Iron-based catalyst for preparing ethanol by CO2 hydrogenation, and preparation method and application thereof

An iron-based catalyst, a technology for producing ethanol, applied in catalyst activation/preparation, hydroxyl compound preparation, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of large output and low ethanol selectivity, and achieve The effect of efficient conversion of CO2, alleviation of environmental pressure, and regulation of product selectivity

Active Publication Date: 2020-09-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing catalyst CO 2 Iron-based catalysts for hydrogenation to ethanol have the disadvantages of high output of by-product CO and relatively low selectivity to ethanol

Method used

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  • Iron-based catalyst for preparing ethanol by CO2 hydrogenation, and preparation method and application thereof
  • Iron-based catalyst for preparing ethanol by CO2 hydrogenation, and preparation method and application thereof
  • Iron-based catalyst for preparing ethanol by CO2 hydrogenation, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] a CO 2 The preparation method of the iron-based catalyst of hydrogenation ethanol, comprises the steps:

[0039] 1) dissolving the auxiliary salt lithium citrate into solvent water to obtain an aqueous solution of lithium citrate;

[0040] 2) Lithium citrate aqueous solution impregnated into Fe 3 o 4 On the catalyst powder, after stirring evenly, dry at 120°C for 12 hours to obtain the catalyst;

[0041] 3) The catalyst is compressed at 10MPa, and then granulated to 20-40 mesh to obtain the catalyst;

[0042] 4) Load 0.5g of catalyst, and first reduce it with synthesis gas. The specific reduction condition is 300°C, and the gas velocity is

[0043] 4500h -1 (V / V), the reduction time is 10 h, and after the reduction is completed, the catalyst is lowered to room temperature with nitrogen to obtain the product. Fe in the product 5 C 2 / Fe 2 C / Fe 3 The ratio of C is finally adjusted to 20 / 8 / 4.

[0044] Efficient catalytic conversion of CO 2 Experimental conditio...

Embodiment 2

[0047] a CO 2 The preparation method of the iron-based catalyst of hydrogenation ethanol, comprises the steps:

[0048] 1) dissolving the auxiliary salt trisodium citrate into solvent water to obtain an aqueous solution of trisodium citrate;

[0049] 2) Immerse trisodium citrate aqueous solution into Fe 3 o 4 On the catalyst powder, after stirring evenly, dry at 120°C for 12 hours to obtain the catalyst;

[0050] 3) The catalyst is compressed at 10MPa, and then granulated to 20-40 mesh to obtain the catalyst;

[0051] 4) Load 0.5g of catalyst, first reduce it with synthesis gas, the specific reduction condition is 300°C, and the gas velocity is 4500h -1 (V / V), the reduction time is 10 h, and after the reduction is completed, the catalyst is lowered to room temperature with nitrogen to obtain the product.

[0052] Efficient catalytic conversion of CO 2 Experimental conditions: fixed bed reactor, temperature 300°C, pressure 3MPa, mixed gas H 2 / CO 2 =3, gas velocity is 2...

Embodiment 3

[0056] a CO 2 The preparation method of the iron-based catalyst of hydrogenation ethanol, comprises the steps:

[0057] 1) dissolving the auxiliary salt tripotassium citrate into solvent water to obtain tripotassium citrate aqueous solution;

[0058] 2) Immerse tripotassium citrate aqueous solution into Fe 3 o 4 On the catalyst powder, after stirring evenly, dry at 120°C for 12 hours to obtain the catalyst;

[0059] 3) The catalyst is compressed at 10MPa, and then granulated to 20-40 mesh to obtain the catalyst;

[0060] 4) Load 0.5g of catalyst, first reduce it with synthesis gas, the specific reduction condition is 300°C, and the gas velocity is 4500h -1 (V / V), the reduction time is 10 h, and after the reduction is completed, the catalyst is lowered to room temperature with nitrogen to obtain the product.

[0061] Efficient catalytic conversion of CO 2 Experimental conditions: fixed bed reactor, temperature 300°C, pressure 3MPa, mixed gas H 2 / CO 2 =3, gas velocity i...

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Abstract

The invention discloses an iron-based catalyst for preparing ethanol by CO2 hydrogenation, and a preparation method and application thereof. The active sites of the iron-based catalyst for preparing ethanol by CO2 hydrogenation comprise Fe5C2, Fe2C and Fe3C, and the mass ratio of Fe5C2 to Fe2C to Fe3C is (20-36): (7-12): (4-6). The invention also discloses the preparation method and application ofthe catalyst. In the process of preparing ethanol by CO2 hydrogenation, the catalyst has ethanol selectivity of more than or equal to 20% and CO selectivity of less than or equal to 10%; according tothe catalyst prepared by the preparation method of the iron-based catalyst for preparing ethanol by CO2 hydrogenation, the efficient synergistic effect of the auxiliary agent and the active metal iron oxide is realized; and the auxiliary agent effectively changes the reducibility of active metal iron oxide, efficiently regulates and controls the variety and proportion of the active metal iron-carbon compound of the catalyst, and further enhances the catalytic reactivity of the catalyst.

Description

technical field [0001] The invention relates to a catalyst, a preparation method and an application. More specifically, a CO 2 Iron-based catalyst, preparation method and application of hydrogenation ethanol. Background technique [0002] The excessive use of fossil fuels has led to a sharp decline in the content of fossil fuels and a sharp increase in carbon dioxide emissions, which has led to a series of problems, however carbon dioxide is an abundant, non-toxic carbon source of industrial waste gases, due to major global warming and other environmental problems , catalytic conversion of CO 2 Highly attractive for various valuable fuels and chemical feedstocks such as light olefins, carbonates, formic acid and alcohols. Among these basic raw materials, ethanol is an essential chemical product, an important solvent, an industrial building block, and a promising renewable fuel. CO directly 2 Hydrogenation to ethanol is a particularly attractive and promising route for e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J23/889B01J37/02B01J37/18C07C29/156C07C31/08
CPCB01J23/8892B01J27/22B01J37/0201B01J37/0203B01J37/18C07C29/156C07C31/08
Inventor 张燚卢方旭陈鑫
Owner BEIJING UNIV OF CHEM TECH
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