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Preparation method of environment-friendly cobalt-based catalyst for Fischer Tropsch synthesis

A catalyst and cobalt-based FE technology, which is applied in the field of preparation of environment-friendly cobalt-based Fischer-Tropsch synthesis catalysts, can solve the problems of unconverted raw gas that needs to be recycled, low total conversion rate, low selectivity, etc., and saves equipment investment. and operating costs, saving cycle operations, and improving the effect of economy

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN1981927A discloses a catalyst prepared by mixing and roasting cobalt-aluminum spinel and alumina or alumina precursors. In a reactor at 220° C., 2.5 MPa and a synthesis gas flow rate of 100 ml / min, the catalyst’s total Conversion rate (CO+H 2 ) is 54.5%, C 5 + Selectivity is 87.2%, CO 2 Selectivity is 1.86%, CH 4 The selectivity is 5.74%, although the catalyst has a lower CO 2 and CH 4 selectivity, but the total conversion rate is not high, a large amount of unconverted feed gas needs to be recycled, and the reaction effect is low
In this technology, the conversion rate of raw materials has been improved, but C 5 + The selectivity is not high, and the methane yield of this technology is relatively high, and the selectivity of the target product still needs to be further improved

Method used

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  • Preparation method of environment-friendly cobalt-based catalyst for Fischer Tropsch synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Weigh commercially available silica gel (pore volume is 1.06ml / g, specific surface area is 386.81m 2 / g, the following examples all use this silica gel) 30g, carry out de-sodium treatment, and the operation method and conditions of de-sodium treatment are: at room temperature, first wash with nitric acid or ammonium nitrate solution, and then repeatedly wash with distilled water, and the silica gel after de-sodium is required. The sodium content is less than 500μg / g.

[0019] (2) The silica gel after the de-sodium treatment is subjected to alkali modification treatment. The treatment method and conditions are as follows: 50 ml of 5% ammonium carbonate solution by weight is added to the silica gel at 50° C. and treated for 10 hours. It was dried at 60°C for 24 hours and then calcined at 280°C for 15 hours.

[0020] (3) The silica gel after alkali treatment is impregnated with active components and auxiliary agents. According to the catalyst zirconium content of 1 wt...

Embodiment 2

[0046] (1) Weigh commercially available silica gel (pore volume is 1.06ml / g, specific surface area is 386.81m 2 / g) 30g, carry out de-sodium treatment, the operation method and conditions of de-sodium treatment are: at room temperature, first wash with nitric acid or ammonium nitrate solution, and then repeatedly wash with distilled water, the sodium content in the silica gel after de-sodium is required to be less than 500 μg / g .

[0047] (2) The silica gel after the de-sodium treatment is subjected to alkali modification treatment. The treatment method and conditions are as follows: 50 ml of 5% ammonium carbonate solution by weight is added to the silica gel at 50° C. and treated for 10 hours. It was dried at 60°C for 24 hours and then calcined at 280°C for 15 hours.

[0048] (3) The silica gel after alkali treatment is impregnated with active components and additives. First, according to the catalyst cobalt content of 10 wt%, 10.49 g of cobalt nitrate is weighed and dissolv...

Embodiment 3

[0052] (1) Weigh commercially available silica gel (pore volume is 1.06ml / g, specific surface area is 386.81m 2 / g) 30g, carry out de-sodium treatment, the operation method and conditions of de-sodium treatment are: at room temperature, first wash with nitric acid or ammonium nitrate solution, and then repeatedly wash with distilled water, the sodium content in the silica gel after de-sodium is required to be less than 500 μg / g .

[0053] (2) The silica gel after the de-sodium treatment is subjected to alkali modification treatment. The treatment method and conditions are as follows: 50 ml of 5% ammonium carbonate solution by weight is added to the silica gel at 50° C. and treated for 10 hours. It was dried at 60°C for 24 hours and then calcined at 280°C for 15 hours.

[0054] (3) The silica gel after alkali treatment is impregnated with active components and additives. First, according to the catalyst cobalt content of 10 wt%, 10.49 g of cobalt nitrate is weighed and dissolv...

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Abstract

The invention discloses a preparation method of an environment-friendly cobalt-based catalyst for Fischer Tropsch synthesis. The preparation method comprises the step of: with modified silicon gel as a carrier, loading active components Co and Ni by adopting two times of immersion methods, a cobalt salt solution is adopted for immersion in the first time of immersion, the pH of the cobalt salt solution is 3-5, a cobalt salt and nickel salt mixed solution is adopted for immersion in the second time of immersion, and the pH of a cobalt salt and nickel salt immersion solution is below 3. When the cobalt-based catalyst for Fischer Tropsch synthesis, prepared by adopting the preparation method, is used in a Fischer Tropsch synthesis reaction, higher transformation rate and C<5+> product selectivity are kept, and lower carbon dioxide and methane selectivity is obtained.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly cobalt-based Fischer-Tropsch synthesis catalyst, in particular to a preparation method of a high-activity cobalt-based Fischer-Tropsch synthesis catalyst generated with low carbon dioxide and methane using modified silica gel as a carrier. Background technique [0002] Fischer-Tropsch synthesis refers to the reaction in which synthesis gas (carbon monoxide and hydrogen) catalyzes the synthesis of hydrocarbon liquid fuels on catalysts. Because Fischer-Tropsch synthesis has the advantages of not relying on oil, clean products, etc., and with the transformation of the world's energy structure from a single oil-dependent type to a coal, oil and natural gas co-supply type, and with the increasing environmental protection requirements, the Fischer-Tropsch synthesis technology will be rapidly improved. develop. [0003] Efficient cobalt-based Fischer-Tropsch catalyst is one of the key t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J37/02C10G2/00
Inventor 倪向前张舒冬张喜文李杰陈楠梁皓
Owner CHINA PETROLEUM & CHEM CORP