A Fe-based catalyst with higher CO hydrogenation reaction activity and low olefin yield and its application

A low-carbon olefin and catalyst technology, which is applied in the field of CO catalytic hydrogenation to achieve the effects of easy preparation, enhanced adsorption and dissociation ability, and low cost

Active Publication Date: 2018-10-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional process, the catalytic cracking of naphtha and the dehydrogenation of alkanes are mainly used to prepare light olefins, but these two methods also have great defects due to environmental and economic factors.

Method used

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  • A Fe-based catalyst with higher CO hydrogenation reaction activity and low olefin yield and its application
  • A Fe-based catalyst with higher CO hydrogenation reaction activity and low olefin yield and its application
  • A Fe-based catalyst with higher CO hydrogenation reaction activity and low olefin yield and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step A: take by weighing 8.5467g Mg (NO 3) 2 ·6H 2 O, 1.2504g Al(NO 3 ) 3 9H 2 O, 5.3867g Fe(NO 3 ) 3 9H 2 O was put into a beaker and dissolved in 250mL deionized water; another 3.533g Na 2 CO 3 and 3.2g NaOH were put into another beaker, and 250mL deionized water was also added for dissolution. The two solutions were slowly dropped into a 1000ml four-neck flask at the same time, and the pH of the solution was strictly controlled to keep it constant at 9.5. Then the temperature was raised to 95° C. and kept for 20 hours for crystallization. After suction filtration, washing, drying and grinding, MgAlFe-CO can be obtained 3 2- - LDHs samples.

[0028] Step B: Take the partially ground MgAlFe-CO 3 2- - LDHs powder is put into the porcelain boat, and then it is placed near the thermocouple of the tube resistance furnace, and then the inside of the tube is evacuated. After observing that the pressure in the tube does not change, the H 2 to return to normal...

Embodiment 2

[0031] Step A: take by weighing 8.5467g Mg (NO 3 ) 2 ·6H 2 O, 1.2504g Al(NO 3 ) 3 9H 2 O, 5.3867g Fe(NO 3 ) 3 9H 2 O was put into a beaker and dissolved in 250mL deionized water; another 3.533g Na 2 CO 3 and 3.2g NaOH were put into another beaker, and 250mL deionized water was also added for dissolution. The two solutions were slowly dropped into a 1000ml four-neck flask at the same time, and the pH of the solution was strictly controlled to keep it constant at 9.5. Then the temperature was raised to 95° C. and kept for 20 hours for crystallization. After suction filtration, washing, drying and grinding, MgAlFe-CO can be obtained 3 2- - LDHs samples.

[0032] Step B: Take the partially ground MgAlFe-CO 3 2- - LDHs powder is put into the porcelain boat, and then it is placed near the thermocouple of the tube resistance furnace, and then the inside of the tube is evacuated. After observing that the pressure in the tube does not change, the H 2 to return to norma...

Embodiment 3

[0035] Step A: take by weighing 8.5467g Mg (NO 3 ) 2 ·6H 2 O, 1.2504g Al(NO 3 ) 3 9H 2 O, 5.3867g Fe(NO 3 ) 3 9H 2 O was put into a beaker and dissolved in 250mL deionized water; another 3.533g Na 2 CO 3 and 3.2g NaOH were put into another beaker, and 250mL deionized water was also added for dissolution. The two solutions were slowly dropped into a 1000ml four-neck flask at the same time, and the pH of the solution was strictly controlled to keep it constant at 9.5. Then the temperature was raised to 95° C. and kept for 20 hours for crystallization. After suction filtration, washing, drying and grinding, MgAlFe-CO can be obtained 3 2- - LDHs samples.

[0036] Step B: Take the partially ground MgAlFe-CO 3 2- - LDHs powder is put into the porcelain boat, and then it is placed near the thermocouple of the tube resistance furnace, and then the inside of the tube is evacuated. After observing that the pressure in the tube does not change, the H 2 to return to norma...

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Abstract

The invention provides a Fe-based catalyst having high CO hydrogenation reaction activity and low carbon olefin yield and application and belongs to the technical field of CO catalytic hydrogenation. The Fe-based catalyst contains an active center Fe uniform in particle size and an inert carrier MgAl spinel. The Fe-based catalyst is prepared after reduction of a hydrotalcite precursor MgAlFe-CO32-LDHs. The obtained Fe-based catalyst catalyzes CO hydrogenation under the reaction conditions of T = 340 DEG C and P = 2.0 MPato prepare low-carbon olefin, and the achievable optimal catalytic properties are as follows: after the catalytic performance is stable, the reactivity can be up to 2.92 mol / gFe h(the amount of converted CO substance on per gram of Fe per unit time), the CO conversion rate can be up to 89.2%, meanwhile the selectivity of the low-carbon olefin in a product can be up to 26.4%, and the yield of the low-carbon olefin can be up to 23.5%.

Description

technical field [0001] The invention provides a catalyst with high reactivity and yield of low-carbon olefins in the process of CO hydrogenation to prepare low-carbon olefins, and specifically relates to an Fe-based catalyst with a large particle size and a relatively uniform distribution, which belongs to CO catalysis Hydrogenation technology field. Background technique [0002] Low-carbon olefins can be used as raw materials for the preparation of polymers, coatings, cosmetics, solvents and other substances, and their demand is increasing year by year. In the traditional process, the catalytic cracking of naphtha and the dehydrogenation of alkanes are mainly used to prepare light olefins, but these two methods also have great defects due to environmental and economic factors. Therefore, it is of great significance to design an efficient route for preparing light olefins. [0003] At present, the problem of energy crisis has become very prominent, and the storage of non-r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745C07C1/04C07C11/02
CPCB01J23/005B01J23/745B01J35/006B01J35/0093C07C1/044C07C2523/745C07C11/02
Inventor 何静刘阳安哲宁珣
Owner BEIJING UNIV OF CHEM TECH
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