Fischer Tropsch synthesis catalyst for preparing heavy hydrocarbon product through synthesis gas and preparation method of catalyst

A Fischer-Tropsch synthesis and catalyst technology, applied in the field of preparation of Fischer-Tropsch synthesis catalysts, can solve the problems of limited diffusion of reactants and products, low selectivity of heavy hydrocarbons, and high selectivity of methane, and achieve good selectivity of heavy hydrocarbons , the effect of low methane selectivity and high reactivity

Active Publication Date: 2016-07-06
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the purpose of the catalyst provided by the present invention is to overcome the deficiencies such as easy deactivation of Fischer-Tropsch synthesis catalysts in the prior art, high selectivity of methane, low selectivity of heavy hydrocarbons, limited diffusion of reactants and products, and provide an active Fischer-Tropsch synthesis catalyst with good dispersibility, good diffusion effect, high activity and heavy hydrocarbon selectivity, low methane selectivity, and long life of metal cobalt particles

Method used

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  • Fischer Tropsch synthesis catalyst for preparing heavy hydrocarbon product through synthesis gas and preparation method of catalyst
  • Fischer Tropsch synthesis catalyst for preparing heavy hydrocarbon product through synthesis gas and preparation method of catalyst
  • Fischer Tropsch synthesis catalyst for preparing heavy hydrocarbon product through synthesis gas and preparation method of catalyst

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Embodiment 1

[0050] A Fischer-Tropsch synthesis cobalt-based catalyst for producing heavy hydrocarbon products from synthesis gas, the steps of its preparation method are as follows:

[0051] (1) Preparation of mesoporous nano-silica spheres:

[0052] Add 4.59g of cetyltrimethylammonium bromide and 0.45g of diethanolamine into a three-necked flask filled with 238mL of distilled water, and stir at 40°C for 1 hour; then add 34.67g of tetraethylorthosilicate and continue stirring 2h; after the end, filter and wash, then dry at 120°C for 12h, and finally bake at 550°C for 6h to obtain white powdery mesoporous nano-silica beads, marked as Z1.

[0053] It is measured that the particle diameter of the mesoporous nano-silica sphere Z1 is 20-50 nm.

[0054] (2) Preparation of catalyst:

[0055] 2.74gCo(NO 3 ) 2 ·6H 2 O was dissolved in 27.4mL of water, then 2.74mL of ammonia water (7mol / L) was added under stirring, and after stirring for 20min, the resulting suspension was transferred to a 100...

Embodiment 2

[0063] A Fischer-Tropsch synthesis cobalt-based catalyst for producing heavy hydrocarbon products from synthesis gas, the steps of its preparation method are as follows:

[0064] (1) Preparation of mesoporous nano-silica spheres:

[0065] With embodiment 1.

[0066] (2) Preparation of catalyst:

[0067] 4.36gCo(NO 3 ) 2 ·6H 2 O was dissolved in 43.60mL of water, and then 4.36mL of ammonia water (7mol / L) was added under stirring. After stirring for 20min, the obtained suspension was transferred to a 100mL autoclave, and the mesoporous nano 5.0g of silica pellets, kept at 160°C for 5h, cooled to room temperature, dried by rotary evaporation and then washed, then dried at 120°C for 12h and calcined at 350°C for 4h to obtain cobalt-based catalyst S2: 15Co / SiO 2 , wherein 15 represents that the weight percent content of cobalt element in the catalyst is 15%.

[0068] From the transmission electron microscope image ( figure 1 ), it can be seen that the diameter of the mesopor...

Embodiment 3

[0072] A Fischer-Tropsch synthesis cobalt-based catalyst for producing heavy hydrocarbon products from synthesis gas, the steps of its preparation method are as follows:

[0073] (1) Preparation of mesoporous nano-silica spheres:

[0074] With embodiment 1.

[0075] (2) Preparation of catalyst:

[0076] 10.58gCo(NO 3 ) 2 ·6H 2 O was dissolved in 105.80mL of water, then 10.58mL of ammonia water (7mol / L) was added under stirring, and after stirring for 20min, the resulting suspension was transferred to a 100mL autoclave, and the mesoporous nano 5.0g of silica pellets, kept at 160°C for 5h, cooled to room temperature, dried by rotary evaporation, then dried at 120°C for 12h and calcined at 350°C for 4h to obtain the cobalt-based catalyst S3: 30Co / SiO 2 , wherein 30 means that the weight percent content of cobalt element in the catalyst S3 is 30%.

[0077] After testing, there are mesoporous pores with a diameter ranging from 2 to 5 nm on the mesoporous nano-silica spheres i...

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Abstract

The invention belongs to the technical field of preparation of Fischer Tropsch synthesis catalysts, and particularly discloses a Fischer Tropsch synthesis catalyst for preparing a heavy hydrocarbon product through synthesis gas and a preparation method of the catalyst.The method includes the steps of preparing nanometer silicon dioxide spheres of a mesoporous structure, wherein the granularity of the spheres is 20-50 nm; adding the nanometer silicon dioxide spheres when cobaltosic oxide particles are prepared to obtain a cobalt-based catalyst, wherein the specific surface area of the catalyst reaches up to 762.1 m<2>.g<-1>, the pore capacity reaches 1.81 cm<3>.g<-1>, dual-pore pore size distribution is achieved, and cobaltosic oxide particles are uniform in size and high in dispersity and evenly dispersed among the nanometer silicon dioxide spheres.The catalyst is beneficial to dispersion of reactants and products when used for Fischer Tropsch synthesis reaction and has high activity and stability, low methane selectivity and high heavy hydrocarbon selectivity, and the heavy hydrocarbon selectivity reaches up to 85.5% or above.

Description

technical field [0001] The invention relates to the technical field of preparation of Fischer-Tropsch synthesis catalysts, in particular to a Fischer-Tropsch synthesis catalyst for producing heavy hydrocarbon products from synthesis gas and a preparation method thereof. Background technique [0002] Syngas (H 2 +CO) can be converted into hydrocarbon products under certain conditions through catalysts, and this technology is called Fischer-Tropsch synthesis technology. Heavy hydrocarbon products from Fischer-Tropsch synthesis, including gasoline (C 5 -C 12 ), diesel (C 13 -C 20 ) and wax (C 20+ ) etc., wherein the wax is purified and refined to obtain a Fischer-Tropsch synthetic wax with a carbon number distribution greater than 20 and substantially no branching. Fischer-Tropsch synthetic wax has received widespread attention due to its excellent properties such as good wear resistance, slipperiness, low melt viscosity, low mobility and high melting point. It is mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/10C10G2/00
CPCB01J21/08B01J23/75B01J35/1023B01J35/1047C10G2/332C10G2300/70
Inventor 李金林韦良刘成超张煜华赵燕熹
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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