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Co/BN catalyst for Fischer-Tropsch synthesis as well as preparation method and application of Co/BN catalyst

A Fischer-Tropsch synthesis and catalyst technology, which is used in the preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, chemical instruments and methods, etc. It can solve problems such as affecting the utilization efficiency of carbon atoms, low dispersion of active metals, and low catalyst activity. , to achieve the effects of low methane selectivity, high metal loading, and high CO conversion

Pending Publication Date: 2022-07-15
BC P INC CHINA NAT PETROLEUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After research, it was found that the surface area of ​​conventional hexagonal boron nitride used in the catalyst preparation process was small (20-80m 2 / g), the dispersion of active metals is low, which ultimately leads to low catalyst activity. The reaction temperature usually needs to be above 220 °C, and carbon dioxide will be generated at the same time, which affects the utilization efficiency of carbon atoms.

Method used

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  • Co/BN catalyst for Fischer-Tropsch synthesis as well as preparation method and application of Co/BN catalyst
  • Co/BN catalyst for Fischer-Tropsch synthesis as well as preparation method and application of Co/BN catalyst
  • Co/BN catalyst for Fischer-Tropsch synthesis as well as preparation method and application of Co/BN catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh Co(NO 3 ) 3 ·6H 2 O 118g, prepared with deionized water into a mixed salt solution with a total concentration of 0.9mol / L, adding 180g of boron nitride with two-dimensional nanosheets in the prepared nitrate solution, stirring continuously for 2h, putting in Blast drying oven, the reaction temperature is 120 ℃, and the reaction time is 10h. Then, it was left to stand for aging for 5 hours, filtered with suction, and the precipitate was repeatedly washed with deionized water. 50 mL of deionized water was added to the filter cake, followed by sonication for 10 minutes, and beating. Then, it was dried at 120°C for 10 hours, and finally calcined at 500°C for 9 hours, cooled, pressed, and crushed, and 60-80 mesh was selected as the fixed-bed Fischer-Tropsch synthesis catalyst. At 0.3MPa, 1000h -1 , at 350 ℃ for 30 hours with hydrogen reduction, and then at 180 ℃, 1.5MPa, 2000h -1 , raw gas H 2 The Fischer-Tropsch synthesis performance of the catalyst was evaluat...

Embodiment 2

[0034] Weigh Co(NO 3 ) 3 ·6H 2O 118g, prepare a mixed salt solution with a total concentration of 1.5mol / L with deionized water, add 95g of boron nitride with two-dimensional nanosheets in the prepared mixed salt solution, stir continuously for 2h, put in Blast drying oven, the reaction temperature is 90 ℃, and the reaction time is 8h. Then, it was left to stand for aging for 5 hours, filtered with suction, and the precipitate was repeatedly washed with deionized water. 50 mL of deionized water was added to the filter cake, followed by sonication for 10 minutes, and beating. The above two kinds of slurries were mixed, the slurry was dried at 120°C for 20 hours, and finally calcined at 400°C for 5 hours, cooled, pressed, formed and broken, and 60-80 mesh was selected as the fixed-bed Fischer-Tropsch synthesis catalyst. At 0.2MPa, 2000h -1 , 450 ℃ for 20 hours with hydrogen reduction, and then at 190 ℃, 2.0MPa, 1000h -1 , raw gas H 2 The Fischer-Tropsch synthesis performa...

Embodiment 3

[0036] Weigh Co(NO 3 ) 3 ·6H 2 O 64g, prepared with deionized water into a nitrate solution with a total concentration of 1.0mol / L, adding 70g of boron nitride with two-dimensional nanosheets in the prepared salt solution, stirring continuously for 2h, and putting it into a drum Air drying oven, the temperature is 100 ℃, and the drying time is 5h. The second weighing of Co(NO 3 ) 3 ·6H 2 O 64g, prepared into a nitrate solution with a total concentration of 1.0mol / L with deionized water, added the above dry material to the prepared salt solution, stirred continuously for 2h, put it into a blast drying oven, the drying temperature was 120 ℃, dried The time is 10h. Then, it was left to stand for aging for 5 hours, filtered with suction, and the precipitate was repeatedly washed with deionized water. 50 mL of deionized water was added to the filter cake, followed by sonication for 10 minutes, and beating. Finally, it was calcined at 500°C for 9 hours, cooled, pressed into ...

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Abstract

The invention discloses a Co / BN catalyst for Fischer-Tropsch synthesis and a preparation method and application thereof, the catalyst comprises a carrier and an active component, the active component is metal cobalt, and the catalyst has a two-dimensional nanosheet structure. The carrier is boron nitride (commonly known as white graphene) with a two-dimensional nanosheet structure, the weight ratio of Co to BN is (10-60): (90-40), and a metal precursor in the catalyst is nitrate. The catalyst is prepared by adopting an impregnation method; the boron nitride carrier has high thermal conductivity and thermal stability, after cobalt is loaded, the catalyst shows excellent stability, the corresponding Fischer-Tropsch synthesis CO conversion rate is high, and the heavy hydrocarbon selectivity is good.

Description

technical field [0001] The invention relates to a catalyst and its preparation method and application, in particular to a Co / BN catalyst for Fischer-Tropsch synthesis, its preparation method and application. Background technique [0002] Fischer-Tropsch synthesis refers to synthesis gas (H 2 +CO) is the process of producing hydrocarbons and other chemicals by catalytic reaction of raw materials. Iron-based catalysts are inexpensive and readily available, exhibit high Fischer-Tropsch synthesis reactivity, and exhibit high WGS reactivity, making them especially suitable for low H 2 Fischer-Tropsch synthesis of coal-based syngas at / CO ratio. In the 1950s, the catalyst used by Sasol Company, which successfully realized the large-scale industrialization of Fischer-Tropsch synthesis in South Africa, was an iron-based catalyst. Traditional iron-based catalysts use silica and alumina carriers, and many patents have been applied for various systems. For example, the WO2004047986...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J27/24C10G2/00
CPCB01J23/75B01J27/24C10G2/332
Inventor 肖海成孔繁华刘克峰刘晓彤王宗宝李庆勋王林鲁玉莹娄舒洁魏静陈建刚
Owner BC P INC CHINA NAT PETROLEUM CORP
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