carbon olefins are one of the most basic raw materials in the chemical industry. The traditional production method of low-carbon olefins is mainly obtained by cracking naphtha and dehydrogenation of low-carbon alkanes. Using CO 2 H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J37/02B01J37/03B01J37/08B01J37/18C07C1/12C07C11/04C07C11/06C07C11/08
CPCC07C1/12B01J23/78B01J37/0201B01J37/031B01J37/088B01J37/18C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 黄延强梁兵连段洪敏张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI