Catalyst for co-production of low carbon alkenes from carbon dioxide hydrogenation to gasoline and preparation method of catalyst

Abstract

The invention discloses a catalyst for co-production of low carbon alkenes from carbon dioxide hydrogenation to gasoline and a preparation method of the catalyst. The catalyst takes gamma-Al2O3 as a carrier, the carrier is doped with three elements of Fe, Co and Na, and according to the weight of the carrier, the contents of the Fe, the Co and the Na are respectively 8.3wt.%, 1.7wt.% and 1.8-7.4 wt.%. The catalyst for the co-production of the low carbon alkenes from the carbon dioxide hydrogenation to the gasoline and the preparation method of the catalyst have the advantages that (1) selectivity of a by-product which is carbon monoxide can be greatly reduced by doping cobalt in an iron-base catalyst, the iron cobalt bimetallic metal has high selectivity of low-carbon olefin and gasoline distillate hydrocarbon under promotion of sodium, so while the FeCoNa / gamma-Al2O3 catalyst catalyzes the carbon dioxide hydrogenation to produce a gasoline cleaning product, the enane ratio of low-carbon hydrocarbons is greatly increased, and selectivity of methane and the carbon monoxide which are not ideal products is successfully inhibited; (2) the FeCoNa / gamma-Al2O3 catalyst has a high conversion rate of CO2; and (3) the space velocity of the reaction CO2 of the carbon dioxide hydrogenation catalyzed by the FeCoNa / gamma-Al2O3 catalyst is high.

Description

technical field

[0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for the co-production of low-carbon olefins by hydrogenation of carbon dioxide to gasoline and the preparation method thereof, belonging to the technical field of catalysts. Background technique

[0002] For centuries, the rapid development of human society has been accompanied by the massive consumption of fossil resources, and the acceleration of industrialization has produced a large amount of CO2. The continuous increase of CO2 concentration in the atmosphere has increased the pressure on the environment, leading to a series of ecological problems, such as global warming, melting glaciers, ocean acidification, etc., which are threatening our living environment. Therefore, CO2 emission reduction is a global challenge. Utilizing CO2 as a resource and converting it into high value-added hydrocarbons can not only reduce the content of CO2 in the atmospher...

Examples

Embodiment 1

[0024] Example 1: Preparation of 8.3wt.% Fe1.7wt.% Co / γ-Al 2 o 3 catalyst

[0025] Weigh 4.42mmolFe(NO 3 ) 3 9H 2 O and 0.93mmolCo(NO 3 ) 2 ·6H 2 O was added to 3g of deionized water, ultrasonicated to form a homogeneous solution, and then 3g of γ-Al was weighed 2 o 3 (Carrier) was added to the above solution and kept stirring to make γ-Al 2 o 3 Mix well with the complexing solution, put the stirred solution in an oven and dry overnight at 80°C, then take out the solid, grind the solid with an agate mortar, and finally put the ground solid in a muffle furnace Calcined at 500°C for 4h, the catalyst obtained at this time is recorded as 8.3wt.%Fe1.7wt.%Co / γ-Al 2 o 3 . The contents of Fe and Co are based on the carrier (γ-Al 2 o 3 ) weight calculation.

Embodiment 2

[0026] Embodiment 2: Prepare 8.3wt.% Fe1.7%wt.Co1.8wt.%Na / γ-Al 2 o 3 Catalyst weighs 4.42mmolFe (NO 3 ) 3 9H 2 O, 0.93mmolCo(NO 3 ) 2 ·6H 2 O and 1.21 mmol EDTA2Na 2H 2 O was added to 4 g of deionized water, and ultrasonically formed a uniform complexation solution without precipitation under heating conditions at 50 °C, and then weighed 3 g of γ-Al 2 o 3 (Carrier) is added to the above complex solution and stirred continuously to make γ-Al 2 o 3 Mix well with the complexing solution, put the stirred solution in an oven and dry overnight at 80°C, then take out the solid, grind the solid with an agate mortar, and finally put the ground solid in a muffle furnace Calcined at 500°C for 4h, the catalyst obtained at this time was recorded as 8.3wt.%Fe1.7wt.%Co1.8wt.%Na / γ-Al 2 o 3 . The contents of Fe, Co and Na are all determined according to the carrier (γ-Al 2 o 3 ) weight calculation, the same below.

Embodiment 3

[0027] Example 3: Preparation of 8.3wt.% Fe1.7wt.% Co3.7wt.% Na / γ-Al 2 o 3 catalyst

[0028] Weigh 4.42mmolFe(NO 3 ) 3 9H 2 O, 0.93mmolCo(NO 3 ) 2 ·6H 2 O and 2.41 mmol EDTA2Na 2H 2 O was added to 4 g of deionized water, and ultrasonically formed a uniform complexation solution without precipitation under heating conditions at 50 °C, and then weighed 3 g of γ-Al 2 o 3 (Carrier) is added to the above complex solution and stirred continuously to make γ-Al 2 o 3 Mix well with the complexing solution, put the stirred solution in an oven and dry overnight at 80°C, then take out the solid, grind the solid with an agate mortar, and finally put the ground solid in a muffle furnace Calcined at 500°C for 4h, the catalyst obtained at this time was recorded as 8.3wt.%Fe1.7wt.%Co3.7wt.%Na / γ-Al 2 o 3 .

technical field

[0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for the co-production of low-carbon olefins by hydrogenation of carbon dioxide to gasoline and the preparation method thereof, belonging to the technical field of catalysts. Background technique

[0002] For centuries, the rapid development of human society has been accompanied by the massive consumption of fossil resources, and the acceleration of industrialization has produced a large amount of CO2. The continuous increase of CO2 concentration in the atmosphere has increased the pressure on the environment, leading to a series of ecological problems, such as global warming, melting glaciers, ocean acidification, etc., which are threatening our living environment. Therefore, CO2 emission reduction is a global challenge. Utilizing CO2 as a resource and converting it into high value-added hydrocarbons can not only reduce the content of CO2 in the atmospher...

Examples

Embodiment 1

[0024] Example 1: Preparation of 8.3wt.% Fe1.7wt.% Co / γ-Al 2 o 3 catalyst

[0025] Weigh 4.42mmolFe(NO 3 ) 3 9H 2 O and 0.93mmolCo(NO 3 ) 2 ·6H 2 O was added to 3g of deionized water, ultrasonicated to form a homogeneous solution, and then 3g of γ-Al was weighed 2 o 3 (Carrier) was added to the above solution and kept stirring to make γ-Al 2 o 3 Mix well with the complexing solution, put the stirred solution in an oven and dry overnight at 80°C, then take out the solid, grind the solid with an agate mortar, and finally put the ground solid in a muffle furnace Calcined at 500°C for 4h, the catalyst obtained at this time is recorded as 8.3wt.%Fe1.7wt.%Co / γ-Al 2 o 3 . The contents of Fe and Co are based on the carrier (γ-Al 2 o 3 ) weight calculation.

Embodiment 2

[0026] Embodiment 2: Prepare 8.3wt.% Fe1.7%wt.Co1.8wt.%Na / γ-Al 2 o 3 Catalyst weighs 4.42mmolFe (NO 3 ) 3 9H 2 O, 0.93mmolCo(NO 3 ) 2 ·6H 2 O and 1.21 mmol EDTA2Na 2H 2 O was added to 4 g of deionized water, and ultrasonically formed a uniform complexation solution without precipitation under heating conditions at 50 °C, and then weighed 3 g of γ-Al 2 o 3 (Carrier) is added to the above complex solution and stirred continuously to make γ-Al 2 o 3 Mix well with the complexing solution, put the stirred solution in an oven and dry overnight at 80°C, then take out the solid, grind the solid with an agate mortar, and finally put the ground solid in a muffle furnace Calcined at 500°C for 4h, the catalyst obtained at this time was recorded as 8.3wt.%Fe1.7wt.%Co1.8wt.%Na / γ-Al 2 o 3 . The contents of Fe, Co and Na are all determined according to the carrier (γ-Al 2 o 3 ) weight calculation, the same below.

Embodiment 3

[0027] Example 3: Preparation of 8.3wt.% Fe1.7wt.% Co3.7wt.% Na / γ-Al 2 o 3 catalyst

[0028] Weigh 4.42mmolFe(NO 3 ) 3 9H 2 O, 0.93mmolCo(NO 3 ) 2 ·6H 2 O and 2.41 mmol EDTA2Na 2H 2 O was added to 4 g of deionized water, and ultrasonically formed a uniform complexation solution without precipitation under heating conditions at 50 °C, and then weighed 3 g of γ-Al 2 o 3 (Carrier) is added to the above complex solution and stirred continuously to make γ-Al 2 o 3 Mix well with the complexing solution, put the stirred solution in an oven and dry overnight at 80°C, then take out the solid, grind the solid with an agate mortar, and finally put the ground solid in a muffle furnace Calcined at 500°C for 4h, the catalyst obtained at this time was recorded as 8.3wt.%Fe1.7wt.%Co3.7wt.%Na / γ-Al 2 o 3 .

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