Calcium oxide-based bimetallic composite material as well as preparation method and application thereof

Abstract

The invention discloses a calcium oxide-based bimetallic composite material as well as a preparation method and application thereof. The calcium oxide-based bimetallic composite material comprises anadsorption active component, a catalytic active component and a co-catalytic component; wherein the adsorption active component is CaO; the catalytic active component comprises metal iron oxide; and the co-catalysis component comprises any one or a combination of more of Co, Ni and Mn. In the aspect of component content, the mass ratio of the adsorption active component to the sum of the catalyticactive component and the co-catalytic component is 1 : 0.05-0.3, and the weight ratio of the catalytic active component to the co-catalytic component is 1 : 0.2-1. The preparation is based on a simple sol-gel one-step method, wherein the composite material of a porous structure is prepared by adding an organic template agent, it is guaranteed that the composite material has high CO2 adsorption capacity and stability, and meanwhile the composite material has high catalytic activity sites. In application, the porous calcium oxide-based bimetallic composite material can be applied to capture andconversion of CO2 in flue gas in large industrial processes such as coal-fired power plants, steel manufacturing, cement manufacturing, ethylene manufacturing and the like.

Description

technical field

[0001] The invention belongs to CO 2 The technical field of materials for capture and in-situ conversion, specifically relates to a CO 2 A calcium oxide-based bimetallic composite material with dual functions of trapping and in-situ conversion, its preparation method and its application. Background technique

[0002] With the increasing demand for natural gas and various chemical fuels, CO 2 The ecological climate change caused by the greenhouse effect caused by excessive emissions threatens the survival of human beings. At this stage, the most promising one is CO 2 Capture and storage technology (CCS), CO capture and storage by chemical absorption or adsorption 2 Captured, then stored, transported by pipeline, and sealed up underground or on the seabed. However, this technology has been questioned due to its high cost and potential safety and environmental risks. Therefore, if carbon capture is closely linked to carbon resources, the captured CO 2 It ...

Examples

Embodiment 1

[0045] Weigh 8.433gCa(NO 3 ) 2 4H 2 O is dissolved in 40mL of deionized water to obtain a solution, after stirring evenly, add organic template agent 6.5gC 6 h 8 o 7 ·H 2 O and 1.0g cetyltrimethylammonium bromide, continue to stir until fully dissolved, continue to add 0.72gFe(NO 3 ) 2 9H 2 O and 0.49gCo(NO 3 ) 2 ·6H 2 O, stir evenly to obtain a mixed solution. Stir the mixed solution in a constant temperature water bath at 90°C for 5 hours to obtain a translucent gel, cool to room temperature, place the gel in an oven at 120°C, heat and dry for 12 hours to obtain a xerogel. Finally, the dry gel was calcined at 800°C for 4 hours, then ground, pressed into tablets, and crushed to obtain a composite material Fe with a particle size of 0.2-0.3 mm. 5 co 5 CaO, the mass ratio of CaO:FeCo metal oxide (calculated according to the metal salt precursor) in the composite material is 1:0.1, wherein Fe%:Co%=1:1.

[0046] The prepared adsorption-catalysis bifunctional composi...

Embodiment 2

[0051] Weigh 5.24gCaCl 2 2H 2 O was dissolved in 40mL of deionized water to obtain a solution. After stirring evenly, 10g of organic template agent P123 was added, and the stirring was continued until it was fully dissolved, and 0.97g of Fe(NO 3 ) 2 9H 2 O and 0.32gCo(NO 3 ) 2 ·6H 2 O, stir evenly to obtain a mixed solution. The mixed solution was stirred in a constant temperature water bath at 80°C for 5 hours to obtain a translucent gel, cooled to room temperature, placed in an oven at 120°C, heated and dried for 14 hours to obtain a xerogel. Finally, the dry gel was calcined at 800°C for 5 hours, then ground, pressed into tablets, and crushed to obtain a composite material Fe with a particle size of 0.2-0.3 mm. 10 co 5 CaO, the mass ratio of CaO:FeCo metal oxide in the composite material is 1:0.15, wherein Fe%:Co%=2:1.

[0052] Using the same analytical method as in Example 1, the results show that the prepared adsorption-catalysis dual-functional porous composite ...

Embodiment 3

[0054] Weigh 8.43gCa(NO 3 ) 2 4H 2 O was dissolved in 40mL of deionized water to obtain a solution. After stirring evenly, 5g of organic templating agent hexadecyltrimethylammonium bromide and 10g of ammonium oxalate were added, and stirring was continued until fully dissolved, and 0.47g of Fe(NO 3 ) 2 9H 2 O and 0.22gCo(NO 3 ) 2 ·6H 2 O, stir evenly to obtain a mixed solution. Stir the mixed solution in a constant temperature water bath at 100°C for 6 hours to obtain a translucent gel, cool to room temperature, put the gel in an oven at 130°C, heat and dry for 16 hours to obtain a xerogel. Finally, the dry gel was calcined at 900°C for 4 hours, then ground, pressed into tablets, and crushed to obtain a composite material Fe with a particle size of 0.2-0.3 mm. 3 co 2 CaO, the mass ratio of CaO:FeCo metal oxide in the composite material is 1:0.05, wherein Fe%:Co%=3:2.

[0055] Using the same analytical method as in Example 1, the results show that the prepared adsorpt...

technical field

[0001] The invention belongs to CO 2 The technical field of materials for capture and in-situ conversion, specifically relates to a CO 2 A calcium oxide-based bimetallic composite material with dual functions of trapping and in-situ conversion, its preparation method and its application. Background technique

[0002] With the increasing demand for natural gas and various chemical fuels, CO 2 The ecological climate change caused by the greenhouse effect caused by excessive emissions threatens the survival of human beings. At this stage, the most promising one is CO 2 Capture and storage technology (CCS), CO capture and storage by chemical absorption or adsorption 2 Captured, then stored, transported by pipeline, and sealed up underground or on the seabed. However, this technology has been questioned due to its high cost and potential safety and environmental risks. Therefore, if carbon capture is closely linked to carbon resources, the captured CO 2 It ...

Examples

Embodiment 1

[0045] Weigh 8.433gCa(NO 3 ) 2 4H 2 O is dissolved in 40mL of deionized water to obtain a solution, after stirring evenly, add organic template agent 6.5gC 6 h 8 o 7 ·H 2 O and 1.0g cetyltrimethylammonium bromide, continue to stir until fully dissolved, continue to add 0.72gFe(NO 3 ) 2 9H 2 O and 0.49gCo(NO 3 ) 2 ·6H 2 O, stir evenly to obtain a mixed solution. Stir the mixed solution in a constant temperature water bath at 90°C for 5 hours to obtain a translucent gel, cool to room temperature, place the gel in an oven at 120°C, heat and dry for 12 hours to obtain a xerogel. Finally, the dry gel was calcined at 800°C for 4 hours, then ground, pressed into tablets, and crushed to obtain a composite material Fe with a particle size of 0.2-0.3 mm. 5 co 5 CaO, the mass ratio of CaO:FeCo metal oxide (calculated according to the metal salt precursor) in the composite material is 1:0.1, wherein Fe%:Co%=1:1.

[0046] The prepared adsorption-catalysis bifunctional composi...

Embodiment 2

[0051] Weigh 5.24gCaCl 2 2H 2 O was dissolved in 40mL of deionized water to obtain a solution. After stirring evenly, 10g of organic template agent P123 was added, and the stirring was continued until it was fully dissolved, and 0.97g of Fe(NO 3 ) 2 9H 2 O and 0.32gCo(NO 3 ) 2 ·6H 2 O, stir evenly to obtain a mixed solution. The mixed solution was stirred in a constant temperature water bath at 80°C for 5 hours to obtain a translucent gel, cooled to room temperature, placed in an oven at 120°C, heated and dried for 14 hours to obtain a xerogel. Finally, the dry gel was calcined at 800°C for 5 hours, then ground, pressed into tablets, and crushed to obtain a composite material Fe with a particle size of 0.2-0.3 mm. 10 co 5 CaO, the mass ratio of CaO:FeCo metal oxide in the composite material is 1:0.15, wherein Fe%:Co%=2:1.

[0052] Using the same analytical method as in Example 1, the results show that the prepared adsorption-catalysis dual-functional porous composite ...

Embodiment 3

[0054] Weigh 8.43gCa(NO 3 ) 2 4H 2 O was dissolved in 40mL of deionized water to obtain a solution. After stirring evenly, 5g of organic templating agent hexadecyltrimethylammonium bromide and 10g of ammonium oxalate were added, and stirring was continued until fully dissolved, and 0.47g of Fe(NO 3 ) 2 9H 2 O and 0.22gCo(NO 3 ) 2 ·6H 2 O, stir evenly to obtain a mixed solution. Stir the mixed solution in a constant temperature water bath at 100°C for 6 hours to obtain a translucent gel, cool to room temperature, put the gel in an oven at 130°C, heat and dry for 16 hours to obtain a xerogel. Finally, the dry gel was calcined at 900°C for 4 hours, then ground, pressed into tablets, and crushed to obtain a composite material Fe with a particle size of 0.2-0.3 mm. 3 co 2 CaO, the mass ratio of CaO:FeCo metal oxide in the composite material is 1:0.05, wherein Fe%:Co%=3:2.

[0055] Using the same analytical method as in Example 1, the results show that the prepared adsorpt...

Images