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Method for preparing cobalt-base Fischer-Tropsch synthetic catalyst

A technology for catalyst and Tropsch synthesis, which is applied in the field of preparation of Fischer-Tropsch synthesis catalysts, can solve the problems of reduced selectivity, difficulty in reduction, and shortened catalyst life, and achieves improved reaction activity and selectivity, simple preparation methods, and long service life. Effect

Inactive Publication Date: 2005-06-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the supports of the above catalysts can chemically interact with metal cobalt to form cobalt aluminate, cobalt silicate or cobalt titanate compounds that are difficult to reduce, which reduces the activity and selectivity of the catalyst and makes CH 4 The content in the reaction product increased significantly, C 5 + The selectivity is greatly reduced
When the catalyst operates in a slurry bed or in a fixed bed for a long time, the hydrothermal effect promotes the reaction of cobalt and the carrier, which greatly reduces the life of the catalyst, resulting in a high cost of catalyst per ton of oil, which restricts the Fischer-Tropsch synthesis process industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 100ml of absolute ethanol, 100ml of distilled water, and 1.2ml of glacial acetic acid into the beaker, add 100ml of tetraethyl orthosilicate (TEOS) under stirring, and let stand for 5 hours to form a gel. During the preparation process, the temperature was kept constant at 40°C, the gel was dried at 110°C, and then calcined at 200°C for 1 hour, 250°C for 1 hour, and 350°C for 5 hours to obtain a silica gel carrier. Weigh 8.5g of silica gel, add distilled water dropwise until initial moistening, and the volume of consumed water is 10ml. Add 10ml of 25% ammonia solution into the silica gel, age for 6 hours, and dry at 120°C for 24 hours. Based on the final cobalt content of the catalyst being 10 wt%, 4.7 g of cobalt nitrate was weighed to prepare a 10 ml solution, which was added to the silica gel surface-modified by aqueous ammonia, impregnated, aged for 12 hours, and roasted at 400° C. for 6 hours to obtain the catalyst. Denote it as MS1.

[0016] Catalyst evaluat...

Embodiment 2

[0018] The preparation method of silica gel is the same as in Example 1. Weigh 8.8g of silica gel, add distilled water dropwise until initial moistening, and the volume of consumed water is 11ml. 11 ml of 18% ammonia solution was added to the silica gel, aged for 48 hours, and dried at 120° C. for 8 hours. According to the final catalyst cobalt content of 5wt%, weigh 2.5g of cobalt nitrate, make 11ml solution, add the above-mentioned silica gel after surface modification by ammonia water, impregnate, age for 48 hours, and roast at 600 ° C for 2 hours to prepare the catalyst, which is recorded as MS2. The experimental conditions for catalyst activity evaluation are the same as in Example 1. The results of MS2 catalyst Fischer-Tropsch synthesis reaction are shown in Table 1.

Embodiment 3

[0020] The preparation method of silica gel is the same as in Example 1. Weigh 9g of silica gel, add distilled water dropwise until initial moistening, and the volume of consumed water is 12ml. 12ml of 12% ammonia solution was added to the silica gel, aged for 96 hours, and dried at 100°C for 150 hours. Based on the final catalyst cobalt content of 15wt%, weigh 7.5g of cobalt nitrate, make it into 12ml solution, add it to the above-mentioned silica gel after surface modification with ammonia water, impregnate it, age for 96 hours, and roast at 500°C for 3 hours to obtain the catalyst, which is recorded as MS3 . The experimental conditions for catalyst activity evaluation are the same as in Example 1. Table 1 shows the results of the MS3 catalyst Fischer-Tropsch synthesis reaction.

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Abstract

A preparation method of a cobalt-based Fischer-Tropsch synthesis catalyst is to use a sol-gel method to prepare a silica gel carrier, modify the surface of the prepared silica gel carrier with a certain concentration of ammonia solution, and then pass the active component cobalt Load onto a silicone surface. The modified cobalt-silicon catalyst is obtained by drying and calcining. The invention has the advantages that after the silica gel carrier used is modified by ammonia water, the reaction activity and selectivity of the catalyst of the invention are greatly improved, the service life is long, and the preparation method is simple.

Description

Technical field: [0001] The invention belongs to a preparation method of a Fischer-Tropsch synthesis catalyst, in particular to a preparation method of a cobalt-based Fischer-Tropsch synthesis catalyst. Background technique: [0002] With the transformation of the world's energy structure from a single oil-dependent type to a joint supply of coal, natural gas and oil; with the increasing global environmental protection requirements, the indirect coal liquefaction technology will surely develop rapidly. Since Fischer-Tropsch synthesis using natural gas and coal-based syngas as raw materials has the advantages of not relying on petroleum and clean products (free of sulfur, nitrogen, and aromatic hydrocarbons), it has attracted the attention of countries all over the world in recent years, and major companies have successively invested in it. The development of Fischer-Tropsch synthetic oil technology, and the Fischer-Tropsch synthesis process based on cobalt-based catalysts is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J37/02C07C1/00
Inventor 孙予罕赵红霞陈建刚
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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